List of Medicines K | List of Medicines L | List of Medicines M | List of Medicines N |
| Octreotide | Octreotide is an octapeptide that mimics natural somatostatin pharmacologically, though it is a more potent inhibitor of growth |
| Ofloxacin | Ofloxacin is a fluoroquinolone antibiotic |
| Olanzapine | Olanzapine is an atypical antipsychotic |
| Omeprazole | Omeprazole is a proton pump inhibitor used in the treatment of dyspepsia, peptic ulcer disease (PUD), gastroesophageal reflux disease (GORD/GERD) and Zollinger-Ellison syndrome |
| Ondansetron | Ondansetron is a serotonin 5-HT3 receptor antagonist used mainly as an antiemetic |
| Orciprenaline | Orciprenaline is a bronchodilator |
| Orlistat | It is a drug designed to treat obesity |
| Ormeloxifene | Ormeloxifene is one of the selective estrogen receptor modulators, or SERMs |
| Ornidazole | Ornidazole is a drug that cures some protozoan infections |
| Orphenadrine | Orphenadrine is an anticholinergic drug of the ethanolamine antihistamine |
| Oxaliplatin | Oxaliplatin is a platinum-based cancer chemotherapy drug |
| Oxazepam | Oxazepam is a drug which is a benzodiazepine derivative |
| Oxcarbazepine | Oxcarbazepine is an anticonvulsant and mood stabilizing drug, used primarily in the treatment of epilepsy |
| Oxiconazole | Oxiconazole is an antifungal agent |
| Oxprenolol | Oxprenolol is a non-selective beta blocker with some intrinsic sympathomimetic activity |
| Oxybutynin | Oxybutynin is an anticholinergic medication |
| Oxyfedrine | Oxyfedrine is a vasodilator |
| Oxymetazoline | Oxymetazoline is an adrenergic used as the hydrochloride salt as a vasoconstrictor to reduce nasal or conjunctival congestion |
| Oxyphenonium | |
| Oxytetracycline | Oxytetracycline is a broad-spectrum tetracycline group of antibiotic |
| Oxytocin | Oxytocin is a hormone that also acts as a neurotransmitter in the brain |
| Ofloxacin + Tinidazole | |
| Olopatadine | Olopatadine is an antihistamine |
| Omeprazole + Domperidone | |
| Olmesartan Medoxomil | Olmesartan medoxomil is an angiotensin II receptor antagonist used to treat high blood pressure |
| Oseltamivir | Oseltamivir, an anti-viral drug |
| Oxycodone | Oxycodone, a narcotic analgesic |
| Omega-3 triglycerides | Omega-3 triglycerides are one of the ethyl esters of polyunsaturated fatty acids is used to treat or reduce circulatory levels of triglycerides |
| Ofloxacin + Ornidazole | Ofloxacin + Ornidazole, a combined formulation of antibiotics, are prescribed for the treatment of peridonitis, diarrhoea, dysentery, gingivitis and pelvic inflammatory disease. |
| Omega-3 fatty acid | Omega-3 fatty acid is indicated for the treatment of omega-3 fatty acid deficiency associated with cardiovascular disorders and hypertriglyceridemia |
| Oxatomide | Oxatomide, a piperazine derivative, is indicated as a systemic anti-histaminic drug to treat allergies |
List of Medicines K | List of Medicines L | List of Medicines M | List of Medicines N |