How many packets of oseltamivir should an adult take at one time?

Generally, the number of oseltamivir packets an adult should take depends on the purpose of use and the drug's specifications. For treatment, it is usually 3 to 5 packets; for prevention, it is typically 3 packets. If in doubt, it is recommended to consult a doctor in advance. The detailed analysis is as follows:

When used to treat influenza A or B, adults should take 75 mg per dose. If the packet specification is 15 mg per sachet, 5 sachets should be taken at once; if the specification is 25 mg per sachet, 3 sachets should be taken at once. This dose should be taken twice daily for five consecutive days, and treatment should begin within 48 hours of symptom onset.

When used for influenza prevention, adults should also take 75 mg per dose. Accordingly, 5 sachets are required for the 15 mg per sachet formulation, and 3 sachets for the 25 mg per sachet formulation. The dose should be taken once daily for at least seven consecutive days, and prophylactic treatment should start within 48 hours after close contact with an infected individual.

Before taking the medication, confirm the correct dosage form and your specific needs. Do not adjust the dose or alter the treatment course without medical advice. Inform your doctor promptly if you experience adverse effects such as nausea or vomiting to ensure safe medication use.