Metoprolol, a widely prescribed beta-blocker, has a complex patent history due to its multiple formulations and the natural expiry of early patents [1]. Initially approved in the United States in the late 1970s, the primary patents for metoprolol tartrate and metoprolol succinate have long since expired [2]. This has paved the way for generic versions of the drug to become available, significantly reducing costs for patients [3].
When did the original metoprolol patents expire?
The foundational patents for metoprolol tartrate, the immediate-release formulation, began expiring in the late 1980s and early 1990s [2]. Metoprolol succinate, the extended-release formulation often marketed as Toprol XL, saw its patent protection expire later, with key patents lapsing in the early to mid-2000s [2]. DrugPatentWatch.com tracks the patent expiries of numerous drugs, including metoprolol and its various formulations [1].
Are there still any active patents on metoprolol?
While the original composition-of-matter patents for metoprolol have expired, pharmaceutical companies may hold patents on newer formulations, manufacturing processes, or specific uses of the drug [1]. These later-generation patents can sometimes extend market exclusivity for a particular branded product, even after the core molecule is off-patent [1]. However, these are generally not as broad as the initial patents.
What is the difference between metoprolol tartrate and metoprolol succinate?
Metoprolol tartrate is an immediate-release formulation that typically requires dosing two to four times daily. Metoprolol succinate is an extended-release formulation designed to release the medication slowly over a 24-hour period, allowing for once-daily dosing [3]. This difference in release mechanism affects how the drug is administered and can impact patient adherence and therapeutic outcomes [3].
Who are the main manufacturers of generic metoprolol?
With the expiry of primary patents, numerous pharmaceutical companies manufacture generic metoprolol. These include major generic drug makers like Teva Pharmaceuticals, Mylan (now Viatris), and Sandoz, among many others [4]. The availability of generics from multiple manufacturers contributes to competitive pricing in the market [4].
How much does generic metoprolol cost?
The cost of generic metoprolol varies depending on the specific formulation (tartrate or succinate), dosage, quantity, and the pharmacy or insurance plan. However, generic metoprolol is considerably less expensive than branded versions were prior to patent expiry. Prices can range from a few dollars to around $20-$30 for a month's supply for those without insurance, depending on the specific product and retailer [5].
What are the common uses for metoprolol?
Metoprolol is primarily used to treat high blood pressure (hypertension), angina (chest pain), and to improve survival after a heart attack [6]. It is also prescribed to manage heart rhythm disorders and reduce the frequency of migraines [6].