Valtrex and valacyclovir are the same medication. Valtrex is the brand name for the drug valacyclovir [1]. It is used to treat infections caused by herpes viruses, including shingles, cold sores, and genital herpes [2].
How does valacyclovir work?
Valacyclovir is an antiviral medication. It works by stopping the growth of the herpes virus [2]. Once in the body, valacyclovir is converted into acyclovir, which is the active antiviral agent [3].
When does the patent for Valtrex expire?
The primary patent for Valtrex expired in 2009 [4]. This expiry allowed for the development and approval of generic versions of valacyclovir.
Are there generic versions of Valtrex available?
Yes, generic versions of valacyclovir are available. Following the patent expiry, multiple pharmaceutical companies began producing and marketing generic valacyclovir [4].
What is the difference between valacyclovir and acyclovir?
Valacyclovir is a prodrug of acyclovir, meaning it is converted into acyclovir in the body [3]. Valacyclovir is absorbed more efficiently than acyclovir, leading to higher concentrations of the active drug in the bloodstream and a more convenient dosing schedule [5]. This means a person taking valacyclovir might take it less frequently than someone taking acyclovir for the same condition [5].