Comprehensive medication guide to Oseltamivir including estimated pricing, availability information, side effects, and how to find it in stock at your local pharmacy.
Estimated Insurance Pricing
Most insured patients pay a $10–$75 copay, with about 68% of plans covering oseltamivir.
Estimated Cash Pricing
Generic oseltamivir costs $25–$55 with a coupon, while brand-name Tamiflu runs $175–$200 for a standard 10-capsule course.
Medfinder Findability Score
55/100
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Oseltamivir (brand name Tamiflu) is an antiviral medication used to treat and prevent influenza A and B. It belongs to a class of drugs called neuraminidase inhibitors. The FDA has approved oseltamivir for treating acute, uncomplicated flu in patients 2 weeks and older who have been symptomatic for no more than 48 hours, and for flu prevention (prophylaxis) in patients 1 year and older. It is also used off-label for avian influenza strains like H5N1 and H7N9.
Oseltamivir works by inhibiting the neuraminidase enzyme on the surface of influenza viruses. This enzyme is responsible for releasing newly formed viral particles from infected cells. By blocking neuraminidase, oseltamivir prevents the virus from spreading to new cells in your body, reducing the severity and duration of flu symptoms — typically shortening illness by about one to two days when started early.
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Oral capsules
30 mg, 45 mg, 75 mg
Oral suspension — suspension
6 mg/mL powder for reconstitution
Oseltamivir currently has a findability score of 55 out of 100, reflecting intermittent supply challenges. The ASHP has listed an active shortage as of January 2026, with multiple generic manufacturers reporting back orders due to the severe 2025–2026 flu season. Some capsule strengths and the oral suspension are particularly affected. You may need to call several pharmacies or ask your pharmacist about alternative strengths or forms.
Oseltamivir is commonly prescribed by a wide range of healthcare providers, including:
It is also widely available through telehealth platforms, making it convenient to get a prescription without an in-person visit during flu season.
No, oseltamivir is not a controlled substance. It has no DEA scheduling and does not carry any risk of abuse or dependence. It can be prescribed and dispensed without the additional restrictions that apply to controlled medications.
Taking oseltamivir with food can help reduce nausea. In rare cases, serious side effects may occur, including neuropsychiatric events (abnormal behavior, delirium, hallucinations) — primarily reported in pediatric patients — severe allergic reactions, and elevated liver enzymes.
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Baloxavir marboxil (Xofluza)
A single-dose oral antiviral that works differently by inhibiting cap-dependent endonuclease. Approved for patients 5 years and older.
Zanamivir (Relenza)
An inhaled neuraminidase inhibitor for treatment (ages 7+) and prevention (ages 5+). Not recommended for patients with respiratory conditions like asthma or COPD.
Peramivir (Rapivab)
An IV neuraminidase inhibitor given as a single-dose infusion, typically in hospital settings. Approved for patients 6 months and older.
Prefer Oseltamivir? We can find it.
Live attenuated influenza vaccine (FluMist)
moderateOseltamivir may reduce the effectiveness of this nasal spray flu vaccine. Avoid use 2 weeks before to 48 hours after receiving LAIV.
Probenecid
moderateMay increase oseltamivir levels in the blood, though this is rarely clinically significant.
Warfarin
moderateINR should be monitored, though significant interactions are rare.
Oseltamivir remains one of the most widely prescribed antiviral medications for influenza and is a critical tool during flu season. While the 2025–2026 flu season has created supply challenges, generic versions are available from multiple manufacturers and prices are reasonable with coupon cards. If your pharmacy is out of stock, try using Medfinder to locate availability nearby, ask about the oral suspension as an alternative, or consider asking your doctor about Xofluza as a single-dose alternative.
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