Antiviral agent		Age group (years)
		1 to 6	7 to 9	10 to 12	13 to 64	65 and older
Amantidine (Symmetrel)*
Treatment of influenza A		5 mg per kg per day, up to 150 mg per day in 2 divided doses†	5 mg per kg per day, up to 150 mg per day in 2 divided doses†	100 mg twice daily‡	100 mg twice daily‡	≤ 100 mg daily
Prophylaxis of influenza A		5 mg per kg per day, up to 150 mg per day in 2 divided doses†	5 mg per kg per day, up to 150 mg per day in 2 divided doses†	100 mg twice daily‡	100 mg twice daily‡	≤ 100 mg daily
Rimantidine (Flumadine)§
Treatment of influenza A		—	—	—	100 mg twice daily‡¶	100 mg daily
Prophylaxis of influenza A		5 mg per kg per day, up to 150 mg per day in 2 divided doses†	5 mg per kg per day, up to 150 mg per day in 2 divided doses†	100 mg twice daily‡	100 mg twice daily‡	100 mg daily**
Zanamivir (Relenza)††
	Treatment of influenza A and B	—	10 mg twice daily	10 mg twice daily	10 mg twice daily	10 mg twice daily
Oseltamivir (Tamiflu)
Treatment of influenza A and B‡‡		Dosage varies by child’s weight§§	Dosage varies by child’s weight§§	Dosage varies by child’s weight§§	75 mg twice daily	75 mg twice daily
Prophylaxis of influenza A and B		—	—	—	75 mg daily	75 mg daily