Valacyclovir / Acyclovir are doctor-prescribed antiviral drugs used to both treat and prevent outbreaks that occur on the mouth and/or genitals. Ingredients: valacyclovir [500 mg or 1 gram] or acyclovir [400 mg or 800 mg], carnauba wax, colloidal silicon dioxide, crospovidone, FD&C Blue No. 2 Lake, hypromellose, magnesium stearate, microcrystalline cellulose, polyethylene glycol, polysorbate 80, povidone, titanium dioxide