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苯丙胺

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維基百科，自由的百科全書
維基百科中的醫學內容僅供參考，並不能視作專業意見。如需獲取醫療幫助或意見，請諮詢專業人士。詳見醫學聲明。
  「安非他命」重新導向至此。關於其他用法，請見「安非他命 (消歧義)」。
  此條目介紹的是中文通稱「苯丙胺」的管制藥物1-苯基丙-2-胺。關於ACD軟件索引名（ACD/Index Name）為「苯丙胺」（Benzenepropanamine）的化合物3-苯基丙-1-胺（C₆H₅CH₂CH₂CH₂NH₂），請見「3-苯丙胺」。
  「苯異丙胺」重新導向至此。關於其他用法，請見「苯異丙胺 (消歧義)」。
  關於中樞神經興奮劑，請見中樞神經刺激劑、哌甲酯以及注意力不足過動症#藥物。
安非他命（Amfetamine） (藥名)
An image of the amphetamine compound
A 3d image of the D-amphetamine compound
臨床資料
讀音聆聽i/æmˈfɛtəmiːn/
其他名稱α-甲基苯乙胺
AHFS/Drugs.comamphetamine
依賴性生理依賴: 無
心理依賴: 中等
成癮性中等
給藥途徑醫用：口服給藥、鼻腔給藥、靜脈注射[1]
非醫療用（Recreational）： 口服給藥、鼻腔給藥, 吹入劑（英語：Insufflation (medicine)）、栓劑、靜脈注射
ATC碼
法律規範狀態
法律規範
藥物動力學數據
生物利用度口服 75–100%[2]
血漿蛋白結合率15–40%[3]
藥物代謝Amphetamine only:
CYP2D6,[4]Dopamine β-hydroxylase,[14][15][16]含黃素的單加氧酶（英語：Flavin-containing monooxygenas）[14][17][18]
代謝產物4-hydroxyamphetamine（英語：4-hydroxyamphetamine）, 4-hydroxynorephedrine（英語：4-hydroxynorephedrine）, 4-羥基苯基丙酮, 苯甲酸, 馬尿酸, 苯丙醇胺, 苯基丙酮[4][5][6]
藥效起始時間（英語：Onset of action）短效型（IR 立即釋放藥物）
使用後（dosing）：30–60&nbsp；分鐘內[7]
長效型 （XR 緩緩釋放藥物）
使用後（dosing）：1.5–2&nbsp；小時內[8][9][10]
生物半衰期D-amph：9–11&nbsp；小時[4][11]
L-amph：11–14&nbsp；小時[4][11]
視PH值而定：8–31&nbsp；小時[12]
作用時間短效型（IR 立即釋放藥物）
使用後（dosing）：3–7 小時內[8][13]
長效型（XR 緩緩釋放藥物）
使用後(dosing): 12&nbsp；小時內[8][10][13]
排泄途徑主要透過腎臟;
視PH值而定 範圍：1–75%[4]
識別資訊
  • (RS)-1-phenylpropan-2-amine
    (RS)-1-苯基丙-2-胺
CAS號300-62-9  checkY
PubChem CID
IUPHAR/BPS
DrugBank
ChemSpider
UNII
KEGG
ChEBI
ChEMBL
NIAID ChemDB
PDB配體ID
CompTox Dashboard（英語：CompTox Chemicals Dashboard） (EPA)
ECHA InfoCard100.005.543 編輯維基數據鏈接
化學資訊
化學式C9H13N
摩爾質量135.20622 g/mol[19]
3D模型（JSmol（英語：JSmol））
密度0.9±0.1 g/cm3 at 25 °C[20]
熔點11.3 °C（52.3 °F） (預測)[22]
沸點203 °C（397 °F） 為 760 毫米汞柱[21]
  • NC(CC1=CC=CC=C1)C
  • InChI=1S/C9H13N/c1-8(10)7-9-5-3-2-4-6-9/h2-6,8H,7,10H2,1H3 checkY
  • Key:KWTSXDURSIMDCE-UHFFFAOYSA-N checkY

安非他命（英語：amphetamine, alpha-methylphenethylamine）（化學式：C₆H₅CH₂CH(CH₃)NH₂，為中樞神經刺激劑，用來治療注意力不足過動症、嗜睡症、和肥胖症。英語源通稱「安非他命」擷取自α-甲基苯乙胺的英文讀法「alpha‑methylphenethylamine」之縮讀。安非他命是在1887年發現的，以兩種對映異構體的形式存在[I]，分別是左旋安非他命和右旋安非他命。準確來說，安非他命指的是特定的化學物質，是外消旋的純胺類型態（英語：free base）[24][25]，這個物質等同於安非他命的兩個對映異構體：左旋安非他命和右旋安非他命等量之純胺類型態。不過，安非他命一詞已用來表示任何比例安非他命對映異構體的組合，或是任一種異構體[26][25][27]。

以往曾用安非他命來治療鼻塞和抑鬱。在非醫療用途上，安非他命也有用作體能增強藥物、益智藥、春藥及欣快藥物。安非他命在許多國家為合法的處方藥。然而，私自散布和囤積安非他命被視為非法行為，因為安非他命被用於非醫療用途的助興可能性極高，而且有明顯健康上的危害[25][28][24]。

首個藥用安非他命的藥品名稱為Benzedrine。當今藥用安非他命[參 1]以下列幾種形式存在：外消旋安非他命[參 2]、阿得拉爾 [II]、右旋安非他命，或前驅藥物甲磺酸賴氨酸安非他命。安非他命藉著自身作用於兒茶酚胺神經傳導元素：正腎上腺素及多巴胺的特點來活化痕量胺受體（英語：TAAR1），進而增加單胺類神經遞質和神經遞質在腦內的活動。[1][11][30]

在醫療用的劑量範圍內，安非他命能帶來情緒以及執行功能的變化，例如：欣快感的增強、性慾的改變、清醒度的提升、大腦執行功能的進化。安非他命所改變的生理反應包含：減少反應時間、降低疲勞、以及肌耐力的增強。若攝取劑量遠超過醫療用的劑量範圍，將會導致大腦執行功能受損以及橫紋肌溶解症，攝取過份超越醫療用劑量範圍的安非他命可引發嚴重的藥物成癮，服用遠超醫療用劑量範圍的安非他命會引起精神疾病（例如：妄想、偏執）。然而長期攝取醫療劑量範圍的安非他命並不會引起上述疾病。那些為享樂而攝入的安非他命通常會遠超過醫療用劑量範圍，且伴隨著非常嚴重甚至致命的副作用。[11][31][32][33]。

安非他命屬於苯乙胺衍生物。安非他命的衍生物也歸在同一分類中[參 3]的分類中[III]，比如說：安非他酮[參 4]、卡西酮、MDMA、和甲基苯丙胺[參 5]。安非他命也與人體內可自然生成的兩個屬於痕量胺的神經傳導物質——特別是苯乙胺和N-甲基苯乙胺——有關。苯乙胺只比安非他命少了一個甲基，而N-甲基苯乙胺則是安非他命的結構異構（差異只在於甲基位置的不同）。[34][35][36]

用途

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醫療

[編輯]
參見：注意力不足過動症 § 藥物

安非他命可以治療注意力不足過動症（ADHD）、嗜睡症（一種睡眠疾病）、和肥胖症。有時候安非他命會以仿單標示外使用的方式處方來治療頑固性憂鬱症（英語：treatment-resistant depression）和頑固性強迫症[1][11][37][38]。在動物試驗中，已知非常高劑量的安非他命會造成某些動物的多巴胺系統（英語：dopamine receptor）和神經系統的受損。[39][40]但是，在人體試驗中，注意力不足過動症患者在接受安非他命的治療後，則發現安非他命可促進大腦的發育及神經的成長。[41][42][43]

回顧許多核磁共振照影（英語：Nuclear Magnetic Resonance Imaging）的研究後發現，長期以安非他命治療注意力不足過動症患者能顯著降低患者大腦結構及大腦執行功能上的異常。並且改善大腦中數個部位，例如：基底神經節的右尾狀核[41][42][43]。

眾多臨床研究的系統性及統合性回顧已確立長期使用安非他命治療注意力不足過動症的療效及安全。[44][45][46][47]

持續長達兩年的隨機對照試驗[參 6][a]結果顯示：長期使用安非他命治療注意力不足過動症，是有效且安全的[44][47]。

兩個系統性/統合性回顧的結果顯示長期且持續地使用中樞神經興奮劑治療注意力不足過動症能有效地減少注意力不足過動症的核心症狀（核心症狀即為：過動、衝動和分心/無法專心）、增進生活品質、提升學業成就、廣泛地強化大腦的執行功能。[IV]這些執行功能分別與下列項目有關：學業、反社會行為、駕駛習慣、藥物濫用、肥胖、職業、日常活動、自尊心、服務使用（例如：學習、職業、健康、財金、和法律等）、社交功能[45][47]。

