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Relenza contains zanamivir, a neuraminidase inhibitor. It blocks the neuraminidase enzyme on the surface of influenza A and B viruses, preventing newly formed viral particles from escaping infected cells and spreading to healthy tissue in the respiratory tract.

Relenza comes as a dry powder inhaled through a device called a Diskhaler. For treatment of flu in adults, the standard dose is two inhalations (10 mg total) twice daily for five days. For prevention, the dose schedule differs. Your prescribing physician will provide specific instructions.

Relenza is most effective when started within 48 hours of the onset of influenza symptoms such as fever, body aches, cough, or sore throat. Starting treatment early gives the medication the best chance of reducing symptom duration and severity.

Relenza is generally not recommended for patients with underlying airway diseases such as asthma or chronic obstructive pulmonary disease because inhaled zanamivir can trigger bronchospasm, which may be serious. If you have a lung condition, a physician will evaluate whether an alternative antiviral is safer for you.

Yes. Relenza is FDA-approved for post-exposure prophylaxis of influenza in adults and children aged 5 and older. It is also approved for community outbreak prevention. The dosing regimen for prevention is different from that used for treatment.

Common side effects include headache, diarrhea, nausea, nasal signs and symptoms, and bronchitis. Rare but serious adverse effects include bronchospasm and neuropsychiatric events such as confusion or abnormal behavior, particularly in pediatric patients. Contact a healthcare provider if you experience breathing difficulty or behavioral changes.

Doctronic uses an AI-powered evaluation to gather your symptom history and health information. A licensed, state-authorized physician then reviews your information, makes a clinical determination, and, if appropriate, creates a treatment plan that may include a prescription. Every prescription is doctor-reviewed and the process is HIPAA-compliant.

Yes. Doctronic's platform is staffed by licensed physicians, and all prescribing decisions are doctor-reviewed and audited for quality and safety. The service is HIPAA-compliant, protecting your personal health information. Doctronic is available to adults 18 and older in any U.S. state.