API Standards - O
- Obeticholic acid
- Oclacitinib
- Octenidine
- Octinoxate
- Octisalate
- Octocrylene
- Octreotide
- Octyl Gallate
- Odevixibat
- Ofloxacin
- Olanzapine
- Olaparib
- Oleic Acid
- Oleuropein
- Oliceridine
- Oligomer
- Olmesartan
- Olodaterol
- Olopatadine
- Olsalazine
- Olutasidenib
- Omadacycline
- Omaveloxolone
- Omeprazole
- Omidenepag Isopropyl
- Ondansetron
- Opicapone
- Opipramol
- Orbifloxacin
- Orciprenaline
- Orforglipron
- Orientin
- Oritavancin
- Orlistat
- Ormeloxifene
- Ornidazole
- Ornithine
- Orotic Acid
- Orphenadrine
- Oseltamivir
- Osilodrostat
- Osimertinib
- Ospemifene
- Oteracil
- Oteseconazole
- Otilonium Bromide
- Oxacillin
- Oxaliplatin
- Oxandrolone
- Oxaprozin
- Oxazepam
- Oxcarbazepine
- Oxeladin
- Oxethazaine
- Oxfendazole
- Oxiconazole
- Oxiracetam
- Oxitropium bromide
- Oxolamine
- Oxomemazine
- Oxprenolol
- Oxybenzone
- Oxybutynin
- Oxychlordane
- Oxyclozanide
- Oxycodone
- Oxymetazoline
- Oxymetholone
- Oxymorphone
- Oxyphenbutazone
- Oxyphencyclimine
- Oxyquinoline Sulfate
- Oxytetracycline
- Oxytocin
- Ozanimod
- Ozenoxacin