Amlodipine for hypertension and angina treatment

Amlodipine besylate is a long-acting calcium channel blocker used primarily to lower blood pressure in adults with hypertension and to treat chronic stable or vasospastic angina. It can be used alone or combined with other antihypertensive or antianginal medications to reduce the risk of cardiovascular events and relieve angina symptoms.

Hypertension: Amlodipine besylate tablets are prescribed to lower high blood pressure in adults, helping to reduce the risk of strokes, heart attacks, and other cardiovascular events. It may be used alone or with other blood pressure medicines.

Chronic stable angina: Used to relieve chest pain caused by restricted blood flow to the heart.

Vasospastic angina (Prinzmetal's angina): Effective for treating angina caused by coronary artery spasms.

Coronary artery disease (CAD): In patients with angiographically confirmed CAD without heart failure or low ejection fraction (

Amlodipine besylate

Amlodipine blocks calcium channels in vascular smooth muscle and cardiac muscle cells, reducing calcium influx. This causes the blood vessels to relax and dilate, lowering peripheral vascular resistance and blood pressure. By reducing the workload on the heart and dilating coronary arteries, it helps relieve angina symptoms caused by decreased oxygen supply to the heart muscles.

In exertional angina, it decreases afterload and myocardial oxygen demand. In vasospastic angina, it prevents artery spasms to improve blood flow. Its gradual onset and long duration provide sustained blood pressure control and angina relief.

Adults: For hypertension, start with 5 mg orally once daily, with a maximum of 10 mg once daily. In elderly, small, or hepatic-impaired patients, an initial dose of 2.5 mg may be used. Dose adjustments should be made every 7 to 14 days based on blood pressure response.

For chronic stable or vasospastic angina, 5 to 10 mg once daily is recommended, with 10 mg generally needed for adequate effect.

For coronary artery disease patients, doses between 5 and 10 mg once daily are used.

Children 6-17 years: Effective doses range from 2.5 mg to 5 mg once daily. Higher doses have not been studied.

Amlodipine besylate tablets are contraindicated in patients with known hypersensitivity to amlodipine.

• Hypotension: Symptomatic low blood pressure can occur, especially in patients with severe aortic stenosis, though acute hypotension is unlikely due to the drug's gradual effect.
• Increased angina or myocardial infarction: Worsening chest pain or heart attack may develop after starting or increasing dose, particularly in severe obstructive coronary artery disease.
• Hepatic impairment: Amlodipine is metabolized by the liver; in severe hepatic failure, elimination is slowed. Dose titration should be cautious and slow.

Most adverse effects are mild to moderate. Common dose-related side effects include:

• Peripheral edema (swelling) — increases with dose; about 10.8% at 10 mg vs 0.6% placebo
• Dizziness and flushing
• Palpitations

Less common effects (occurring >1%) include fatigue, nausea, abdominal pain, and somnolence. Some side effects such as edema, flushing, palpitations, and somnolence occur more frequently in women.

Rarely, events like arrhythmias, syncope, hypersensitivity reactions, gingival hyperplasia, and liver enzyme elevations have been reported.

• CYP3A inhibitors: Co-administration increases amlodipine blood levels; monitor for hypotension and edema; dose reduction may be needed.
• CYP3A inducers: Blood pressure should be closely monitored as these may lower amlodipine levels.
• Sildenafil: Possible additive hypotension; monitor blood pressure.
• Simvastatin: Amlodipine increases simvastatin exposure; simvastatin dose should not exceed 20 mg daily when used together.
• Immunosuppressants: Amlodipine may increase cyclosporine or tacrolimus levels; frequent monitoring and dose adjustments are recommended.

Pregnancy: Limited data from post-marketing reports are insufficient to establish risk of major birth defects. Animal studies showed no developmental toxicity at high doses, but increased fetal loss and decreased litter size were noted in rats at very high doses. Pregnant women with hypertension need careful monitoring and management due to associated maternal and fetal risks.

Lactation: Amlodipine is present in human breast milk at low levels. No adverse effects on breastfed infants have been observed, but data are limited. Effects on milk production are unknown.

Overdose may cause marked peripheral vasodilation leading to severe hypotension and possibly reflex tachycardia. Management includes active cardiac and respiratory monitoring, frequent blood pressure checks, fluid administration, elevation of extremities, and vasopressor use if hypotension persists. Hemodialysis is unlikely to be effective due to high protein binding.