一篇系統性／統合性回顧標誌了一個重要發現：一個為期九個月的隨機雙盲試驗中，持續以安非他命治療的ADHD患者，其智力商數平均增加4.5單位[註 1]，且在專注力、衝動、過動的改善皆呈現持續進步的態勢。[44]另一篇系統性／統合性回顧則指出：根據迄今為止為時最長的數個臨床追蹤研究[參 7]，可以得到一個結論：即便從兒童時期開始以中樞神經興奮劑治療直到老年，中樞神經興奮劑都能持續有效地控制ADHD的症狀並且減少物質濫用的風險。[47] 研究表明，ADHD與大腦的執行功能受損有關。而這些受損的執行功能分別與大腦中部分的神經傳導系統（英語：neurostransmitter systems）有關[參 8][48]；又此部分受損的神經傳導系統和中腦皮質激素（英語：mesocorticolimbic projection）-多巴胺[參 9]的傳導及藍斑核[參 10]和前額葉[參 11]中的正腎上腺素[參 12]的傳導相關。[48]

中樞神經興奮劑，例如：methylphenidate和安非他命對於治療ADHD都是有效的，因為中樞神經興奮劑刺激了上述神經系統中的神經傳導物質活動。[31][48][49]

至少超過80%的ADHD患者在使用中樞神經興奮劑治療後，其ADHD的症狀可以獲得改善。[50]

使用中樞神經興奮劑治療的ADHD患者相較之下，普遍與同儕及家庭成員的關係較佳並且在學校擁有較好的表現。興奮劑能使ADHD患者較不易分心、衝動、且擁有較長的專注力時間和範圍。[51][52]

根據考科藍協作組織[參 13]所提供的文獻回顧結果[V]指出：使用中樞神經興奮劑治療的ADHD患者即便其症狀改善，相較於使用非中樞神經興奮劑，仍因副作用而有較高的停藥率。[54][55]

回顧結果也發現，中樞神經興奮劑並不會惡化抽動綜合症的症狀，例如：妥瑞氏症，除非服用dextroamphetamine[b]的劑量過高才有可能在部分妥瑞氏症合併注意力不足過動症患者身上觀察到抽動綜合症的症狀惡化。[56]

中樞神經興奮劑只要依照醫師指示用藥，都是相當安全的。[57][58][59][59][60]中樞神經興奮劑，例如：利他能與專思達，可能導致：心悸、頭痛、胃痛、喪失食慾、失眠、因相對專注而變得冷淡（面無表情）等副作用，因此6歲以下的兒童不適宜服用。（副作用產生與否因人而異）[61]

隨著時間推進與各方的努力，中樞神經興奮劑的相關副作用已可藉由包括但不限於劑量調整、服藥時間、飯前飯後服用、服藥頻率等服藥模式之改變以及改變藥物組合等方式獲得相當程度的減少。[59][62][63][64][65]

提昇表現

[編輯]
認知方面

2015年，一篇系統性回顧[參 14]和一篇元分析/整合分析[參 15]回顧了數篇優秀的臨床試驗[參 16]報告後發現，低劑量（醫療用劑量）的安非他命能適度但不強烈地促進一個人的認知功能，包含工作記憶、長期的情節記憶、抑制控制以及在一些方面的注意力。[66] [67]安非他命強化認知功能的效果已知是部分透過間接活化（英語：indirect agonist）在大腦前額葉的多巴胺受體D1（英語：dopamine receptor D1）和腎上腺素受體 α2（英語：Alpha-2 adrenergic receptor）。[31] [66]一篇2014年的系統性回顧發現，低劑量（醫療用劑量）的安非他命能促進和穩固記憶鞏固的過程，進而提升一個人回憶的能力。[68]低劑量（醫療用劑量）的安非他命也可增加大腦皮層（質）區的效率，這能讓一個人的工作記憶獲得進步。[31][69]安非他命和其他用於治療ADHD的中樞神經刺激劑能透過提升task saliency（英語：Incentive salience）來增加一個人去做事情的動機、並強化一個人的警覺心（清醒度），因而能刺激一個人開始做「以目標為導向」的行為。[31][70][71]中樞神經興奮劑（例如：安非他命）能提升一個人在困難且枯燥的任務中的表現。[31][71][72]超過醫療用劑量範圍（包含其誤差範圍及容許最大上限）的安非他命劑量將不利於工作記憶和其他的認知功能。[31][71]

生理

雖然安非他命可以提升速度、耐力（延遲疲勞的發生）、肌耐力、身體素質和警覺心並減少心理反應時間。[32][73][74][75]然而，「非因醫療需求使用安非他命」在各種運動場合都是被嚴格禁止的。[76][77]

安非他命藉由抑制多巴胺在中樞神經系統中的回收及外流來促進耐力和反應時間的提升。[74][75][78]安非他命和其他作用於多巴胺系統的藥物一樣，都能增加在固定施力（levels of perceived exertion（英語：rating of perceived exertion））下的動力（能）輸出。這是因為安非他命能奪取（override）體溫的「安全開關」的控制權並將身體核心溫度的上限提高以取得在體溫安全上限提高前被身體保留的能量。[75][79][80]於醫療用劑量範圍（包含其誤差範圍），安非他命的副作用不至於影響運動員的運動表現；[32][74]然而，當攝取的劑量過多時，安非他命可能會引起嚴重的後果，例如：橫紋肌溶解症和高熱(體溫過高)。[33][81][74]

醫療上的禁忌

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參見：苯丙胺 § 交互作用

根據國際化學品安全規劃署（IPCS, International Programme on Chemical Safety）和美國食品藥物管理局(USFDA)，[VI]安非他命不建議處方給有藥物濫用、心血管疾病、對於各種刺激嚴重反應過度、和嚴重焦慮歷史的人。[VII][83][84]安非他命也不被建議處方給正經歷動脈血管硬化（血管硬化）、中度到重度高血壓、青光眼（眼壓過高）、或甲狀腺機能亢進（身體在體內製造出過量的甲狀腺賀爾蒙/激素）的人。[83][84][85]曾對中樞神經刺激劑有藥物過敏的人以及正在服用單胺氧化酶抑制劑(MAOI)或單胺氧化酶抑制劑類藥物(MAOIs)，可能不適合使用安非他命。即便曾有合併使用安非他命和單胺氧化酶抑制劑後仍一切平安的案例。[83][84][86][87]

IPCS和美國食品藥物管理局也同意患有神經性厭食症、雙極性情感疾患、憂鬱、高血壓、狂躁、思覺失調症、雷諾氏症候群、癲癇發作、抽動綜合症、妥瑞氏症、和有甲狀腺問題、肝腎問題的人在使用安非他命時應密切追蹤上述疾病的變化。[83][84]

人體試驗證明，醫療用劑量下的安非他命並不會導致胎兒或新生兒畸形。然而超越醫療用劑量甚多的安非他命確實會增加胎兒或新生兒畸形的機會。[84]

研究觀察發現，安非他命會進入母親的母乳中，因此建議母親不要在使用安非他命藥物的期間內授乳。[83][84]

由於安非他命可能影響食慾繼而導致可反轉的身高及體重的成長遲緩，[VIII]，因此建議兒童或青少年在用藥期間定期測量自己的身高及體重。[83]

副作用

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安非他命的副作用以及其發生率和嚴重度大致上與使用的劑量呈正相關。[33][89][73]成分為安非他命的藥品，諸如：阿得拉爾、Dexedrine、和安非他命的等價物質（generic equivalents）目前皆已獲得美國食品藥物管理署許可用於長期性的治療。[89][29]

攝取大幅超出醫療劑量的安非他命將大幅增加嚴重副作用出現的風險。[73]

生理

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在治療劑量下，生理副作用會因年齡或個人情況而有所不同[89]。心血管方面的副作用包含：迷走-血管反射（英語：vasovagal response）導致的高血壓或是低血壓、雷諾氏症（因小動脈收縮而導致流往手腳的血流減少）、以及心搏過速（tachycardia）。[89][73][88]

男性性方面而言，副作用可能包含：勃起障礙、頻繁勃起、或是勃起時間過長。[89]

消化方面的副作用可能包含：腹痛、喪失胃口、反胃以及體重降低。[89][90]其他潛在的副作用包含：視力模糊、口乾、磨牙、流鼻血、多汗症、藥物性鼻炎（英語：rhinitis medicamentosa）（藥物導致的鼻塞）、癲癇閾值/觸發門檻（英語：seizure threshold）降低，以及抽搐[來源組 1]。在一般的治療劑量下鮮少發生危險副作用[73]。

安非他命刺激延腦的呼吸中樞（英語：Respiratory center），使得呼吸變得較快速且較深。[73]正常人在治療劑量下，此作用通常難以察覺；然而，此作用在呼吸已經受損的病人身上有可能變得明顯。[73]

安非他命會使膀胱括約肌收縮，而導致解尿困難[73]。此效果可以應用在遺尿或是失去膀胱控制能力的病人身上。[73]

安非它命在胃腸道的作用是難以預測的[73]。安非他命可能會減少胃腸活動力（英語：gastrointestinal motility）（內容物通過腸胃道的速率）[73]；然而，安非他命亦可能在胃腸道的平滑肌處於鬆弛狀態時，增加其活動力。[73]

安非他命有輕微的止痛作用且可以增強鴉片類物質的止痛作用。[73]

美國食藥署2011年委任的研究發現：不論是小孩或是成人，「安非他命（於醫療情境下使用）」和「其他用於治療ADHD的中樞神經興奮劑」均和重大的心血管疾病（猝死、心臟病發、中風）無關[來源組 2]；然而，當病患已有心血管方面的疾病時，禁用此藥。[來源組 3]

