- Alcoholism
- Alkaloids
- Allergies to Alcohol and Drugs
- Amantadine
- American Academy of Addiction Psychiatry (AAAP)
- American Society of Addiction Medicine (ASAM)
- Amobarbital
- Amotivational Syndrome
- Amphetamine
- Amphetamine Epidemics
- Amygdala
- Anabolic Steroids
- Analgesic
- Anhedonia
- Anorectic
- Anorexia
- Anslinger, Harry Jacob, and U.S. Drug Policy
- Antagonist
- Antidepressant
- Antidote
- Antipsychotic
- Antisocial Personality
- Anxiety
- Aphrodisiac
- Argot
- Arrestee Drug Abuse Monitoring (ADAM)
- Asia, Drug Use in
- Assessment of Substance Abuse: Drug Abuse Screening Test (DAST)
- Assessment of Substance Abuse: HIV Risk Assessment Battery (RAB)
- Assessment of Substance Abuse: T-ACE
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