- Ophthaine
- Ophthalmic
- Ophthetic
- Ophtho-Bunolol
- Ophtho-Chloram Ophthalmic Solution
- Ophtho-Dipivefrin
- Ophtho-Tate
- Ophthochlor Ophthalmic Solution
- Opium Preparations
- Oprelvekin
- OptiPranolol
- Opticaine
- Opticrom
- Opticyl
- Optimine
- Optivar
- Or-Tyl
- Orabase, Baby
- Orabase-B with Benzocaine
- Orabase-HCA
- Oracit
- Oracort
- Oradexon
- Oragrafin Calcium
- Oragrafin Sodium
- Orajel Extra Strength
- Orajel Liquid
- Orajel Maximum Strength
- Orajel Nighttime Formula, Baby
- Orajel, Baby
- Oralone
- Oralyte
- Oramorph SR
- Orap
| - Oraphen-PD
- Orasone
- Orasone 1
- Orasone 10
- Orasone 20
- Orasone 5
- Orasone 50
- Oratect Gel
- Orazinc
- Orbenin
- Oretic
- Oreticyl
- Oreticyl Forte
- Orfadin
- Orfro
- Organidin NR
- Orgaran
- Orimune
- Orinase
- Orlistat
- Ornex Caplets containing Acetaminophen and Pseudoephedrine Hydrochloride
- Ornex Maximum Strength Caplets
- Ornex Maximum Strength Caplets containing Acetaminophen and Pseudoephedrine Hydrochloride
- Ornex Severe Cold No Drowsiness Caplets
- Ornidyl
- Oro-Clense
- Orphenadrine
- Orphenadrine and Aspirin
- Orphenagesic
- Orphenagesic Forte
- Orphenate
- Orphengesic Forte containing Orphenadrine Citrate, Aspirin, and Caffeine
- Orphengesic containing Orphenadrine Citrate, Aspirin, and Caffeine
| - Ortho 0.5/35
- Ortho 1/35
- Ortho 10/11
- Ortho 7/7/7
- Ortho Evra
- Ortho Tri-Cyclen
- Ortho-Cept
- Ortho-Creme
- Ortho-Cyclen
- Ortho-Est .625
- Ortho-Est 1.25
- Ortho-Gynol
- Ortho-Novum 1/35
- Ortho-Novum 1/50
- Ortho-Novum 10/11
- Ortho-Novum 7/7/7
- Ortho-Prefest
- Ortho-Prefest containing Estradiol and Norethindrone
- Ortho/CS
- Orthoclone OKT3
- Orudis
- Orudis KT
- Orudis-E
- Orudis-SR
- Oruvail
- Os-Cal
- Os-Cal 500
- Os-Cal 500 Chewable
- Os-Cal Chewable
- Oseltamivir
- Osmoglyn
- Osmolite
- Osmolite HN
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