Verapamil is a calcium channel blocker that widens your blood vessels and relaxes your heart muscle. This improves blood flow to your heart and helps it pump. Verapamil hydrochloride is an almost white, crystalline powder, practically free of odor, with a bitter taste. It is soluble in water, chloroform, and methanol. Verapamil hydrochloride is not chemically related to other antiarrhythmic drugs. Verapamil comes as a tablet, an extended-release (long-acting) tablet, and an extended-release (long-acting) capsule to take by mouth. The regular tablet is usually taken three to four times a day. The extended-release tablets and capsules are usually taken once or twice a day. Take verapamil at around the same time (s) every day. Certain verapamil products should be taken in the morning and. Find patient medical information for Verapamil (Calan, Verelan, others) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Verapamil is used to treat hypertension (high blood pressure), angina (chest pain), and certain heart rhythm disorders. Includes verapamil side effects, interactions and indications. Verapamil, sold under various trade names, [1] is a calcium channel blocker medication used for the treatment of high blood pressure, angina (chest pain from not enough blood flow to the heart), and supraventricular tachycardia. [9] It may also be used for the prevention of migraines and cluster headaches. [10][11] It is given by mouth or by injection into a vein. [9] Common side effects. DESCRIPTION Verapamil hydrochloride is a calcium antagonist or slow-channel inhibitor. Verapamil Hydrochloride Injection, USP is a sterile, nonpyrogenic solution containing verapamil hydrochloride 2.5 mg/mL and sodium chloride 8.5 mg/mL in water for injection. The solution contains no bacteriostat or antimicrobial agent and is intended for single-dose intravenous administration. May contain. Verapamil reference guide for safe and effective use from the American Society of Health-System Pharmacists (AHFS DI). Verapamil is a non-dihydropyridine calcium channel blocker. It's used to treat high blood pressure, arrhythmias, and chest pain (or angina) in adults. Verapamil works by slowing your heart rate and relaxing your blood vessels. This medication is taken by mouth typically about 3 to 4 times per day. Side effects can include constipation, dizziness, and nausea. Verapamil is a calcium channel blocker. It works by affecting the movement of calcium into the cells of the heart and blood vessels. As a result, verapamil relaxes blood vessels and increases the supply of blood and oxygen to the heart while reducing its workload. This medicine is available only with your doctor's prescription.