This list includes 25 Pills that start with O, from “Octreotide” to “Oxycodone”. These entries cover common oral tablets and capsules used for pain, hormone, infection, and chronic conditions.
Pills that start with O are medicines whose names begin with the letter O and are taken orally. Notable examples include oxycodone, a widely discussed opioid, and octreotide, used in hormone regulation.
Below you’ll find the table with Name, Generic/Brand, Primary use, Therapeutic class, Common side effects, Formulation, References.
Name: The medication’s common name as you’ll see on labels, helping you identify the pill quickly.
Generic/Brand: Indicate whether the name is generic or a brand, so you can match prescriptions and packaging.
Primary use: Brief statement of the main medical purpose, so you know why someone takes the pill.
Therapeutic class: The drug class shows related medicines and mechanisms, helping you quickly understand treatment context and comparisons.
Common side effects: List of three to six frequent adverse effects so you recognize, monitor, and manage expected reactions.
Formulation: Shows tablet or capsule strengths and forms so you know what to look for at the pharmacy.
References: Short links to official prescribing information and databases that let you check dosage, warnings, and label details.
Pills that start with O
| Name | Brand/Generic | Formulation | Primary use |
|---|---|---|---|
| Olanzapine | Generic: Zyprexa | Tablet | Treating schizophrenia and bipolar disorder. |
| Omeprazole | Generic: Prilosec, Prilosec OTC | Capsule | Treating heartburn, GERD, and stomach ulcers. |
| Ondansetron | Generic: Zofran | Tablet | Preventing nausea and vomiting from chemotherapy, radiation, or surgery. |
| Oseltamivir | Generic: Tamiflu | Capsule | Treating or preventing influenza (the flu). |
| Oxycodone | Generic: Roxicodone, OxyContin | Tablet | Managing moderate to severe pain. |
| Oxybutynin | Generic: Ditropan XL | Tablet | Treating overactive bladder and urinary incontinence. |
| Oxcarbazepine | Generic: Trileptal, Oxtellar XR | Tablet | Treating certain types of seizures in epilepsy. |
| Olmesartan | Generic: Benicar | Tablet | Treating high blood pressure (hypertension). |
| Orlistat | Generic: Xenical, Alli (OTC) | Capsule | Aiding in weight loss for overweight or obese individuals. |
| Otezla | Brand: apremilast | Tablet | Treating psoriatic arthritis and plaque psoriasis. |
| Omnicef | Brand: cefdinir | Capsule | Treating bacterial infections like bronchitis, pneumonia, and sinus infections. |
| Opana ER | Brand: oxymorphone | Tablet | Managing severe, long-term pain requiring daily treatment. |
| Oracea | Brand: doxycycline | Capsule | Treating inflammatory bumps and blemishes of rosacea. |
| Ofev | Brand: nintedanib | Capsule | Treating idiopathic pulmonary fibrosis (IPF) and other lung diseases. |
| Oxazepam | Generic: Serax | Capsule | Managing anxiety or symptoms of alcohol withdrawal. |
| Odefsey | Brand: emtricitabine, rilpivirine, tenofovir alafenamide | Tablet | Treating HIV-1 infection in adults and children. |
| Orkambi | Brand: lumacaftor, ivacaftor | Tablet | Treating cystic fibrosis (CF) in patients with a specific gene mutation. |
| Onfi | Brand: clobazam | Tablet | Treating seizures associated with Lennox-Gastaut syndrome. |
| Onglyza | Brand: saxagliptin | Tablet | Improving blood sugar control in adults with type 2 diabetes. |
| Orilissa | Brand: elagolix | Tablet | Managing moderate to severe pain associated with endometriosis. |
| Olumiant | Brand: baricitinib | Tablet | Treating moderate to severe rheumatoid arthritis and alopecia areata. |
| Orphenadrine | Generic: Norflex | Tablet | Relieving muscle spasms and pain. |
| Ospemifene | Brand: Osphena | Tablet | Treating moderate to severe painful intercourse due to menopause. |
| Octreotide | Generic: Mycapssa | Capsule | Treating acromegaly, a hormonal disorder of excess growth hormone. |
| Olsalazine | Generic: Dipentum | Capsule | Maintaining remission of ulcerative colitis. |
Descriptions
Olanzapine
An atypical antipsychotic used for serious mental health conditions. Common side effects include drowsiness, weight gain, dizziness, constipation, and dry mouth.
