Descrizione

Relenza – Inhaled Antiviral for Influenza (Rx)

Relenza (zanamivir) is an antiviral medication used for the treatment and prevention of influenza A and B virus infections. It belongs to the neuraminidase inhibitor class and works by blocking the influenza virus enzyme neuraminidase, which prevents newly formed viral particles from being released from infected cells.

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This limits viral spread in the respiratory tract and can reduce the severity and duration of flu symptoms when started early.

Dettagli Chiave

• Active Ingredient: Zanamivir
• Brand Name: Relenza
• Drug Class: Neuraminidase inhibitor (antiviral)
• Indication: Treatment and prevention of influenza A & B
• Mechanism of Action: Inhibits neuraminidase → blocks viral release and spread
• Route of Administration: Inhalation (oral inhalation via Diskhaler device)
• Stato della prescrizione: Medicinali soggetti a prescrizione medica

Specifiche

• Dosage Form: Inhalation powder (blister packs)
• Administration Device: Diskhaler inhalation device
• Treatment Dose:
  • 10 mg (2 inhalations of 5 mg) twice daily for 5 days
• Prophylaxis Dose:
  • 10 mg once daily (duration varies by exposure risk)
• Onset of Action: Most effective when started within 48 hours of symptom onset
• Metabolism: Minimal systemic metabolism
• Excretion: Primarily unchanged via kidneys
• Systemic Exposure: Low due to localized respiratory delivery
• Storage: Room temperature, protected from moisture

Dosaggio e somministrazione

• Administer using Diskhaler inhalation device
• Begin treatment as early as possible after flu symptoms appear
• Complete full prescribed course even if symptoms improve
• Not suitable for patients unable to use inhalation device properly

Compatibilità / Utilizzo idoneo

• Patients with uncomplicated influenza A or B infection
• Individuals needing flu prevention after exposure
• Suitable for adults and children (per prescribing guidelines)
• Used when oral antivirals (e.g., oseltamivir) are not preferred or available

Controindicazioni

• Hypersensitivity to zanamivir or lactose (contains milk protein in some formulations)
• Not recommended for patients with severe asthma or chronic obstructive pulmonary disease (COPD) without close supervision

Avvertenze e precauzioni

• May cause bronchospasm, especially in patients with underlying respiratory disease
• Caution in asthma or COPD patients (may require bronchodilator support)
• Not a substitute for influenza vaccination
• Must be used early for best effectiveness

Adverse Effects

• Common: Cough, throat irritation, nasal symptoms
• Respiratory: Bronchospasm (rare but serious)
• Other: Headache, nausea
• Allergic reactions (rare)

Interazioni farmacologiche

• Minimal clinically significant drug interactions
• May be used with other supportive influenza treatments if needed
• Always inform healthcare provider of respiratory conditions

Why Choose Relenza?

Relenza offers a targeted inhaled antiviral option for influenza treatment and prevention. Its localized action in the respiratory tract helps reduce viral spread when used early, making it an effective option in seasonal flu management and outbreak control.