心理

[編輯]

在醫療用劑量範圍，最常見的副作用為：警覺心的增強、（對未來或即將發生的不愉快之事的）憂慮/擔心/恐懼、理解力提升、專注力的提升、主動性/自主決斷行事的能力的提升、自信心的提升、社交能力的提升；情緒陰晴不定、失眠或清醒、和疲勞感的減退。[89][73]

比較少見的副作用包括焦慮、性慾改變、應激性、重複性的或強迫性的行為（repetitive or obsessive（英語：Fixation (psychology)） behaviors）、靜不下來;[來源組 4]。副作用出現與否因人而異，端視用藥者的個性及精神狀態（mental state）。

安非他命所引起的精神疾病，例如：妄想和偏執，可能出現在重度的使用者身上。[33][89][98]長期攝取醫療劑量的安非他命雖然有可能引起上一段文中所述的疾病，但這是非常罕見的。[33][89][99]根據美國食品藥物管理局所提供的資訊，「目前沒有證據顯示『中樞神經刺激劑』會導致『攻擊性的行為（aggressive behavior）』或『敵意（hostility）』」。[89]

使用醫療劑量的用藥者可能會培養出習慣在某個特定地方用藥的偏好。[54][100][100][101]

法律

[編輯]

安非他命在中華民國受毒品危害防制條例管制，若無處方箋，在司法上視為第二級管制藥品，持有、運輸、販賣皆為違法行為。[102]

嚴重過量

[編輯]

安非他命過量使用會引起許多症狀，然而在適當的醫療照護下，不至於死亡。[84][103]

藥物過量症狀的嚴重度與劑量成正比；與身體對安非他命的藥物耐受性成反比。[73][84]已知每天攝取達到5公克的安非他命（每天最大攝取量的五十倍）會導致身體對安非他命產生藥物耐受性。[84]嚴重過量的安非他命攝取所致的症狀列於下方；安非他命中毒一旦到達出現全身抽搐和昏迷則必須立刻急救以避免死亡。[33][73]在2013年，安非他命、甲基安非他命和其他列於ICD-10 第五章：精神和行為障礙§使用化學藥物、物質或酒精引起的精神和行為障礙中的安非他命相關物質的過量使用在世界上共導致3788人死亡。(3,425–4,145人死亡、95%信賴區間）。[IX][104]

被過度活化達到病態程度的中腦邊緣迴路（英語：mesolimbic pathway）（一個連接腹側被蓋區和伏隔核的多巴胺通道（英語：dopamine pathway）），在安非他命的成癮中扮演著主要的角色。[105][106]

當一個人經常服用嚴重過量的安非他命，將伴隨安非他命成癮的高度風險，因為持續過量的安非他命會逐漸增加伏隔核的ΔFosB（「成癮」與否的分子開關和主控蛋白）的檔次。[107][108][109]一旦伏隔核的ΔFosB過度表達，這個人的「成癮性行為」[註 2]（例如：出現試圖取得安非他命的衝動行為）將開始隨之增加。[107][110]雖然目前沒有治療安非他命成癮的有效藥物，但規律的且每次都有持續一定時間的有氧運動能降低安非他命的成癮風險也是治療安非他命成癮的天然療法。[111][112][來源組 5]運動能提升臨床治療（英語：clinical therapy）的預後，且可能與認知行為治療（目前已知最有效的安非他命成癮的臨床治療法）相搭配為聯合療法。[111][113][114]

嚴重過量的安非他命劑量所致的症狀（依照體內生物系統分類）
生物系統 輕度、中度過量[33][73][84] 過量[來源組 6]
心臟血管系統
中樞神經系統
肌肉骨骼系統
呼吸系統
  • 呼吸過速
生殖泌尿系統
其他

成癮

[編輯]
「成癮及生理、心理依賴」的相關術語詞彙表[101][108][117][118]
  • 成癮：腦部失調的情形，特徵是會強迫性的接觸犒賞刺激，不去考慮其帶來的負面結果。
  • 成癮行為：具有犒賞性及正向增強效應的行為
  • 成癮藥物：具有犒賞性及正向增強效應的藥物
  • 依賴性：之前曾頻繁接觸刺激源（例如藥物攝取），中斷接觸後出現戒斷症狀的情形
  • 藥物敏化或逆耐藥性：在固定藥物劑量的情形下重複給藥，而相同劑量的藥物效果增強的情形
  • 藥物戒斷：在重複藥物使用後停藥，出現的症狀
  • 生理依賴：出現持續生理戒斷症狀（例如疲勞及震顫性譫妄）的依賴性
  • 心理依賴：出現情緒或是精神戒斷症狀（例如煩躁及失樂）的依賴性
  • 增強刺激：特定類型的刺激，接觸後會增加再接觸此刺激的可能性
  • 犒賞刺激：特定類型的刺激，大腦會認為此刺激是正向的，會想再進行的
  • 敏化作用：重複接受某一刺激後產生的刺激增強性反應
  • 物質使用疾患 ：使用特定物質，而且造成臨床上或是功能上的損傷或是困境的情形
  • 藥物耐受性：重複接受某一藥物後產生的藥物降低性反應
造成安非他命成癮的位於伏隔核中的訊息傳遞
閱 · 編
圖像頂端包含可點擊的鏈接
本圖表描繪在中腦周邊/邊緣迴路（英語：Mesolimbic pathway）中由於「長期攝取超高劑量的中樞神經刺激劑（例如：安非他命、甲基苯丙胺、和苯乙胺.）使得多巴胺的神經突觸的濃度增加」的微觀示意圖。

長期服用遠超醫療用劑量範圍的安非他命會導致安非他命成癮。然而長期攝取醫療劑量範圍的安非他命並不會引起上述問題。[119][120][121]安非他命濫用（例如：長期攝取嚴重過量的安非他命）會導致大腦對於該劑量產生藥物耐受性。漸漸地，濫用者必須服用更大量的安非他命以換取同樣的效果。[122][123]

分子生物機轉

[編輯]

當前關於「長期安非他命濫用所致的成癮」的模型中，已知會改變一些腦部的結構（特別是伏隔核）[124][125][126]。造成腦部結構改變的最重要的轉錄因子（transcription factor）為：ΔFosB、cAMP反應元件結合蛋白(CREB（英語：cAMP response element binding protein）)、和核因子κB(NF-κB)。[X][125]ΔFosB在藥物成癮的發展過程中扮演著至關重要的角色，主要的原因在於其在伏隔核中D1-type（英語：D1-type）中型多棘神經元的過度表達，為「成癮」及「成癮衍生的行為」及「神經元為了適應新常態所做的調適」的充分且必要條件。[XI][107][108][125]

一旦ΔFosB充分過度表達（sufficiently overexpressed），將誘發越來越嚴重的成癮狀態並伴隨ΔFosB值的持續創新高。[107][108]ΔFosB已被證明與酒精成癮、大麻成癮、古柯鹼成癮、派醋甲酯成癮、尼古丁成癮、鴉片成癮、phencyclidine（英語：phencyclidine）成癮、異丙酚、和安非他命的替代性物質（英語：substituted amphetamines）成癮、及其他成癮有關。[來源組 7]ΔJunD（英語：ΔJunD）為一個轉錄因子；而G9a（英語：EHMT2）為組織蛋白甲基轉移酶的一種。ΔJunD（英語：ΔJunD）和G9a（英語：EHMT2）直接與伏隔核中的ΔFosB值的升高成反比。[108][125][130]

利用載體讓伏隔核中的ΔJunD充分過度表達，可以使由長期藥物濫用所致的漸進式神經元和行為改變完全停止。（比如說：ΔFosB所致的改變）。[125]ΔFosB也在人們於天然酬賞（英語：natural reward）（natural rewards）中的行為反應調節上扮演重要的腳色。天然酬賞包含：美味的食物、性愛、運動......。[110][125][131]因為天然酬賞以及成癮性藥物皆會激發（英語：inducible gene）ΔFosB（這些酬賞讓大腦刺激ΔFosB的增加），長期過度地從事上述行為將可能導致類似的成癮之病理生理（pathological）。[110][125]

ΔFosB是導致「安非他命成癮」、「安非他命引起的性成癮」中最關鍵的致癮因素。「安非他命引起的性成癮」為「安非他命使用」加上「過度的性活動」所引發的「衝動之下的性行為」。[110][132][133]這類的性成癮與多巴胺失調症候群（英語：dopamine dysregulation syndrome）相關，有時此症會出現在正在服用作用於多巴胺的藥物（英語：dopaminergic#Supplements and drugs）的人身上。[110][131]

安非他命基因調控（gene regulation）的效果端視劑量與通路（dose- and route-dependent）而定。[126]絕大多數主題為「基因調節（gene regulation）」和「成癮」的研究都是透過動物試驗以及利用靜脈注射的方式對實驗動物注射超高劑量的安非他命來進行。[126]少數幾個透過人體試驗（依照體重來決定醫療用劑量）來進行的研究表明，口服醫療用劑量的安非他命並不會影響基因調控，即便有，也是極為輕微的。這表示安非他命用作醫療用途是十分安全的。[126]

