Agent	Types of influenza viruses inhibited	Route of administration	Dosage	Cost* (daily)	Cost* (five-day regimen)
Amantadine (Symmetrel)	A	Oral (tablet, capsule, syrup)	200 mg as a single dose or 100 mg twice daily†	$ 1.96	$ 9.82
Rimantadine (Flumadine)	A	Oral (tablet, syrup)	100 mg twice daily†	3.78	18.90
Zanamivir (Relenza)	A and B	Oral inhalation‡	2 inhalations (one 5-mg blister per inhalation for a total dose of 10 mg) twice daily	8.88	44.00
Oseltamivir (Tamiflu)	A and B	Oral (capsule)	75 mg twice daily§	$10.60	$53.00