- Olanzapine
- Olmesartan Medoxomil
- Olmesartan Medoxomil + Hydrochlorothiazide
- Olopatadine Hydrochloride (Nasal Spray)
- Olopatadine Hydrochloride Solution (Ophthalmic)
- Olopatadine Ophthalmic Solution 7 mg
- Olopatadine Ophthalmic Solution 2 mg
- Omeprazole
- Ondansetron
- Orlistat
- Oseltamivir
- Osimertinib
- Oxymetazoline Hydrochloride (Nasal Preparation)
- Oxymetazoline Hydrochloride (Cream)
- Oxytocin