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Calcium channel blockers are medications that limit how the body uses calcium, slowing down how cells use calcium and reducing the amount of calcium that enters muscle cells in the heart and blood vessel walls. They are often prescribed to treat high blood pressure and heart and blood vessel issues. While calcium is necessary for muscle contractions, an elevation in calcium within the muscle cell can cause contraction-induced injury. Calcium channel blockers have been shown to reduce or prevent the contraction-induced rise in intracellular calcium levels and subsequent injury following muscle damage. However, it is unclear whether they can cause muscle spasms.
| Characteristics | Values |
|---|---|
| What are calcium channel blockers? | Medicines that many people take to lower their blood pressure |
| How do they work? | They block some of the channels calcium uses to enter and exit cells in the heart and blood vessels, slowing down the cells' use of calcium. |
| Types | Dihydropyridines (target blood vessels) and non-dihydropyridines (target heart muscles and blood vessels) |
| Side effects | Increase in chronic acid reflux (GERD) symptoms, gum overgrowth, skin rash, swelling in the face or limbs, and more |
| Muscle spasms | Some sources mention muscle contractions or spasms in relation to calcium channel blockers, but it is not clear whether the blockers cause or prevent them. |
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What You'll Learn
Calcium channel blockers reduce calcium entry into muscle cells
Calcium channel blockers are medications that limit how the body uses calcium. Calcium is necessary for muscle contractions to occur throughout the body. This mineral enters muscle cells through ion channels, which are tiny pores on a cell's surface. By slowing down how cells use calcium, these medications can lower blood pressure and prevent heart rhythm problems.
Calcium channel blockers block some of the channels calcium uses to enter and exit the body's cells, reducing calcium entry into muscle cells. This slows down the cells' use of calcium because there are fewer ways to bring it inside the cell. Certain types of calcium channels only exist in certain parts of the body, such as the heart and blood vessels. This is why calcium channel blockers are often used to treat heart and blood vessel issues.
There are two main types of calcium channel blockers: dihydropyridines (DHP) and non-dihydropyridines (non-DHP). Dihydropyridines target blood vessels and cause them to relax and widen, thereby lowering blood pressure. Non-dihydropyridines, such as diltiazem and verapamil, target heart muscles and blood vessels. They can be used to treat heart rhythm problems.
Calcium channel blockers are common medications with a low risk of complications. They are often prescribed for high blood pressure and can be taken long-term. Doctors may prescribe extended-release calcium channel blockers to prevent blood vessels from widening too much, which can cause swelling in the feet and legs.
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Blockers can prevent contraction-induced muscle damage
Calcium channel blockers (CCB) are medications that slow down the movement of calcium into and out of cells, thereby lowering blood pressure and preventing heart rhythm problems. CCBs are of two main types: dihydropyridines (DHP) and non-dihydropyridines (non-DHP).
CCBs have been shown to reduce or prevent contraction-induced muscle damage by attenuating the rise in intracellular calcium levels. Following contraction-induced damage to skeletal muscle, there is a loss of calcium homeostasis, which can be mitigated by CCBs. This loss of calcium homeostasis may be caused by a combination of factors, including loss of sarcoplasmic reticulum (SR) membrane integrity, ruptures in the sarcolemmal membrane, opening of stretch-responsive channels, and alterations in triad and t-tubule orientation.
In one study, the CCB amlodipine was administered to subjects who performed 300 maximal eccentric contractions. Muscle biopsies were taken at 4 and 24 hours post-damage, and the results indicated that CCBs attenuated or delayed contraction-induced damage to sarcomeric proteins. Another study, using a mouse model, found that CCBs provided a significant protective effect at 24 hours and full restoration of muscle force 9 days after damage.
Additionally, CCBs have been shown to attenuate desmin disruption and Z-band streaming, further indicating their effectiveness in preventing contraction-induced muscle damage. However, it is important to note that CCBs may not be effective in all cases, as other means of calcium entry into the cell or proteolytic pathways may come into play.
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They are prescribed to treat heart and blood vessel issues
Calcium channel blockers are medications that slow down how the body's cells use calcium. They limit the amount of calcium that can enter muscle cells in the heart and blood vessel walls. This, in turn, lowers blood pressure and prevents heart rhythm problems.
There are two main types of calcium channel blockers: dihydropyridines (DHP) and non-dihydropyridines (non-DHP). Dihydropyridines target blood vessels and make them relax, thereby treating high blood pressure. Non-dihydropyridines, on the other hand, target both the heart muscles and blood vessels. They can treat heart rhythm issues. Non-dihydropyridines include diltiazem and verapamil.
