Valacyclovir is an antiviral drug and a prodrug of acyclovir. It is used for the same indications—such as shingles, cold sores, and genital herpes—but offers greater bioavailability, allowing for less frequent dosing.

Acyclovir is an antiviral medication primarily used to treat infections caused by the herpes simplex virus (HSV), including cold sores and genital herpes, as well as the varicella-zoster virus, which causes chickenpox and shingles.

Pregabalin is an anticonvulsant and analgesic medication used to treat neuropathic pain, fibromyalgia, and as an adjunctive therapy for partial seizures.