藥物治療

[編輯]
更多資訊：成癮 § 研究

截至2014年5月 (2014-05)並沒有能夠有效治療安非他命成癮的藥理療法[134][135][136]。2015年到2016年間的論文回顧結果指出：選擇性TAAR1（英語：TAAR1）促進劑有非常大的可能在將來被用來治療中樞神經興奮劑的成癮；[137][138]然而，截至2016年2月 (2016-02)，已知可作為選擇性TAAR1（英語：TAAR1）促進劑的物質都屬於試驗性藥物（英語：experimental drug）。[137][138]安非他命成癮與伏隔核中的多巴胺接收器（英語：dopamine receptor）們以及位置相同（co-localized）的NMDA 接受器們的活化高度相關；[XII][106]鎂離子藉由封鎖一個接受器-鈣離子通道，來阻斷 NMDA接受器們。[106][139]一篇論文回顧做成結論：根據動物試驗，因成癮而使用中樞神經刺激劑的人，可以發現過量的中樞神經興奮劑顯著降低腦細胞內部的鎂離子活動。[106]利用鎂元素補充劑，能降低安非他命使用者自我服用（英語：self-administration）[c]的機會。然而這不被認為是有效治療安非他命成癮的單一療法（mono-therapy）。[XIII][106]

行為治療

[編輯]

認知行為治療是當前治療中樞神經刺激劑成癮的療法。[114]除此之外，運動在生物神經元產生的效果（英語：neurobiological effects of physical exercise）的研究中表明維持每天從事有氧運動（例如：跑步等）的習慣，能避免藥物成癮纏身；本身也是一個對於治療安非他命成癮的有效附加療法（英語：adjunct theraot）。[來源組 5]運動能讓所有疾病的預後都更加樂觀，特別是對於中樞神經刺激劑成癮。[111][113][140]值得一提的是，有氧運動能降低擅自服用中樞神經興奮劑的慾望，降低再次擅自服用中樞神經興奮劑的機率（英語：Relapse）（reinstatment）(i.e., relapse)、降低「試圖取得藥物所做出的舉動（drug-seeking behavior）」、降低多巴胺受體D2在紋狀體中的密度。[110][140]它在病生理學中的腳色是相對於「興奮劑的使用」和「興奮劑的效果」，它會引起紋狀體中DRD2密度的減少。[110]一篇論文回顧提到，藉由改變紋狀體（striatum）中的ΔFosB、c-Fos（英語：c-Fos） immunoreactivity（英語：immunoreactivity）或部份的腦內回饋系統來避免藥物成癮在一個人身上的發展。[112]


成癮相關的可塑性的總結
神經可塑性和行為可塑性（英語：行為可塑性）的形式 增強物的種類 來源
鴉片類 中樞神經刺激劑 高脂肪或高糖食物 性交 運動與神經元關係 環境豐富化
伏隔核中D1-type中的ΔFosB表現 ↑ ↑ ↑ ↑ ↑ ↑ [110]
行為可塑性
攝取量的增加 有 有 有 [110]
中樞神經刺激劑跨越-敏化作用 有 不適用 有 有 削減 削減 [110]
未經過處方而自行私下攝取中樞神經刺激劑 ↑ ↑ ↓ ↓ ↓ [110]
強化「在特定地點攝取興奮劑的習慣」 ↑ ↑ ↓ ↑ ↓ ↑ [110]
強化「試圖取得該致癮藥物的行為」 ↑ ↑ ↓ ↓ [110]
神經化學物質的可塑性
伏隔核中CREB磷酸化 ↓ ↓ ↓ ↓ ↓ [110]
伏隔核中對於多巴胺的過敏反應 沒有 有 沒有 有 [110]
經過變動的紋狀體多巴胺接收器的訊號發送 ↓DRD2 , ↑DRD3（英語：DRD3） ↑DRD1（英語：DRD1）, ↓DRD2 , ↑DRD3（英語：DRD3） ↑DRD1（英語：DRD1）, ↓DRD2, ↑DRD3（英語：DRD3） ↑DRD2 ↑DRD2 [110]
經過變動的紋狀體鴉片樣肽受體的訊號發送 未改變，或
↑μ-鴉片接收器（英語：μ-opioid receptor）		 ↑μ-鴉片接收器
↑κ-鴉片接收器（英語：κ-opioid receptor）		 ↑μ-鴉片接收器 ↑μ-鴉片接收器 未改變 未改變 [110]
發生於紋狀體鴉片肽的改變 ↑強啡肽（英語：dynorphin）
腦啡肽（英語：enkephalin）未改變		 ↑強啡肽 ↓腦啡肽 ↑強啡肽 ↑強啡肽 [110]
多巴胺通道的神經突觸的可塑性
伏隔核中樹突的數量 ↓ ↑ ↑ [110]
伏隔核中樹突棘的密度 ↓ ↑ ↑ [110]

註解：DRD2 = 多巴胺受體D2；↑ = 上升；↓ = 下降



依賴和戒斷症狀

[編輯]

根據另一篇由考科藍協作組織所做的一篇論文回顧指出當一個長期嚴重攝取安非他命或甲基安非他命的藥物成癮者某天突然停止攝取安非他命或甲基安非他命，那麼根據許多成癮個案的報告顯示，具有時效性（time-limited）的戒斷症狀將在他們上一次攝取安非他命後的24小時內出現。 在成癮患者停用安非他命後，安非他命的戒斷症狀的出現率接近九成。這九成都出現至少六個定義在「《精神疾病診斷與統計手冊》安非他命戒斷症狀」中的症狀。年紀與劑量和戒斷症狀的嚴重度呈正相關。安非他命的戒斷症狀共有兩個階段且總共可能歷時三周或更多。第一階段（撞牆期marked "crush" phase）約持續一周。[141]安非他命的戒斷症狀可能包含：對於各種刺激極度敏感、躁動不安（irritability）、焦慮、對於安非他命有難以抑制的渴求（英語：Craving (withdrawal)）、煩躁、疲倦、多食症、過動或行動遲緩（英語：decreased movement）、缺乏動機、嗜睡、和清醒夢。[141][142]

這些特徵及症狀必須非由其他疾病（包含心理疾病）引起，且無法歸因於其他物質的濫用。滿足上述條件，才符合「安非他命戒斷症狀」症候群的診斷標準。[141][143]

通過美國食品藥物管理局嚴格審核的安非他命藥品說明書上並未提到任何安非他命在醫療用劑量下突然停用會導致任何安非他命戒斷症狀的出現。[85][144][145][146]

DSM中，安非他命中毒及戒斷症狀之標準

[編輯]

DSM-5中關於興奮劑中毒的標準如下：

A.最近曾經服用過安非他命類的物質、可卡因或其他興奮劑

B.在服用興奮劑時（或者服用後很快表現出）臨床表現出顯著問題行為或心理變化（如：欣快症或感情遲鈍；群性、社交性的改變；過於警覺；人際交往敏感；焦慮、緊張或者惱怒；刻板行為；判斷力受損）。

C.在服用興奮劑時或服用後即刻表現出以下任意兩種（或以上）症狀：

  • 心動過速或心動過緩
  • 瞳孔擴散
  • 血壓升高或降低
  • 出汗或發冷
  • 感到噁心或嘔吐
  • 體重降低
  • 精神運動性焦躁或精神運動性遲滯
  • 肌肉無力、呼吸抑制、胸口疼痛或心律失常
  • 精神錯亂、癲癇、運動困難、肌張力障礙或昏迷

包括其他物質中毒的情況在內，其他身體情況不可能出現該發病跡象、症狀，並且也無法理解為其他的精神問題。

DSM-5中關於興奮劑戒斷症狀的標準如下：

A.停止服用（或減少服用）長期的安非他命類物質、可卡因或其他興奮劑。

B.在A的情況發生後的幾小時至幾天內，出現煩躁的情緒並伴有以下任意兩種（或以上）的心理變化：

  • 疲勞
  • 生動而不愉快的夢
  • 失眠或嗜睡
  • 食慾增大
  • 精神運動性焦躁或精神運動性遲滯

B中的症狀或跡象導致了臨床顯著的壓力，或者在社會、工作等重要方面功能出現受損。

安非他命戒斷症狀的頻率列表

[編輯]
停止服用硫酸安非他命後，個人報告的戒斷症狀的百分比
症狀 頻率
無症狀 14%
易怒 78%
疼痛和痛苦 58%
感到沮喪 50%
社交能力受損 46%
發抖、出冷汗 36%
難以入睡 32%
虛脫 22%
噁心、嘔吐 16%
頭痛 14%
難以保持清醒 12%
食慾增大 12%
便秘 10%
食慾縮小 8%
腹瀉 6%

[147]

個人嘗試戒毒和接受醫學指導戒毒的原因與百分比
原因 個人嘗試戒毒 醫學指導戒毒
對生活整體現狀（犯罪、無聊、金錢）不滿 42（89%） 6（37%）
對心理健康感到擔憂（偏執、憂慮、依賴） 25（53%） 3（19%）
家庭原因（父母或配偶的壓力，子女出生） 24（51%） 5（31%）
身體健康（動脈注射、血管萎陷、感染） 17（36%） 4（25%）
避免入獄 0 2（12%）
其他原因 2（4%） 0

