Valtrex Ingredients and Composition
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Valtrex Ingredients and Composition
Valtrex (valacyclovir hydrochloride) is the hydrochloride salt of L-valyl ester of the antiviral drug acyclovir (Zovirax Brand, GlaxoSmithKline).
Valtrex Caplets are for oral administration. Each caplet contains valacyclovir hydrochloride equivalent to 500 mg or 1 gram valacyclovir and the inactive ingredients carnauba wax, colloidal silicon dioxide, crospovidone, FD&C Blue No. 2 Lake, hydroxypropyl methylcellulose, magnesium stearate, microcrystalline cellulose, polyethylene glycol, polysorbate 80, povidone, and titanium dioxide. The blue, film-coated caplets are printed with edible white ink.
The chemical name of valacyclovir hydrochloride is L-valine, 2-[(2-amino-1,6-dihydro-6-oxo- 9H-purin-9-yl)methoxy]ethyl ester, monohydrochloride.
Valacyclovir hydrochloride, the active ingredient in Valtrex, is a white to off-white powder with the molecular formula C13H20N6O4•HCl and a molecular weight of 360.80. The maximum solubility in water at 25°C is 174 mg/mL. The pka's for valacyclovir hydrochloride are 1.90, 7.47, and 9.43.
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