Oseltamivir Overview

Generic Name: Oseltamivir
Brand Name: Olpavir
Drug Class: Neuraminidase Inhibitors

Uses

Oseltamivir is an antiviral medication used to treat and prevent influenza (flu) caused by influenza virus types A and B. It is effective for:

• Treatment: In individuals 2 weeks of age and older who have had flu symptoms for 2 days or less.
• Prevention: In those who have been exposed to the flu but do not yet show symptoms.

Note: Oseltamivir will not treat the common cold.

Warnings

• Duration of Symptoms: Use oseltamivir for flu symptoms that have lasted less than 2 days.
• Monitoring: Watch for unusual behavior, confusion, or hallucinations, especially in children.
• Regulation: Avoid purchasing oseltamivir online or outside the U.S., as these sources may not follow FDA regulations and could contain dangerous ingredients.

Before Taking Oseltamivir

• Flu Shot: Oseltamivir is not a substitute for an annual flu shot, which is recommended by the CDC.
• Allergies: Do not use if allergic to oseltamivir.
• Age Restrictions:
  • Not recommended to prevent flu in children younger than 3 months.
  • Not recommended to treat flu in children younger than 2 weeks unless advised by a doctor.

Consult Your Doctor If You Have:

• Kidney disease or are on dialysis.
• Heart or chronic lung disease.
• Brain swelling or other neurological conditions.
• A weakened immune system.
• Hereditary fructose intolerance.
• Received a nasal flu vaccine (FluMist) in the past 2 weeks.

Pregnancy and Breastfeeding

• Pregnancy: The effects of oseltamivir on an unborn baby are not well-known, but flu during pregnancy can lead to complications. Consult your doctor.
• Breastfeeding: It’s unclear if oseltamivir passes into breast milk. Consult your doctor before use.

How to Take Oseltamivir

• Timing: Start as soon as flu symptoms appear.
• Dosage:
  • Treatment: Take every 12 hours for 5 days.
  • Prevention: Take every 24 hours for 10 days or as prescribed.
• Administration: Take with a full glass of water. It can be taken with food to prevent stomach upset. Shake the liquid form well before measuring.
• Full Course: Complete the entire prescribed course, even if symptoms improve.

Storage:

• Capsules: Store at room temperature away from moisture and heat.
• Liquid: Store in the refrigerator for up to 17 days or at cool room temperature for up to 10 days.

Missed Dose

• Take the missed dose as soon as possible unless your next dose is due in less than 2 hours. Do not double up doses.

Overdose

• Seek emergency medical attention or call the Poison Help line.

What to Avoid

• Do not use the nasal flu vaccine (FluMist) within 48 hours after taking oseltamivir.

Side Effects

Common Side Effects:

• Nausea
• Vomiting
• Headache
• Pain

Serious Side Effects (Seek Immediate Medical Attention):

• Allergic reactions (hives, breathing difficulty, swelling)
• Severe skin reactions (rash, blistering, peeling)
• Neurological symptoms (confusion, tremors, hallucinations, unusual behavior)

Drug Interactions

Inform your doctor of all medications, supplements, and herbal products you are using. Other drugs may interact with oseltamivir.

Reporting Side Effects: You can report side effects to the FDA.

Note: 

The brand name displayed above is specific to this product. Brand names can vary depending on the manufacturer.