See the DrugPatentWatch profile for metoprolol
Metoprolol succinate, the active ingredient in many extended-release formulations, is combined with several inactive ingredients to create the final tablet or capsule [1]. These inactive ingredients, also known as excipients, serve various purposes, including binding the drug together, facilitating its release, and improving its stability [2].
What inactive ingredients are in metoprolol succinate tablets?
Common inactive ingredients found in metoprolol succinate extended-release tablets include microcrystalline cellulose, which acts as a binder and filler, and hypromellose, a cellulose derivative that forms the controlled-release coating [1][3]. Other excipients may include polyethylene glycol, used to enhance drug dissolution and stability, and various types of magnesium stearate or calcium stearate, which function as lubricants to prevent the tablet ingredients from sticking to manufacturing equipment [1][3]. The specific combination and quantity of these inactive ingredients can vary between different manufacturers and formulations [2].
How does metoprolol succinate's formulation affect its release?
The extended-release formulation of metoprolol succinate is designed to release the medication gradually over a period of 24 hours, allowing for once-daily dosing [4]. This controlled release is achieved through the use of specific polymers, such as hypromellose, which form a matrix or coating around the drug particles. As the tablet or capsule disintegrates in the gastrointestinal tract, these polymers swell or dissolve slowly, thereby controlling the rate at which metoprolol succinate is released into the bloodstream [3][4]. This sustained release helps maintain consistent therapeutic drug levels, reducing the frequency of dosing and potentially minimizing peak-and-trough fluctuations that can be associated with immediate-release formulations [4].
Are there different types of metoprolol succinate medications?
Yes, metoprolol succinate is available in various dosage strengths and forms. It is primarily formulated as extended-release tablets, with strengths typically ranging from 25 mg to 200 mg [5]. These are distinct from metoprolol tartrate, which is an immediate-release form of the same drug and requires more frequent dosing [6]. While both contain the active ingredient metoprolol, their pharmacokinetic profiles differ significantly due to the formulation [4][6].
What are the most common uses for metoprolol succinate?
Metoprolol succinate is a beta-blocker medication prescribed to treat a range of cardiovascular conditions. Its primary uses include managing high blood pressure (hypertension), treating angina (chest pain), and improving survival after a heart attack [7]. It is also used to manage heart failure, often in conjunction with other medications, to reduce the risk of hospitalization and death [7].
Who manufactures metoprolol succinate?
Metoprolol succinate is available as both a brand-name drug, Toprol XL, and as a generic medication [5]. Numerous pharmaceutical companies produce generic versions of metoprolol succinate, making it widely accessible. Specific manufacturers can be identified by checking product labeling or consulting with a pharmacist [8].
Sources:
[1] https://www.drugpatentwatch.com/drug/metoprolol-succinate
[2] https://www.ncbi.nlm.nih.gov/books/NBK557811/
[3] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4579677/
[4] https://www.drugpatentwatch.com/blog/what-is-metoprolol-succinate
[5] https://www.goodrx.com/metoprolol-succinate
[6] https://www.drugpatentwatch.com/blog/metoprolol-tartrate-vs-metoprolol-succinate
[7] https://www.nhs.uk/medicines/metoprolol/
[8] https://www.mayoclinic.org/drugs-supplements/metoprolol-oral-route/description/drg-20064515