Table 2. Examples of inhibitory concentrations of antiviral drugs against selected viruses^a.

Compound	IC50	Virus
Foscavir	50–800 μM	Cytomegalovirus
	5–443 μM	Herpes simplex mutants
Acyclovir	0.01–13.5 μg/ml	Herpes smplex virus and varicella-zoster virus
Cymevene	0.02–3.48 μg/mL	Laboratory strains or clinical isolates of cytomegalovirus
Ribavirin	1–25 μg/mL	Influenza
	25–100 μg/mL	HIV and other retroviruses
	3.2–50 μg/ml (MIC)	Herpes and poxviruses suppression
Lamivudine	0.0006–0.034 μg/mL	HIV
Zidovudine	0.003–0.013 μg/mL	HIV
Fortovase	1–30 nM	HIV
Viracept	7–196 nM (EC95)	HIV
Crixivan	25–100 nM	HIV
Relenza	0.005–16 μM	Influenza virus
Tamiflu	0.0008 μM–>35 μM	Influenza virus
Amantadine	0.1–25 (ED50)	Influenza virus

^aIC₅₀, 50% inhibitory concentration; EC₉₅, 95% effective concentration; ED₅₀, 50% effective dose.