Metoprolol is a medication primarily prescribed to treat a range of cardiovascular conditions. It belongs to a class of drugs known as beta-blockers, which work by affecting the body's response to certain nerve impulses, particularly in the heart [1].
Why is Metoprolol Prescribed?
Metoprolol is used to manage high blood pressure (hypertension), chest pain (angina), and to improve survival after a heart attack [1]. It can also be used to treat heart failure, although it may be initiated at a low dose and gradually increased in such cases [2]. Additionally, it is sometimes prescribed to manage irregular heart rhythms like atrial fibrillation and to reduce the frequency of migraines [1].
How Does Metoprolol Work in the Heart?
As a beta-blocker, metoprolol selectively blocks the effects of adrenaline and noradrenaline on beta-1 adrenergic receptors, which are predominantly found in the heart [3]. By blocking these receptors, metoprolol slows down the heart rate, reduces the force of the heart's contractions, and lowers blood pressure [1][3]. This reduces the workload on the heart, which is beneficial in conditions like angina and heart failure [2].
What Are the Common Side Effects of Metoprolol?
Common side effects associated with metoprolol use can include fatigue, dizziness, slow heart rate (bradycardia), and cold extremities [1]. Some individuals may also experience gastrointestinal issues like nausea or diarrhea, and less commonly, shortness of breath [1].
How Does Metoprolol Compare to Other Beta-Blockers?
Metoprolol is a cardioselective beta-blocker, meaning it primarily affects beta-1 receptors in the heart. Other beta-blockers may be non-selective, affecting both beta-1 and beta-2 receptors, which can lead to different side effect profiles, such as bronchoconstriction in individuals with asthma [3]. Some beta-blockers also have additional properties, like intrinsic sympathomimetic activity or alpha-blocking effects, which differentiate them from metoprolol [3].
When Does Metoprolol Go Off Patent?
Information regarding the patent status of metoprolol is publicly available on resources like DrugPatentWatch.com. As metoprolol is an older medication, its original patents have long expired, allowing for the widespread availability of generic versions [4]. This has significantly reduced the cost of the medication.
Who Manufactures Generic Metoprolol?
Numerous pharmaceutical companies manufacture generic versions of metoprolol. These include major generic drug producers, making the medication widely accessible through various pharmacies [4].
Can You Stop Taking Metoprolol Suddenly?
It is generally not recommended to stop taking metoprolol abruptly. Sudden discontinuation can lead to a rebound effect, potentially causing a sudden increase in heart rate, blood pressure, or worsening of angina. Healthcare providers typically advise a gradual tapering of the dose when discontinuing the medication [1].