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Medicines Beginning With O
12 medicines in the Drug Guide begin with the letter O. Every name links to a plain-language page covering what the medicine is for, its common side effects, its major cautions and — for most — a kidney note.
A B C D E F G H I K L M N O P Q R S T U V W Z
| Medicine | Brand names | Used for |
|---|---|---|
| Ofloxacin | Floxin | Eye infections (drops); Ear infections (drops) |
| Olanzapine | Zyprexa | Schizophrenia; Bipolar mania and maintenance |
| Olmesartan | Benicar | High blood pressure; Diabetic kidney protection (studied use, clinician-directed) |
| Omalizumab | Xolair | Moderate to severe allergic asthma not controlled by inhalers; Chronic hives |
| Omeprazole | Prilosec | Acid reflux and heartburn (GERD); Stomach and intestinal ulcers |
| Ondansetron | Zofran | Nausea and vomiting from chemotherapy, radiation, and surgery; Severe stomach flu and other nausea, on clinician judgment |
| Orlistat | Xenical, Alli | Weight management in obesity; Weight management in overweight patients with risk factors |
| Oseltamivir | Tamiflu | Treating influenza (flu); Preventing influenza after exposure |
| Oxcarbazepine | Trileptal | Seizure disorders; Seizures in adults and children (focal seizures) |
| Oxybutynin | Ditropan | Overactive bladder with urgency and leakage; Bladder spasms |
| Oxycodone | OxyContin, Roxicodone | Moderate to severe pain; Severe cancer and end-of-life pain, on specialist care |
| Oxymetazoline | Afrin | Nasal congestion from colds and allergies; Nosebleeds, as an aid in clinic settings |
Please note: This page is a patient-education summary, not medical advice, and it deliberately contains no doses. Medicines affect everyone differently — always follow your own prescription and talk to your doctor or pharmacist before starting, stopping or changing any medicine.