Calcium channel blockers are often prescribed to treat heart and blood vessel issues. They are recommended by the American Heart Association as a first-line treatment for high blood pressure. By increasing the flow of blood and oxygen to the heart, they can reduce chest pain (angina) caused by coronary artery spasms. They can also treat coronary heart disease by widening blood vessels and improving blood flow. For arrhythmia, or an irregular heartbeat, calcium channel blockers can help control a rapid heart rate.
While calcium channel blockers are common medications with a low risk of complications, they can cause side effects. These may include an increase in chronic acid reflux (GERD) symptoms and gum overgrowth.
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Blockers can cause swelling in the feet and legs
Calcium channel blockers are medicines that are often prescribed for lowering blood pressure and preventing heart rhythm problems. They work by limiting the amount of calcium that enters and exits the cells in the heart and blood vessels. However, while these medications can be beneficial for managing blood pressure, they may also lead to certain side effects. One notable adverse effect is peripheral oedema, which includes swelling in the feet and legs, particularly the ankles.
Peripheral oedema is a recognised complication of calcium channel blocker therapy, and it can significantly impact an individual's quality of life. This condition arises due to changes in capillary pressure, causing leakage into the surrounding interstitial areas, resulting in fluid accumulation in the legs and feet. The risk factors for developing peripheral oedema while taking calcium channel blockers include being female, older age, having heart failure, maintaining an upright posture, and residing in a warm environment.
The severity of ankle oedema can vary, ranging from mild cases that may go unnoticed to more severe instances that impair daily functioning. Long-term use of calcium channel blockers has been associated with additional symptoms, such as a petechial rash, hyperpigmentation, and discolouration around the affected area. In some cases, peripheral oedema may also be accompanied by muscle spasms or cramps, further exacerbating the discomfort experienced by individuals.
The management of peripheral oedema caused by calcium channel blockers can be challenging. Non-pharmacological approaches, such as elevating the legs while lying down or wearing compression stockings, have been suggested but lack strong supporting evidence. More effective strategies include adjusting the dosage of the calcium channel blocker, switching between dihydropyridine and non-dihydropyridine blockers, or combining them with other medications like angiotensin-converting enzyme inhibitors or angiotensin receptor blockers.
It is important for individuals taking calcium channel blockers to be aware of the potential side effect of peripheral oedema and to consult their healthcare provider if they experience any swelling in the feet and legs or other related symptoms. Early recognition and appropriate management of this adverse effect can help alleviate discomfort and improve the overall effectiveness of the medication regimen.
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They are not approved to treat migraines
Calcium channel blockers are medications that limit how the body uses calcium. They slow down how the body's cells use calcium, reducing the amount that can enter muscle cells in the heart and blood vessel walls. This, in turn, lowers blood pressure and prevents heart rhythm problems. They are often prescribed for high blood pressure and heart and blood vessel issues.
While calcium channel blockers can be used to treat chest pain (angina), irregular heartbeat (arrhythmia), and coronary heart disease, they are not approved to treat migraines. Although the exact cause of migraine attacks remains unclear, some doctors may prescribe verapamil as a preventative medication for migraines. Verapamil is a type of calcium channel blocker that specifically targets heart muscle cells.
It is important to note that the decision to prescribe any medication, including calcium channel blockers, is made by a licensed healthcare professional based on an individual's specific needs and medical history. While calcium channel blockers are generally considered safe, they may cause side effects in some people. These side effects can include an increase in gum growth around the teeth, symptoms of chronic acid reflux (GERD), and swelling in the feet and legs due to widened blood vessels.
If you are experiencing migraines, it is recommended that you consult a healthcare professional for advice and treatment options. They will be able to assess your individual needs and determine the most appropriate treatment plan for you, which may or may not include the use of calcium channel blockers.
While calcium channel blockers are not currently approved to treat migraines, scientists are actively exploring potential new uses for these medications. For example, it is believed that by reducing high blood pressure, calcium channel blockers may also lower the risk of Alzheimer's disease.
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Frequently asked questions
Calcium channel blockers are medications that limit how your body uses calcium by reducing the amount of calcium that can enter muscle cells in the heart and blood vessel walls. They are often prescribed to treat high blood pressure and heart and blood vessel issues.
Calcium channel blockers have been shown to reduce or prevent contraction-induced muscle damage and injury in rodents and humans. They are also being studied for their potential to reduce spasms that develop following SCI (spinal cord injury). Therefore, it is unlikely that they cause muscle spasms.
Some common side effects of calcium channel blockers include gum overgrowth, increased symptoms of chronic acid reflux (GERD), swelling in the feet and legs, and skin rash. They may also cause more severe symptoms like a change in heart rhythm or an allergic reaction.
If you experience any side effects from taking calcium channel blockers, you should consult your doctor. They may change your prescription or reduce your dosage to minimize the side effects.