[147]

用來協助戒毒的方法
- 自我嘗試戒毒（Self detoxication） 被迫戒毒（Enforced detoxication）
服用更多其他藥物 - -
大麻（Cannabis） 22(27%) 10(59%)
替馬西泮（Temazepam） 21(26%) -
酒精 17(21%) 2(12%)
鴉片類物質（Opiates） 12(15%) 1(6%)
地西泮（Diazepam） 4(5%) -
巴比妥類藥物（Barbiturates） 3(4%) 1(6%)
心理學技巧 - -
轉移注意力（例如：工作、看電視） 35(21%) 1(6%)
不再與藥物成癮的朋友來往 31(19%) -
獲得人們的支持（家庭、社會中的支持團體） 11(7%) -
把藥物及針頭丟掉 5(3%) -

[147]

中毒與致病

[編輯]

中毒

[編輯]

在囓齒動物（rodents）和靈長類動物（primates）的藥物試驗發現到，夠高的安非他命劑量會導致多巴胺神經中毒（英語：neurotoxicity）甚或致使多巴胺末梢神經（英語：axon terminal）受損退化並降低轉運體和接收器（英語：dopaminergic receptor）的功能。[148][149]目前並無證據顯示安非他命會直接荼毒人類的神經。[150][151]然而，超高劑量（large doses）的安非他命攝取量可能會產生高熱（體溫過高）的現象並間接導致：多巴胺的神經性中毒（dopaminergic neurotoxicity）、過多的活性氧類（reactive oxygen species）生成、自然氧化（autoxidation）增加。[來源組 8]從高劑量的安非他命攝取量引起的神經中毒的生物模式中發現，人體核心體溫高於40°C是「高劑量的安非他命攝取量」是否引起神經中毒的「必要條件」。[149]在動物試驗中，若動物的腦溫長期超過40°C，容易因過多的活性氧類生成、受干擾的細胞蛋白功能和短暫的血腦屏障標準放寬而促使安非他命性的神經中毒發生。[149]

致病

[編輯]

嚴重的安非他命過量可能造成「中樞神經刺激劑過量所引發的精神異常（stimulant psychosis）」，症狀包含但不限於幻覺（delusion）和被害妄想、疑神疑鬼、妄想、偏執等。[98]此機制用於思覺失調症研究時誘發精神病發作的藥物。[154]一篇由考科藍協作組織所做的論文回顧及統整發現在所有因攝取嚴重過量的「安非他命、dextro-安非他命、及甲基安非他命」而導致精神異常的患者中，有5%-15%的患者即便經過治療，仍無法完全康復。[98][155]

根據同一篇由考科藍協作組織所做的論文回顧及統整，至少一個實驗（trial）顯示抗精神病藥物（antipsychotic）能有效解決因嚴重過量的安非他命所致的急性精神異常症狀。 [98]另外，穩定在服用抗精神病藥物的人使用安非他命後心跳血壓等生理變化也較一般人來的少。[154]

「攝取醫療劑量的安非他命所致的急性精神異常」是非常罕見的（very rare）。
（非常罕見 very rare： < 1/10000 ；罕見 rare：>= 1/10000 & <1/1000）[99][83]

交互作用

[編輯]
參見：苯丙胺 § 醫療上的禁忌

目前已知許多種物質都會和安非他命發生藥物相互作用，導致安非他命或參與作用的另一物質的藥效（英語：drug action）或代謝過程發生改變。[4][156]用於分解安非他命的酶的抑制劑（如CYP2D6、FMO3（英語：Flavin-containing monooxygenase 3#Ligands））都會延長其半衰期，這意味着藥效會更持久。[17][156]安非他命也會和MAOIs產生交互作用，特別是MAOI類中的monoamine oxidase A（英語：monoamine oxidase A）抑制劑（monoamine oxidase A inhibitors）。

因為MAOIs和安非他命兩者都會增加兒茶酚胺（i.e.,正腎上腺素和多巴胺）在血漿中的濃度[156]；因此MAOIs與安非他命合併使用是危險的[156]。

安非他命會調節幾乎所有作用於中樞神經的藥物的活動。特別需要注意的是，安非他命可能會降低鎮靜劑和中樞神經抑制劑）的效果，並增加其他中樞神經刺激劑和抗憂鬱藥的效果。[156]

安非他命也可能降低抗高血壓藥和抗精神病藥（anti-psychotics）的藥效，這是因為安非他命本身對於血壓及多巴胺系統的作用。[156]

鋅的補充劑可能會降低安非他命用於治療注意力不足過動症時的最小有效劑量（minimum effective dose）。[XIV][160]

整體來說，安非他命並不會與日常生活中常見的食物起任何重大的交互作用，但安非他命的吸收和排泄會分別受到腸胃內容物（gastrointestinal content）的pH值和尿液的酸鹼值影響。[156] 酸性物質會減少安非他命的吸收並增加尿液的排泄；鹼性物質則相反。

由於pH值在安非他命的吸收這件事上具有影響力，所以安非他命也會和 氫離子幫浦阻斷劑（PPI, proton pump inhibitors）和H2受體阻抗劑（H2 antihistamines）等中和胃酸的制酸劑產生交互作用。[156]

藥學

[編輯]

藥物代謝動力學

[編輯]

安非他命的口服生物體可利用率[參 17]與腸胃的pH值連動；[156]安非他命非常容易在腸道被吸收，右旋苯丙胺的生體可利用率在多數的情況下高於75%。[2]安非他命呈弱鹼性，其pKa值介於9–10之間;[4]因此，當pH值呈鹼性時，多數的安非他命會以其易溶於脂類的純胺類型態（英語：free base）形式存在。在此情況下，身體會通過腸道上皮組織富含脂類的細胞膜[參 18]來吸收安非他命。[4][156]相反地，酸性的pH值表示安非他命主要以易溶於水的離子（鹽）形式存在，因此較少能被吸收。[4]大約15–40%循環於血管中的安非他命與血漿蛋白[參 19]相連接。[3]安非他命的對映異構物的半衰期會隨著尿液的pH值而有所不同。[4]當尿液的酸鹼值落在正常範圍中，右旋苯丙胺和左旋苯丙胺的半衰期分別為9–11小時及11–14小時。[4]酸性飲食會導致安非他命的對映異構物的半衰期降低至8–11小時；鹼性飲食則會使安非他命的對映異構物的半衰期增加到16–31小時。[5][12]

成分為安非他命或其衍生物的短效藥品大約在口服後三小時在體內達到最高血漿濃度（英語：plasma concentration）；而成分為安非他命或其衍生物的長效藥品則在口服後大約七小時在體內達到最高血漿濃度。[4]

安非他命主要透過腎臟來代謝，大約30–40%的藥物以藥物本身原始的型態從酸鹼度正常的尿液中排出。[4] 尿液是鹼性時，安非他命傾向以其純胺類型態存在，因此較少被排泄。[4]

當尿液的pH值失常時，各種安非他命的分解物在尿液中重新結合的程度將從最低1%到最高75%。該程度的高低大多取決於於尿液的酸鹼值，尿液越酸，結合率越高；尿液愈鹼，結合率越低。[4]安非他命通常於口服後兩天內自體內完全代謝完畢。[5]安非他命確切的半衰期及藥效作用期隨著（小於兩天的）重複服用導致的血漿內安非他命濃度（plasma concentration of amphetamine）的增加而延長。[161]

對人體無藥效的前藥（prodrug）：賴氨酸安非他命並不若安非他命一樣容易受腸胃道環境的pH值影響；[162]賴氨酸安非他命在腸道被吸收進入血管的血液後很快就會透過水解的方式轉化為右旋安非他命。而參與這水解反應的酶與紅血球有關。[162]

Lisdexamfetamine的半衰期通常小於一個小時。[162]

細胞色素 P450 2D6（Cytochrome P450 2D6、或CYP2D6）、多巴胺β羥化酶（Dopamine β-hydroxylase、或DBH）、flavin-containing monooxygenase 3（英語：flavin-containing monooxygenase 3）、butyrate-CoA ligase（英語：butyrate-CoA ligase）、和glycine N-acyltransferase（英語：glycine N-acyltransferase）為已知在人體中參與[註 3]「安非他命」及「安非他命代謝後之產物」的代謝反應的酶。[來源組 9]

「安非他命代謝後之產物」包含：4-hydroxyamphetamine（英語：4-hydroxyamphetamine）、4-hydroxynorephedrine（英語：4-hydroxynorephedrine）、4-羥基苯基丙酮、苯甲酸、馬尿酸、苯丙醇胺、苯基丙酮[註 4][4][5][6]。

在這些「安非他命代謝後之產物」之中，有實際藥效的產物（sympathomimetics）為：4‑hydroxyamphetamine[166]、4‑hydroxynorephedrine[6]、和norephedrine[167]。 [166]4‑hydroxynorephedrine,[168]and norephedrine.[167]

安非他命的主要代謝途徑包含：芳香對羥基化、脂肪族α-、β-羥基化、N-氧化、N-脫烷基、和脫氨基。[4][5]

下圖為已知的「安非他命」代謝途徑和「安非他命代謝後之產物」：[4][17][6]

