Tamiflu – Overview and Use

Tamiflu (oseltamivir) is an antiviral medication that suppresses and reduces the spread of influenza A and B viruses. It blocks the neuraminidase enzyme, preventing the virus from moving from infected cells to healthy ones. This action stops the production of toxins that cause severe flu symptoms and shortens the duration of illness by about one and a half days when treatment begins within 48 hours of symptom onset.

It can also be used as a prophylactic after close contact with an infected person, with a recommended dose of 75 mg once daily for 10 days.

Dosage and Administration

Treatment (adults and children ≥1 year): 75 mg taken orally twice daily for 5 days.

Prophylaxis (adults and children after exposure): 75 mg once daily for 10 days.

Pediatric dosing: Adjust the dose according to the child's weight.

Precautions

• Start treatment as soon as flu symptoms appear; do not stop early even if symptoms improve.
• Inform your healthcare provider of any kidney disease, heart disease, lung disease, neurological disorders, or other serious medical conditions.
• Use in children aged 1 year and older is approved; women who have recently given birth may also be prescribed Tamiflu.
• Vaccine considerations: Although flu vaccines may pose a theoretical risk to an unborn child, the risk of influenza infection is greater; your doctor will weigh the benefits.

Contraindications

• Hypersensitivity to any component of the formulation.
• Severe renal impairment requires dose adjustment for both treatment and prevention.

Side Effects

Common side effects include nausea, vomiting, diarrhea, bronchitis, abdominal pain, headache, and dizziness. Rare but serious reactions may involve sudden confusion, delirium, hallucinations, unusual behavior, or self‑injury. Allergic reactions and worsening of diabetes have also been reported.

Drug Interactions

Do not use a nasal influenza vaccine (FluMist) within 48 hours after taking Tamiflu. Provide your doctor with a complete list of all prescribed, over‑the‑counter, herbal, vitamin, and mineral products you are taking.

Missed Dose

Take the missed dose as soon as you remember. If it is less than two hours before your next scheduled dose, skip the missed dose and resume your regular schedule.

Overdose

Signs of overdose may include nausea and vomiting. Seek immediate medical attention if you suspect an overdose.

Storage

Store at room temperature between 20 °C and 25 °C (68 °F – 77 °F). Keep the medication away from moisture and heat.

Disclaimer

This information provides general guidance on Tamiflu and is not a substitute for professional medical advice. Dosage, treatment duration, and safety considerations must be confirmed by a qualified healthcare provider. Use of this medication without medical supervision is not recommended.