- Or-Phen-Ade
- Ora Relief
- Orabase
- Orabase HCA
- Orabloc
- Orabrite
- Oracea
- Oracit
- Orajel
- Orajel Bleeding Gum Rinse
- Orajel Cold Sore
- Orajel Dry Mouth
- Orajel Mouth Sore Medicine
- Orajel Mouth Sore Rinse
- Orajel Mouth-Aid
- Orajel My Way
- Orajel Perioseptic Maximum Strength
- Orajel Single Dose Cold Sore
- Orajel Ultra
- Oral B Anti-Cavity
- Oral superabsorbent hydrogel
- Oral-B Instant Pain Relief
- Oral-B Minute-Foam
- Oral-B Neutra
- Oral-B Rinse
- Oralair
- Oraline
- Oralone
- OraMagic Plus
- Oramorph
- Oramorph SR
- Orap
- Orapred
- Oraqix
- Orasep
- Orasone
- Oratuss
- OraVerse
- Oravig
- Oraxyl
- Orazinc
- Orbactiv
- Orbivan
- Orbivan CF
- Orciprenaline
- Orciprenaline, Combinations
- Ordinary Salt Combinations
- Ordinary Salt Combinations And Antiflatulents
- Ordrine
- Ordrine AT
- Orencia
- Orenitram
- Oretic
- Oreton Methyl
- Orfadin
- Orgadin
- Orgadin-Tuss DM
- Organ-1 NR
- Organic Nitrates In Combination
- Organic Nitrates In Combination With Psycholeptics
- Organidin NR
- Organix Complete
- Organo-heparinoid
- Orgaran
- Orgotein
- Oriahnn
- Orilissa
- Orinase
- Orinase Diagnostic
- Oritavancin
- Orkambi
- Orlenta
- Orlistat
- Ormazine
- Ormeloxifen
- Ornacycline
- Ornacyn
- Ornade Spansules
- Ornex
- Ornidazole
- Ornipressin
- Ornithine Oxoglurate
- Orphenadrine (chloride)
- Orphenadrine (citrate)
- Orphenadrine, Combinations
- Orphengesic
- Orsythia
- Ortho Dienestrol
- Ortho Evra
- Ortho Micronor
- Ortho Tri-Cyclen
- Ortho Tri-Cyclen Lo
- Ortho-Cept
- Ortho-Cyclen
- Ortho-Novum
- Orthoclone OKT3
- Orthovisc
- Orthowash
- Orudis
- Orudis KT
- Oruvail
- Orvaten