苯丙胺的代謝途徑
Graphic of several routes of amphetamine metabolism
苯丙胺
Para-
Hydroxylation
Para-
Hydroxylation
Para-
Hydroxylation
Beta-
Hydroxylation
Beta-
Hydroxylation
Oxidative
Deamination
Oxidation
Glycine
Conjugation
圖像頂端包含可點擊的鏈接
在這些「安非他命代謝後之產物」之中，主要的且有實際藥效的產物為：4-hydroxyamphetamine 和去甲麻黃鹼（norephedrine）。[6]

從酸鹼度正常的尿液中可發現，大約30–40%的「安非他命」以本身原始的型態排出；大約50%的安非他命以不具藥效的「安非他命代謝後之產物」（即為圖片中最下列的產物）的型態排出。 [4]

剩下的10–20%則為「安非他命代謝後之產物」之中，有實際藥效的產物。 [4]

苯甲酸（Benzoic acid）被butyrate-CoA連接酶（butyrate-CoA ligase）代謝後成為一個中介物質/中間產物（intermediate product）：benzoyl-CoA（英語：benzoyl-CoA） [164]

隨後透過glycine N-acyltransferase代謝並轉化為馬尿酸（hippuric acid）。[165]

藥物效應動力學

[編輯]
  關於安非他明作用機制的一個更簡單且比較非技術性的解釋，請見「阿得拉爾 § Mechanism of action」。
苯丙胺在多巴胺能神經元的藥物效應動力學
閱 · 編
A pharmacodynamic model of amphetamine and TAAR1
via AADC
圖像頂端包含可點擊的鏈接
Amphetamine enters the presynaptic neuron across the neuronal membrane or through DAT. Once inside, it binds to TAAR1 or enters synaptic vesicles through VMAT2. When amphetamine enters the synaptic vesicles through VMAT2, dopamine is released into the cytosol (yellow-orange area). When amphetamine binds to TAAR1, it reduces postsynaptic neuron firing rate via potassium channels（英語：G protein-coupled inwardly-rectifying potassium channel） and triggers protein kinase A (PKA) and protein kinase C (PKC) signaling, resulting in DAT phosphorylation. PKA-phosphorylation causes DAT to withdraw into the presynaptic neuron (internalize) and cease transport. PKC-phosphorylated DAT may either operate in reverse or, like PKA-phosphorylated DAT, internalize and cease transport. Amphetamine is also known to increase intracellular calcium, an effect which is associated with DAT phosphorylation through a CAMKIIα（英語：CAMKIIα）-dependent pathway, in turn producing dopamine efflux.

安非他命藉由將單胺類神經遞質在腦中（主要於腦中那酬賞與執行功能路徑上的兒茶酚胺的神經元）的用途改變為神經訊號來產生療效。[30][49]

安非他命作用於monoamine transporter（英語：monoamine transporter）上的效應使得犒賞系統和管控功能中的主要神經傳導物質（多巴胺、正腎上腺素）依安非他命的劑量，成比例的迅速上升。[30][49][169]

服用安非他命所帶來的增強和促進motivational salience（英語：motivational salience）的效果起因於中腦邊緣通路中的多巴胺活動變得更加活躍之故。[31]

安非他命帶給使用者的欣快感和運動協調激勵（英語：locomotor stimulation）之效果和安非他命刺激紋狀體（英語：striatum）的神經突觸之多巴胺和正腎上腺素濃度增加的速度和規模成正比[1]。

安非他命已經被確認為trace amine-associated receptor 1（英語：TAAR1）(TAAR1)[註 5]的強刺激劑（potent full agonist）。[30][170]

TAAR1受額外刺激後會藉由活化腺苷酸環化酶和抑制單胺轉運蛋白（英語：monoamine transporter）的功能而增加cAMP的生成。[30][171]

單胺的自身受體（英語：autoreceptors）（例如：D2 short、presynaptic α2（英語：Alpha-2 adrenergic receptor）、和presynaptic 5-HT1A（英語：5-HT1A）)）具有與TAAR1相反的效果，而這些受體形成了一個對於單胺的管理系統。[30][137]

值得注意的是，安非他命和痕量胺擁有對TAAR1相當高的連結親緣性（連結吸引力），但對於單胺之autoreceptors（英語：autoreceptors）則不然。[30][137]

神經造影研究表示，安非他命和痕量胺對單胺類神經遞質的再回收抑制作用具有位置上的針對性，進一步來說，就是針對那些相關且有TAAR1同時存在的單胺類神經遞質神經元。[30]

截至2010年 (2010-Missing required parameter 1=month!)，TAAR1和多巴胺轉運體的「共同位置化」co-localization現象已可在恆河猴身上透過視覺化的方式觀察到，但【帶有去甲腎上腺素轉運體(NET)的TAAR1】和【血清素轉運體(SERT)】的共同位置化現象迄今只能透過信使核糖核酸(mRNA)的表現（expression）來證明。[30]

已隱藏部分未翻譯內容，歡迎參與翻譯。

In addition to the neuronal monoamine transporters, amphetamine also inhibits both vesicular monoamine transporters, VMAT1 and VMAT2, as well as SLC1A1, SLC22A3, and SLC22A5.[來源組 10] SLC1A1 is excitatory amino acid transporter 3 (EAAT3), a glutamate transporter located in neurons, SLC22A3 is an extraneuronal monoamine transporter that is present in astrocytes, and SLC22A5 is a high-affinity carnitine transporter.[來源組 10]Amphetamine is known to strongly induce cocaine- and amphetamine-regulated transcript (CART) gene expression,[3][178]a neuropeptide involved in feeding behavior, stress, and reward, which induces observable increases in neuronal development and survival in vitro.[3][179][180]The CART receptor has yet to be identified, but there is significant evidence that CART binds to a unique Gi/Go-coupled GPCR.[180][181]Amphetamine also inhibits monoamine oxidases at very high doses, resulting in less monoamine and trace amine metabolism and consequently higher concentrations of synaptic monoamines.[19][182]In humans, the only post-synaptic receptor at which amphetamine is known to bind is the 5-HT1A receptor, where it acts as an agonist with micromolar affinity.[183][184]

The full profile of amphetamine's short-term drug effects in humans is mostly derived through increased cellular communication or neurotransmission of dopamine,[30]serotonin,[30]norepinephrine,[30]epinephrine,[169]histamine,[169]CART peptides,[3][178]endogenous opioids,[185][186][187]adrenocorticotropic hormone,[188][189]corticosteroids,[188][189]and glutamate,[172][174]which it effects through interactions with CART, 5-HT1A, EAAT3, TAAR1, VMAT1, VMAT2, and possibly other biological targets.[來源組 11]

Dextroamphetamine is a more potent agonist of TAAR1 than levoamphetamine.[190]Consequently, dextroamphetamine produces greater CNS stimulation than levoamphetamine, roughly three to four times more, but levoamphetamine has slightly stronger cardiovascular and peripheral effects.[73][190]

歷史、社會與文化

[編輯]

成藥

[編輯]

目前幾種安非他命的處方藥配方含有兩種對映異構體，包括阿得拉爾，Dyanavel XR和Evekeo，其中最後一種是外消旋的安非他命硫酸鹽。[1][37][90]目前的一些品牌及其通用等同物如下。

成分為安非他命的藥品
Amphetamine pharmaceuticals
藥物商品名稱 United States
Adopted Name 		(D:L) ratio 藥劑型
Dosage
form 		上市日期Marketing
start date 		來源
Adderall – 3:1 (salts) 錠劑
tablet		 1996 [1][29]
Adderall XR – 3:1 (salts) 膠囊
capsule		 2001 [1][29]
Adzenys XR amphetamine 3:1 (base) ODT（英語：Orally disintegrating tablet） 2016 [191][192]
Dyanavel XR amphetamine 3.2:1 (base) suspension 2015 [90][193]
Evekeo amphetamine sulfate 1:1 (salts) tablet 2012 [37][194]
Dexedrine dextroamphetamine sulfate 1:0 (salts) capsule 1976 [1][29]
ProCentra dextroamphetamine sulfate 1:0 (salts) liquid 2010 [29]
Zenzedi dextroamphetamine sulfate 1:0 (salts) tablet 2013 [29]
Vyvanse lisdexamfetamine dimesylate 1:0 (prodrug) capsule 2007 [1][162]
tablet
An image of the lisdexamfetamine compound
The skeletal structure of lisdexamfetamine
已上市安非他命藥物中的安非他命物質組成　
藥物 化學式 分子量[XV] amphetamine base
[XVI] 		amphetamine base
in equal doses 		doses with
equal base content[XVII]
(g/mol) (percent) (30 mg dose)
total base total dextro- levo- dextro- levo-
dextroamphetamine sulfate[196][197] (C9H13N)2•H2SO4
368.49
270.41
73.38%
73.38%
—
22.0 mg
—
30.0 mg
amphetamine sulfate[198] (C9H13N)2•H2SO4
368.49
270.41
73.38%
36.69%
36.69%
11.0 mg
11.0 mg
30.0 mg
Adderall
62.57%
47.49%
15.08%
14.2 mg
4.5 mg
35.2 mg
25% dextroamphetamine sulfate[196][197] (C9H13N)2•H2SO4
368.49
270.41
73.38%
73.38%
—
25% amphetamine sulfate[198] (C9H13N)2•H2SO4
368.49
270.41
73.38%
36.69%
36.69%
25% dextroamphetamine saccharate[199] (C9H13N)2•C6H10O8
480.55
270.41
56.27%
56.27%
—
25% amphetamine aspartate monohydrate[200] (C9H13N)•C4H7NO4•H2O
286.32
135.21
47.22%
23.61%
23.61%
lisdexamfetamine dimesylate[201] C15H25N3O•(CH4O3S)2
455.49
135.21
29.68%
29.68%
—
8.9 mg
—
74.2 mg
amphetamine base suspension[XVIII][90] C9H13N
135.21
135.21
100%
76.19%
23.81%
22.9 mg
7.1 mg
22.0 mg

