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Tamiflu – Oral Antiviral for Influenza (Rx)

Tamiflu (oseltamivir) is an oral antiviral medication used for the treatment and prevention of influenza A and B viruses. It belongs to the neuraminidase inhibitor class and works by blocking the influenza virus enzyme neuraminidase, which prevents the release of new viral particles from infected cells.

This action helps reduce viral spread in the body, potentially shortening illness duration and reducing symptom severity when started early.

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Key Details

• Active Ingredient: Oseltamivir
• Brand Name: Tamiflu
• Drug Class: Neuraminidase inhibitor (antiviral)
• Indication: Treatment and prevention of influenza A & B
• Mechanism of Action: Inhibits neuraminidase → blocks viral release and replication
• Route of Administration: Oral
• Prescription Status: Prescription-only medicine

Määrittelyt

• Dosage Forms:
  • Capsules
  • Oral suspension (liquid)
• Common Strengths: 30 mg, 45 mg, 75 mg capsules
• Standard Treatment Dose (adults):
  • 75 mg twice daily for 5 days
• Prophylaxis Dose:
  • 75 mg once daily (duration varies by exposure risk)
• Onset of Action: Most effective when started within 48 hours of symptom onset
• Metabolism: Hepatic conversion to active metabolite (oseltamivir carboxylate)
• Excretion: Renal
• Half-Life (active form): ~6–10 hours
• Storage: Room temperature (suspension may require refrigeration depending on brand)

Dosage & Administration

• Start treatment as soon as possible after flu symptoms begin
• Take with or without food (food may reduce nausea)
• Complete the full prescribed course even if symptoms improve
• Shake oral suspension well before use

Compatibility / Suitable Use

• Adults and children with confirmed or suspected influenza infection
• Individuals at high risk of complications (elderly, chronic illness, immunocompromised)
• Used for post-exposure prophylaxis in outbreak situations
• Must be prescribed by a healthcare professional

Adverse Effects

• Common: Nausea, vomiting, headache
• Less common: Abdominal pain, fatigue
• Rare: Skin reactions, neuropsychiatric symptoms

Why Choose Tamiflu?

Tamiflu is one of the most widely used oral antiviral treatments for influenza, offering convenient dosing and proven effectiveness when started early. It is commonly used for both treatment and prevention of seasonal flu outbreaks.