- Holistic treatment
- Herbal drugs
- Hypothalamus
- Holistic programs
- Hormones
- Halfway house
- Hallucinogen
- Harm reduction
- Hashish
- Heroin
- Histrionic personality disorder
- Holographic memory resolution
- Hydrocodone
- Hypnotherapy
- High-functioning alcoholic
- Heroin addiction
- Hydromorphone
- Hypnogen
- Hycodan
- Hypnotic
- Histamine
- Hallucinations
- Halcion
- Harrison Narcotics Tax Act
- Healing touch therapy
- Heroin use (history of)
- Hakomi method of body-centered psychotherapy
- Horticultural therapy
- Human givens therapy