There are currently no generic Relenza (zanamivir) products available on the market. The next patent for the drug is set to expire in July 2014, so it's possible that a generic version could be introduced then. Although some companies may claim to currently sell generic Relenza, these medications could be fake, substandard, and potentially dangerous.
Generic Relenza: An OverviewRelenza® (zanamivir) is a prescription flu medicine. It is used to both treat and prevent cases of the flu caused by type A and type B influenza viruses.
Relenza is manufactured by GlaxoSmithKline. It is currently under the protection of a patent that prevents any generic Relenza from being manufactured in the United States. However, if you search the Internet for "generic Relenza," you may find a number of companies selling it.
The fact is that these medicines could be fake, substandard, and potentially dangerous. Generic Relenza may be available from another country, but there is really no way of knowing if you are getting genuine Relenza or not. Therefore, you should not buy any generic Relenza until there is an approved version available.
When Will Generic Relenza Be Available?
The first patent for Relenza expired in July 2013. Yet, no generic version is available. This suggests that one or more patents may still be providing protection against generic competition. The next patents will expire in July 2014. This is the earliest possible date that a generic version of the drug could become available.
However, other circumstances could come up to extend the exclusivity period beyond 2014. This could include things such as other patents for specific Relenza uses or lawsuits. Once the drug goes off-patent, several companies will likely begin manufacturing a generic Relenza drug.