Tiapamil

A calcium channel blocker

Tiapamil
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Tiapamil is a calcium channel blocker that is used in the treatment of cardiovascular disease. It is chemically related to verapamil, another calcium channel blocker, but has distinct pharmacological properties.

Pharmacology

Tiapamil functions by inhibiting the influx of calcium ions through voltage-gated calcium channels in the cardiac muscle and vascular smooth muscle. This action results in the relaxation of the smooth muscle and a decrease in myocardial contractility, which can lead to a reduction in blood pressure and an improvement in angina symptoms.

Mechanism of Action

Tiapamil binds to the L-type calcium channels, which are responsible for the slow inward current of calcium ions during the plateau phase of the cardiac action potential. By blocking these channels, tiapamil reduces the force of contraction of the heart muscle and dilates the coronary arteries, improving blood flow to the heart muscle.

Clinical Use

Tiapamil is primarily used in the management of hypertension and angina pectoris. It may also be used in certain cases of arrhythmia, where it helps to restore normal heart rhythm by slowing down the conduction of electrical impulses through the atrioventricular node.

Side Effects

Common side effects of tiapamil include dizziness, headache, nausea, and constipation. As with other calcium channel blockers, it may cause hypotension and bradycardia. Patients are advised to monitor their blood pressure regularly while on this medication.

Chemical Properties

Tiapamil is a derivative of the isoquinoline class of compounds. Its chemical structure includes a 3,4-dimethoxyphenyl group and a dimethylamino propyl side chain, which contribute to its pharmacological activity.

Related pages

• Calcium channel blocker
• Verapamil
• Hypertension
• Angina pectoris