- Haemophilus influenza type B vaccine
- Hair loss – treatment
- HandiHaler
- Heparin
- Hepatitis A vaccine
- Hepatitis B vaccine
- Hiprex
- Histaclear®
- Hormone replacement therapy
- HPV vaccine
- HRT
- Humira
- Hybloc®
- Hydrocortisone (tablets)
- Hydrocortisone acetate (foam enema)
- Hydroxocobalamin
- Hydroxycarbamide
- Hydroxychloroquine
- Hydroxyurea
- Hygroton®
- Hyoscine (patch)
- Hyoscine (tablets)
- Hypericum
- Hypericum perforatum
- Hytrin®