Verapamil HCl is a synthetic calcium channel blocker used therapeutically as an antiarrhythmic and antihypertensive agent. It works by inhibiting the influx of calcium ions into cardiac and smooth muscle cells through the l-type voltage-gated calcium channels. This blockade reduces intracellular calcium concentration which leads to relaxation of vascular smooth muscle and decreased myocardial contractility. The resulting vasodilation lowers peripheral resistance and contributes to the reduction of arterial blood pressure. In ischemic myocardium the drug improves oxygen supply by decreasing the heart's workload and by shortening the refractory period of atrial tissue. These combined pharmacologic actions help control abnormal heart rhythms and manage high blood pressure without relying on direct sympatholytic activity.

Verapamil HCl is a calcium channel blocker used to treat high blood pressure and certain heart rhythm disorders. It works by reducing the influx of calcium into vascular and cardiac muscle cells. This inhibition relaxes blood vessels, which lowers peripheral vascular resistance and decreases arterial pressure. In the heart it slows the rate of electrical conduction through the atrioventricular node and reduces the force of myocardial contraction. The combined effect of vessel relaxation and reduced cardiac workload improves oxygen delivery and alleviates symptoms of angina. These actions are achieved through selective antagonism of l type calcium channels at the cellular level.

Constipation is a frequent side effect of Verapamil HCl. Dizziness may appear especially when getting up quickly. Headaches are commonly reported by users of the drug. Fatigue can develop during treatment. Low blood pressure may be observed in some individuals. Swelling of the ankles is another possible effect.

Verapamil HCl may cause constipation as a common side effect. It can lead to dizziness or lightheadedness in some patients. Fatigue and weakness are frequently reported. Headaches are also observed among users. Nausea or mild stomach discomfort may occur. Swelling of the ankles or feet can happen occasionally. In rare cases, a slow heart rate may be noted.