| Name | Aliases |
|---|---|
| Ortho Tri-Cyclen (Ethinyl Estradiol / Norgestimate) | |
| Ortho Tri-Cyclen Lo (Norgestimate / Ethinyl Estradiol) | Ethinyl Estradiol / Norgestimate |
| Ortho-Novum 1/35 (Ethinyl Estradiol / Norethindrone) | |
| Orthovisc (Hyaluronan) | |
| Orudis E (Ketoprofen) | |
| Oruvail (Ketoprofen) | |
| Oscillococcinum (Anas Barbariae) | |
| Oseltamivir Phosphate (Tamiflu) | |
| Oseni (Pioglitazone Hydrochloride / Alogliptin Benzoate) | |
| Osilodrostat (Isturisa) | |
| Osimertinib (Tagrisso) | |
| Osmolex ER (Amantadine Hydrochloride) | Gocovri |
| Ospemifene (Osphena) | Senshio |
| Osphena (Ospemifene) | Senshio |
| Osurnia Otic Gel (Betamethasone Acetate / Florfenicol / Terbinafine Hydrochloride) | |
| Oteseconazole (Vivjoa) | |
| Otezla (Apremilast) | Otezla Titration Pack |
| Otezla Titration Pack (Apremilast) | Otezla |
| Otomax Ointment (Gentamicin Sulfate / Betamethasone Valerate / Clotrimazole) | |
| Otosporin Ear Drops (Polymyxin B Sulfate / Neomycin Sulfate / Hydrocortisone) | Cortisporin Otic Solution |