備註A

[編輯]
  1. ^ 對映異構體指的是兩個形狀相同但方向相反的兩個分子，二個分子互為鏡像。[23]Levoamphetamine 和 dextroamphetamine 分別被簡稱為 L-amph 或 levamfetamine (INN) 和 D-amph 或 dexamfetamine (INN) [19]
  2. ^ "阿得拉爾"是一個品牌名稱而非公有領域的稱呼。但因為以下幾個安非他命的異構物的名稱及其英文名稱 ("dextroamphetamine sulfate, dextroamphetamine saccharate, amphetamine sulfate, and amphetamine aspartate") 太長了，因此本文將以此品牌名稱來表示此種安非他命的混合物。[29])
  3. ^ 「安非他命」一詞也意指一個化學分類，但與「安非他命衍生物」這個化學分類不同的是，「安非他命」類在學術上並無標準的定義。[14][25] 有一個「安非他命」類的定義嚴格限定分類中僅有：安非他命的racemate and enantiomers和甲基安非他命methamphetamine的racemate and enantiomers。[25] 大多數「安非他命」類的定義為那些在藥理學上以及結構上與安非他命相關的化合物。[25]
    為避免讀者混淆，本條目中僅會使用amphetamine、amphetamines來表示racemic amphetamine, levoamphetamine, and dextroamphetamine；安非他命衍生物（substituted amphetamines）來表示安非他命的結構分類。
  4. ^ 研究證實，長期以中樞神經興奮劑治療ADHD能在下列這些方面產生大幅的進步：學業、駕駛、降低藥物濫用、降低肥胖、自尊、和社交功能等。[45]

    在上述領域中，最為突出的領域為： 學業（例如：GPA分數、成果測驗分數、受教育的時間長度、和教育程度）、自尊（例如：自尊心測驗分數、嘗試自殺的次數、自殺率等）和社交功能（例如：peer nomination scores、社交技巧、家庭關係、同儕關係、和浪漫關係/情侶關係）[45]

    長期以「藥物治療合併行為治療」的模式來治療ADHD，能夠比單獨以藥物治療，產生更全面且更長足的進步。 [45]
  5. ^ 考科藍協作組織對於歷年眾多的「隨機對照試驗」的系統性回顧、數據統整分析後所得出的總結，基本上都是非常有水準且深具參考價值的。 [53]
  6. ^ 美國食品藥物管理局核准的藥品使用指引及醫療上的禁忌（放在藥盒中的仿單/說明書）並非為了限制醫師的決策而是為了避免藥商恣意宣稱藥物的作用。醫師可以此為參考，並依照每位病人的實際情況做出獨立的判斷。 [82]
  7. ^ 然而根據一篇回顧性論文，安非他命可以處方給曾有藥物濫用歷史的人，不過需要有對患者適度的藥品控管，例如：每天由醫護人員配給處方劑量。[1]
  8. ^ 曾受此副作用的用藥者，身高及體重在在短暫停藥後恢復至應有水準是可以被預期的。[44][47][88] 根據追蹤，持續三年過程不停歇的安非他命治療（沒有合併任何積極減少安非他命副作用的療法的情況下）平均會減少 2公分的最終身高。 [88]
  9. ^ 「95% 信賴區間」指的是：有95%的機率，真實的死亡人數介於3,425 和 4,145 之間。
  10. ^ 轉錄因子是一種可以增加或降低一個特定基因的基因表現的蛋白。[127]
  11. ^ 簡單來說，這裡的「充分且必要（necessary and sufficient）」關係指的是「ΔFosB在伏隔核中的過度表達（over-expression）」與「成癮衍生的行為」及「神經元為了適應新常態所做的調適」永遠都是一起發生。
  12. ^ NMDA接受器們為與電壓相關的ligand-gated ion channels（英語：ligand-gated ion channels）。ligand-gated ion channels（英語：ligand-gated ion channels）這個通道需要glutamate 以及一個共同促進劑（co-agonist ）：(D-serine 或 大豆屬glycine)的同時連接才能被開啟。
    [139]
  13. ^ 該篇回顧表示magnesium L-aspartate（英語：magnesium aspartate） 及 氯化鎂能大幅改善成癮行為。
  14. ^ The human dopamine transporter contains a high affinity extracellular zinc binding site（英語：binding site） which, upon zinc binding, inhibits dopamine reuptake（英語：reuptake） and amplifies amphetamine-induced dopamine efflux（英語：neurotransmitter efflux） in vitro.[157][158][159]The human serotonin transporter and norepinephrine transporter do not contain zinc binding sites.[159]
  15. ^ For uniformity, molecular masses were calculated using the Lenntech Molecular Weight Calculator[195] and were within 0.01g/mol of published pharmaceutical values.
  16. ^ Amphetamine base percentage=molecular massbase / molecular masstotal. Amphetamine base percentage for Adderall = sum of component percentages / 4.
  17. ^ (1 / amphetamine base percentage) × scaling factor = (molecular masstotal / molecular massbase) × scaling factor. The values in this column were scaled to a 30 mg dose of dextroamphetamine sulfate. Due to pharmacological differences between these medications (e.g., differences in the release, absorption, conversion, concentration, differing effects of enantiomers, half-life, etc.), the listed values should not be considered equipotent doses.
  18. ^ This product (Dyanavel XR) is an oral suspension (i.e., a drug that is suspended in a liquid and taken by mouth) that contains 2.5 mg/mL of amphetamine base.[90] The product uses an ion exchange resin to achieve extended release of the amphetamine base.[90]

備註B

[編輯]
  1. ^ 智力測驗結果與專注力有關，詳見注意力不足過動症#智力
  2. ^ 因成癮所致的行為
  3. ^ 酶做為反應的催化劑catalyst，並不實際參與反應。
  4. ^ 不是苯丙酮
  5. ^ a Gs-coupled（英語：Gs alpha subunit） and Gq-coupled（英語：Gq alpha subunit） G protein-coupled receptor (GPCR) discovered in 2001, which is important for regulation of brain monoamines.

備註C

[編輯]
  1. ^

註釋

[編輯]
  1. ^ 又稱為「隨機分配且包含控制組的臨床試驗」，是臨床試驗的一種
  2. ^ 中樞神經興奮劑的一種
  3. ^ （self-administration，i.e., doses given to oneself）

英文名稱對照

[編輯]
  1. ^ 英文名稱為：Pharmaceutical amphetamine
  2. ^ 英文名稱為：racemic amphetamine
  3. ^ 英文名稱為：substituted amphetamine
  4. ^ 英文名稱為：Bupropion
  5. ^ 英文名稱為：meth-amphetamine
  6. ^ 英文名稱為：Randomized controlled trials
  7. ^ 英文名稱為：follow-up studies
  8. ^ 英文名稱為：neurotransmitter systems
  9. ^ 英文名稱為：dopamine
  10. ^ 英文名稱為：locus coeruleus
  11. ^ 英文名稱為：prefrontal cortex
  12. ^ 英文名稱為：nor-epinephrine或nor-adrenaline
  13. ^ 英文名稱為：Cochrane Collaboration
  14. ^ 英文名稱為：systematic review
  15. ^ 英文名稱為：meta-analysis
  16. ^ 英文名稱為：clinical trial
  17. ^ 英文名稱為：bioavailability
  18. ^ 英文名稱為：cell membrane
  19. ^ 英文名稱為：plasma protein

引用

[編輯]
  1. ^ [89][73][88][90][91]
  2. ^ [92][93][94][95]
  3. ^ [83][84][92][94]
  4. ^ [96][89][73][97]
  5. ^ 5.0 5.1 [110][111][112][113][140]
  6. ^ [115][33][73][103][116]
  7. ^ [107][110][125][128][129]
  8. ^ [149][152][153]
  9. ^ [4][14][163][16][17][18][164][165]
  10. ^ 10.0 10.1 [169][172][173][174][175][176][177]
  11. ^ [30][169][173][174][178][183]

