Pill with imprint Y131 is Blue, Capsule-shape and has been identified as Valacyclovir Hydrochloride 500 mg. It is supplied by Yiling Pharmaceutical, Inc.

Valacyclovir is used in the treatment of Cold Sores; Herpes Simplex; Herpes Simplex, Mucocutaneous/Immunocompetent Host; Herpes Simplex, Suppression; CMV Prophylaxis and belongs to the drug class purine nucleosides. There is no proven risk in humans during pregnancy. Valacyclovir 500 mg is not a controlled substance under the Controlled Substances Act (CSA).