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Onset of action is 1 to 2 hours after oral dosage, and 3 to 5 minutes after intravenous bolus dosage. [ 6 ] [ 7 ] Biphasic or triphasic following IV administration; terminal elimination half-life is 2–8 hours. [ 39 ]
Compared with certain other L-type calcium channel blockers (for example those of the phenylalkylamine class such as verapamil) that have significant action at the heart, the dihydropyridine calcium channel blockers lower blood pressure mainly by relaxing the smooth muscle of the blood vessel walls. [3]
Side effects of these drugs may include but are not limited to: Constipation; Peripheral edema, which can occur in as much as 70% of people receiving calcium channel blocker, is caused by calcium channel blockers' preferential arteriolar or precapillary dilation without commensurate dilation in the venous or postcapillary circulation.
Class IV agents affect calcium channels and the AV node. Class V agents work by other or unknown mechanisms. With regard to management of atrial fibrillation, classes I and III are used in rhythm control as medical cardioversion agents, while classes II and IV are used as rate-control agents.
Trandolapril/verapamil (Tarka) [2] is an oral antihypertensive medication that combines a slow release formulation of verapamil hydrochloride, a calcium channel blocker, and an immediate release formulation of trandolapril, an ACE inhibitor. The patent, held by Abbott Laboratories, expired on February 24, 2015.
For supraventricular tachycardias , diltiazem appears to be as effective as verapamil in treating re-entrant supraventricular tachycardia. [17] Atrial fibrillation [18] or atrial flutter is another indication. The initial bolus should be 0.25 mg/kg, intravenous (IV). Because of its vasodilatory effects, diltiazem is useful for treating ...
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The regular dosage is 60 mg tablets every four hours. If the patient is unable to take tablets orally, it was previously given via intravenous infusion at a rate of 1–2 mg/hour (lower dosage if the body weight is <70 kg or blood pressure is too low), [7] but since the withdrawal of the IV preparation, administration by nasogastric tube is an alternative.