來源

[編輯]
  1. ^ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 Heal DJ, Smith SL, Gosden J, Nutt DJ. Amphetamine, past and present – a pharmacological and clinical perspective. J. Psychopharmacol. June 2013, 27 (6): 479–496. PMC 3666194 可免費查閱. PMID 23539642. doi:10.1177/0269881113482532. The intravenous use of d-amphetamine and other stimulants still pose major safety risks to the individuals indulging in this practice. Some of this intravenous abuse is derived from the diversion of ampoules of d-amphetamine, which are still occasionally prescribed in the UK for the control of severe narcolepsy and other disorders of excessive sedation. ... For these reasons, observations of dependence and abuse of prescription d-amphetamine are rare in clinical practice, and this stimulant can even be prescribed to people with a history of drug abuse provided certain controls, such as daily pick-ups of prescriptions, are put in place (Jasinski and Krishnan, 2009b). 
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    Table 9.2 Dextroamphetamine formulations of stimulant medication
    Dexedrine [Peak:2–3 h] [Duration:5–6 h] ...
    Adderall [Peak:2–3 h] [Duration:5–7 h]
    Dexedrine spansules [Peak:7–8 h] [Duration:12 h] ...
    Adderall XR [Peak:7–8 h] [Duration:12 h]
    Vyvanse [Peak:3–4 h] [Duration:12 h]     
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    "Table 5: N-containing drugs and xenobiotics oxygenated by FMO （頁面存檔備份，存於網際網路檔案館）"
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    Physiologic and performance effects
     · Amphetamines increase dopamine/norepinephrine release and inhibit their reuptake, leading to central nervous system (CNS) stimulation
     · Amphetamines seem to enhance athletic performance in anaerobic conditions 39 40
     · Improved reaction time
     · Increased muscle strength and delayed muscle fatigue
     · Increased acceleration
     · Increased alertness and attention to task     
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    [Figure 4](b) Examples of synthetic, pharmaceutically important substituted amphetamines.     
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    DOSAGE FORMS AND STRENGTHS
    Extended-release oral suspension contains 2.5 mg amphetamine base per mL.     
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  98. ^ 98.0 98.1 98.2 98.3 Shoptaw SJ, Kao U, Ling W. Shoptaw SJ, Ali R , 編. Treatment for amphetamine psychosis. Cochrane Database Syst. Rev. January 2009, (1): CD003026. PMID 19160215. doi:10.1002/14651858.CD003026.pub3. A minority of individuals who use amphetamines develop full-blown psychosis requiring care at emergency departments or psychiatric hospitals. In such cases, symptoms of amphetamine psychosis commonly include paranoid and persecutory delusions as well as auditory and visual hallucinations in the presence of extreme agitation. More common (about 18%) is for frequent amphetamine users to report psychotic symptoms that are sub-clinical and that do not require high-intensity intervention ...
    About 5–15% of the users who develop an amphetamine psychosis fail to recover completely (Hofmann 1983) ...
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  109. ^ Robison AJ, Nestler EJ. Transcriptional and epigenetic mechanisms of addiction. Nat. Rev. Neurosci. November 2011, 12 (11): 623–637. PMC 3272277 可免費查閱. PMID 21989194. doi:10.1038/nrn3111. ΔFosB serves as one of the master control proteins governing this structural plasticity. 
  110. ^ 110.00 110.01 110.02 110.03 110.04 110.05 110.06 110.07 110.08 110.09 110.10 110.11 110.12 110.13 110.14 110.15 110.16 110.17 110.18 110.19 110.20 110.21 Olsen CM. Natural rewards, neuroplasticity, and non-drug addictions. Neuropharmacology. December 2011, 61 (7): 1109–1122. PMC 3139704 可免費查閱. PMID 21459101. doi:10.1016/j.neuropharm.2011.03.010. Similar to environmental enrichment, studies have found that exercise reduces self-administration and relapse to drugs of abuse (Cosgrove et al., 2002; Zlebnik et al., 2010). There is also some evidence that these preclinical findings translate to human populations, as exercise reduces withdrawal symptoms and relapse in abstinent smokers (Daniel et al., 2006; Prochaska et al., 2008), and one drug recovery program has seen success in participants that train for and compete in a marathon as part of the program (Butler, 2005). ... In humans, the role of dopamine signaling in incentive-sensitization processes has recently been highlighted by the observation of a dopamine dysregulation syndrome in some patients taking dopaminergic drugs. This syndrome is characterized by a medication-induced increase in (or compulsive) engagement in non-drug rewards such as gambling, shopping, or sex (Evans et al., 2006; Aiken, 2007; Lader, 2008). 
  111. ^ 111.0 111.1 111.2 111.3 Lynch WJ, Peterson AB, Sanchez V, Abel J, Smith MA. Exercise as a novel treatment for drug addiction: a neurobiological and stage-dependent hypothesis. Neurosci. Biobehav. Rev. September 2013, 37 (8): 1622–1644. PMC 3788047 可免費查閱. PMID 23806439. doi:10.1016/j.neubiorev.2013.06.011. These findings suggest that exercise may 「magnitude」-dependently prevent the development of an addicted phenotype possibly by blocking/reversing behavioral and neuroadaptive changes that develop during and following extended access to the drug. ... Exercise has been proposed as a treatment for drug addiction that may reduce drug craving and risk of relapse. Although few clinical studies have investigated the efficacy of exercise for preventing relapse, the few studies that have been conducted generally report a reduction in drug craving and better treatment outcomes ... Taken together, these data suggest that the potential benefits of exercise during relapse, particularly for relapse to psychostimulants, may be mediated via chromatin remodeling and possibly lead to greater treatment outcomes. 
  112. ^ 112.0 112.1 112.2 Zhou Y, Zhao M, Zhou C, Li R. Sex differences in drug addiction and response to exercise intervention: From human to animal studies. Front. Neuroendocrinol. July 2015, 40: 24–41. PMID 26182835. doi:10.1016/j.yfrne.2015.07.001. Collectively, these findings demonstrate that exercise may serve as a substitute or competition for drug abuse by changing ΔFosB or cFos immunoreactivity in the reward system to protect against later or previous drug use. ... The postulate that exercise serves as an ideal intervention for drug addiction has been widely recognized and used in human and animal rehabilitation. 
  113. ^ 113.0 113.1 113.2 Linke SE, Ussher M. Exercise-based treatments for substance use disorders: evidence, theory, and practicality. Am. J. Drug Alcohol Abuse. January 2015, 41 (1): 7–15. PMC 4831948 可免費查閱. PMID 25397661. doi:10.3109/00952990.2014.976708. The limited research conducted suggests that exercise may be an effective adjunctive treatment for SUDs. In contrast to the scarce intervention trials to date, a relative abundance of literature on the theoretical and practical reasons supporting the investigation of this topic has been published. ... numerous theoretical and practical reasons support exercise-based treatments for SUDs, including psychological, behavioral, neurobiological, nearly universal safety profile, and overall positive health effects. 
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  119. ^ Malenka RC, Nestler EJ, Hyman SE. Chapter 15: Reinforcement and Addictive Disorders. Sydor A, Brown RY (編). Molecular Neuropharmacology: A Foundation for Clinical Neuroscience 2nd. New York: McGraw-Hill Medical. 2009: 368. ISBN 9780071481274. Such agents also have important therapeutic uses; cocaine, for example, is used as a local anesthetic (Chapter 2), and amphetamines and methylphenidate are used in low doses to treat attention deficit hyperactivity disorder and in higher doses to treat narcolepsy (Chapter 12). Despite their clinical uses, these drugs are strongly reinforcing, and their long-term use at high doses is linked with potential addiction, especially when they are rapidly administered or when high-potency forms are given. 
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  135. ^ Perez-Mana C, Castells X, Torrens M, Capella D, Farre M. Efficacy of psychostimulant drugs for amphetamine abuse or dependence. Cochrane Database Syst. Rev. September 2013, 9: CD009695. PMID 23996457. doi:10.1002/14651858.CD009695.pub2. To date, no pharmacological treatment has been approved for [addiction], and psychotherapy remains the mainstay of treatment. ... Results of this review do not support the use of psychostimulant medications at the tested doses as a replacement therapy 
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  137. ^ 137.0 137.1 137.2 137.3 Grandy DK, Miller GM, Li JX. "TAARgeting Addiction"-The Alamo Bears Witness to Another Revolution: An Overview of the Plenary Symposium of the 2015 Behavior, Biology and Chemistry Conference. Drug Alcohol Depend. February 2016, 159: 9–16. PMID 26644139. doi:10.1016/j.drugalcdep.2015.11.014. When considered together with the rapidly growing literature in the field a compelling case emerges in support of developing TAAR1-selective agonists as medications for preventing relapse to psychostimulant abuse. 
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  140. ^ 140.0 140.1 140.2 Carroll ME, Smethells JR. Sex Differences in Behavioral Dyscontrol: Role in Drug Addiction and Novel Treatments. Front. Psychiatry. February 2016, 6: 175. PMC 4745113 可免費查閱. PMID 26903885. doi:10.3389/fpsyt.2015.00175. Physical Exercise
    There is accelerating evidence that physical exercise is a useful treatment for preventing and reducing drug addiction ... In some individuals, exercise has its own rewarding effects, and a behavioral economic interaction may occur, such that physical and social rewards of exercise can substitute for the rewarding effects of drug abuse. ... The value of this form of treatment for drug addiction in laboratory animals and humans is that exercise, if it can substitute for the rewarding effects of drugs, could be self-maintained over an extended period of time. Work to date in [laboratory animals and humans] regarding exercise as a treatment for drug addiction supports this hypothesis. ... Animal and human research on physical exercise as a treatment for stimulant addiction indicates that this is one of the most promising treatments on the horizon.     
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維基共享資源中相關的多媒體資源：苯丙胺
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