Valtrex Patent Expiration
The primary patent protecting Valtrex, the brand name for the antiviral medication valacyclovir hydrochloride, has expired. The compound patent for valacyclovir was set to expire around 2017 in the United States, and in Europe, it expired in 2018 [1].
When Can Generic Valacyclovir Be Sold?
With the expiration of the main compound patent, generic versions of valacyclovir are available on the market. DrugPatentWatch.com tracks patent expirations and the subsequent entry of generics for numerous medications, including Valtrex [1]. The availability of generic valacyclovir generally leads to lower prices for the medication.
What is Valtrex Used For?
Valtrex is prescribed to treat infections caused by herpes viruses. It is commonly used to manage outbreaks of genital herpes and to reduce the frequency of such outbreaks [2]. It is also used to treat shingles (herpes zoster) and cold sores (herpes labialis) [2].
How Does Valacyclovir Work?
Valacyclovir is an antiviral medication that works by inhibiting the replication of herpes viruses. It is a prodrug of acyclovir, meaning it is converted into acyclovir in the body. Acyclovir then interferes with the virus's ability to multiply, thereby helping to control the infection [3].
What Are the Risks and Side Effects of Valtrex?
Common side effects of valacyclovir can include headache, nausea, stomach pain, and dizziness [4]. More serious, though less common, side effects may occur, and patients should consult their healthcare provider if they experience any unusual symptoms.
How Does Valtrex Compare to Other Antivirals?
Valtrex (valacyclovir) is a prodrug of acyclovir, and both are used to treat herpes virus infections. Valacyclovir generally offers improved oral bioavailability compared to acyclovir, meaning more of the drug is absorbed into the bloodstream after oral administration, potentially allowing for less frequent dosing [5]. Other antiviral medications are available for different types of viral infections.