See the DrugPatentWatch profile for Tamiflu
The patent for Tamiflu (oseltamivir phosphate) expired in the United States in 2016, making the drug available for generic versions [1].
When can generic Tamiflu become available?
With the expiration of the primary patents, generic versions of oseltamivir phosphate can be manufactured and sold [1]. This allows for increased competition and potentially lower prices for the antiviral medication used to treat and prevent influenza.
Who makes generic Tamiflu?
Following the patent expiry, various pharmaceutical companies have the opportunity to produce and market generic oseltamivir phosphate. Companies interested in manufacturing generic drugs typically seek approval from regulatory bodies, such as the U.S. Food and Drug Administration (FDA), before releasing their products [1].
What is the difference between brand-name Tamiflu and generic oseltamivir?
Generic medications contain the same active ingredient as their brand-name counterparts and are proven to be as safe and effective [1]. The primary differences are typically in inactive ingredients, such as fillers or dyes, and of course, price. Generic Tamiflu is generally less expensive than the brand-name version.
What are the active ingredients in Tamiflu?
The active ingredient in Tamiflu is oseltamivir phosphate [1]. This is a neuraminidase inhibitor that works by preventing the influenza virus from spreading within the body.
How effective is Tamiflu for influenza?
Tamiflu is prescribed to treat influenza A and B in adults and children. It can reduce the duration of flu symptoms by about one day and may help prevent serious flu complications, such as pneumonia [2]. It is most effective when started within 48 hours of symptom onset [2].
What are the side effects of Tamiflu?
Common side effects of Tamiflu include nausea, vomiting, headache, and abdominal pain [2]. Less common but more serious side effects have been reported, including allergic reactions, skin reactions, and neurological or behavioral symptoms [2].
What is the mechanism of action for oseltamivir phosphate?
Oseltamivir phosphate is a prodrug that is converted in the body to its active form, oseltamivir carboxylate [1]. This active form is a selective inhibitor of the influenza virus neuraminidase enzyme. By inhibiting this enzyme, oseltamivir carboxylate prevents the release of new virus particles from infected cells, thereby reducing viral spread [1].
What other antiviral medications are available for influenza?
Other antiviral drugs approved for the treatment and prevention of influenza include baloxavir marboxil (Xofluza), zanamivir (Relenza), and peramivir (Rapivab) [3]. Each has a different mechanism of action and prescribing guidelines.
How is Tamiflu regulated?
Tamiflu is regulated by health authorities like the U.S. Food and Drug Administration (FDA) [1]. These agencies review safety and efficacy data before approving drugs for marketing and monitor their performance post-approval. The availability of generic versions also falls under regulatory oversight to ensure bioequivalence.
Sources:
[1] DrugPatentWatch.com
[2] National Institute of Allergy and Infectious Diseases
[3] Centers for Disease Control and Prevention