See Drug Interventions by First Letter (O)
- O(6)-benzylguanine
- O-(chloroacetylcarbamoyl)fumagillol
- O-desmethylvenlafaxine
- Ochratoxin A
- Octenidine
- Octoxynol
- Octreotide
- Octylmethoxycinnamate
- Octylonium
- Ofloxacin
- Olaflur
- Olanzapine
- Oleander
- Oleanol
- Oleoyl-estrone
- Olive
- Olmesartan
- Olmesartan medoxomil
- Olopatadine
- Olsalazine
- Oltipraz
- Omalizumab
- Omega 3 Fatty Acid
- Omega-Conotoxins
- Omega-N-Methylarginine
- Omeprazole
- Omeprazole, sodium bicarbonate drug combination
- Ondansetron
- ONO 5046
- ONYX015
- Opioid Peptides
- Opium
- Opium Poppy
- Oprelvekin
- Orange
- Oregano
- Orexins
- Orlistat
- Ornithine
- Orphenadrine
- Ortho Evra
- Oseltamivir
- Oxacillin
- Oxaliplatin
- Oxandrolone
- Oxatomide
- Oxazepam
- Oxazolidinones
- Oxcarbazepine
- Oxethazaine
- Oxfendazole
- Oxiconazole
- Oxybenzone
- Oxybutynin
- Oxycodone
- Oxymetazoline
- Oxymorphone
- Oxypurinol
- Oxytetracycline
- Oxytocin
- Ozagrel