Omeprazole
A proton pump inhibitor (PPI) that reduces stomach acid. Often used for acid reflux. Common side effects include headache, stomach pain, nausea, and diarrhea.
Ondansetron
An antiemetic (anti-nausea) medication that blocks serotonin to prevent vomiting. Common side effects include headache, constipation, drowsiness, and fatigue.
Oseltamivir
An antiviral drug that helps shorten the duration of flu symptoms if started within 48 hours. Side effects can include nausea, vomiting, and headache.
Oxycodone
A strong opioid pain reliever with a high potential for dependence. Common side effects include drowsiness, constipation, dizziness, nausea, and headache.
Oxybutynin
An antispasmodic that relaxes the bladder muscle to reduce the urge to urinate. Common side effects include dry mouth, dizziness, constipation, and blurred vision.
Oxcarbazepine
An anticonvulsant medication used to control seizures. It can cause dizziness, drowsiness, headache, nausea, and double vision.
Olmesartan
An angiotensin II receptor blocker (ARB) that relaxes blood vessels, lowering blood pressure. The most common side effect is dizziness.
Orlistat
A lipase inhibitor that prevents the absorption of some fat from your diet. Side effects are often gut-related, like oily stools, gas, and stomach upset.
Otezla
A PDE4 inhibitor that helps reduce inflammation associated with certain autoimmune conditions. Common side effects include diarrhea, nausea, headache, and upper respiratory infection.
Omnicef
A cephalosporin antibiotic that stops the growth of bacteria. The most common side effect is diarrhea. It can also cause nausea and stomach pain.
Opana ER
A powerful, extended-release opioid analgesic. It carries a high risk of addiction and can cause drowsiness, constipation, nausea, and dizziness.
Oracea
A low-dose antibiotic from the tetracycline class, used for its anti-inflammatory effects. It can cause nausea, diarrhea, and increased sensitivity to sunlight.
Ofev
A kinase inhibitor that helps slow the progression of scarring in the lungs. Common side effects include diarrhea, nausea, stomach pain, and vomiting.
Oxazepam
A benzodiazepine medication that slows down activity in the brain. It can be habit-forming. Common side effects include drowsiness, dizziness, and headache.
Odefsey
A complete, single-tablet regimen for HIV. This antiretroviral combination therapy can cause headache, trouble sleeping, fatigue, and nausea.
Orkambi
A CFTR modulator that helps a defective protein work better. Common side effects include shortness of breath, nausea, diarrhea, and upper respiratory tract infection.
Onfi
A benzodiazepine used as an add-on therapy for a severe form of epilepsy. It can cause sleepiness, drooling, fever, constipation, and fatigue.
Onglyza
A DPP-4 inhibitor that helps increase insulin levels after a meal. Common side effects include upper respiratory tract infection, urinary tract infection, and headache.
Orilissa
A GnRH antagonist that lowers estrogen levels to reduce endometriosis pain. Side effects can include hot flashes, headache, nausea, and mood changes.
Olumiant
A Janus kinase (JAK) inhibitor that reduces inflammation. It can increase the risk of infections. Common side effects include nausea, cold sores, and shingles.
Orphenadrine
A muscle relaxant that works by blocking certain nerve impulses in the brain. Often used with rest and physical therapy. Can cause dry mouth, drowsiness, and dizziness.
Ospemifene
A selective estrogen receptor modulator (SERM) that acts like estrogen on vaginal tissue. Side effects may include hot flashes, vaginal discharge, and muscle spasms.
Octreotide
A somatostatin analog that lowers levels of growth hormone. Mycapssa is the oral form. Side effects include nausea, diarrhea, headache, and joint pain.
Olsalazine
An anti-inflammatory drug that works directly in the colon to reduce swelling. Its most common side effect is diarrhea. Others include headache and rash.