Candesartan: ARB Blood Pressure Medication

What is Candesartan?

Candesartan is an oral medication belonging to a class of drugs called angiotensin receptor blockers (ARBs). It is primarily prescribed to treat high blood pressure (hypertension) and heart failure. This medication works by blocking certain receptors in the body that control blood vessel constriction, helping to lower blood pressure and reduce strain on the heart.

Uses

Candesartan is approved for several cardiovascular conditions:

• Hypertension: The primary use is treating high blood pressure in adults and children over 6 years old, helping to reduce the risk of stroke, heart attack, and kidney problems
• Heart failure: Used to treat heart failure in adults when the heart cannot pump blood effectively, often in combination with other heart medications
• Diabetic nephropathy: May be prescribed to protect kidney function in people with diabetes and high blood pressure
• Cardiovascular risk reduction: Sometimes used to lower the risk of heart attack and stroke in patients with multiple cardiovascular risk factors
• Post-heart attack treatment: May be used as part of treatment following a heart attack to improve heart function and survival

How it works

Candesartan blocks angiotensin II receptors in blood vessels, preventing a hormone called angiotensin II from binding to these receptors. When angiotensin II is blocked, blood vessels relax and widen, which lowers blood pressure and reduces the workload on the heart. This mechanism also helps improve blood flow and can protect organs like the kidneys from damage caused by high blood pressure.

Side effects

Common side effects:

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• Dizziness or lightheadedness
• Fatigue or weakness
• Upper respiratory tract infections
• Back pain
• Headache
• Nausea
• Diarrhea
• Elevated potassium levels

Serious side effects requiring immediate medical attention:

• Severe drop in blood pressure causing fainting
• Signs of kidney problems (decreased urination, swelling)
• Hyperkalemia (dangerous potassium levels causing irregular heartbeat)
• Allergic reactions including swelling of face, lips, tongue, or throat
• Chest pain or irregular heartbeat

Warnings and precautions

• Pregnancy: Candesartan should not be used during pregnancy, especially in the second and third trimesters, as it can cause serious harm or death to the developing fetus
• Kidney disease: Patients with severe kidney disease or those on dialysis should use this medication with extreme caution and require frequent monitoring
• Liver impairment: People with severe liver disease may need dose adjustments or alternative treatments
• Dehydration: Patients who are dehydrated, have low sodium levels, or are taking diuretics may experience dangerous drops in blood pressure
• Elderly patients: Older adults may be more sensitive to blood pressure-lowering effects and require careful monitoring

Interactions

• Potassium supplements and salt substitutes: Can cause dangerous elevation of potassium levels when combined with candesartan
• ACE inhibitors: Combining with other blood pressure medications may cause excessive blood pressure reduction and kidney problems
• NSAIDs (ibuprofen, naproxen): May reduce the blood pressure-lowering effect and increase risk of kidney damage
• Lithium: Candesartan may increase lithium levels in the blood, potentially causing toxicity
• Diuretics: May enhance blood pressure-lowering effects, requiring dose adjustments
• Diabetes medications: May increase the blood sugar-lowering effects of diabetes drugs
• Warfarin: May affect blood clotting times and require monitoring of INR levels
• Alcohol: Can enhance blood pressure-lowering effects and increase risk of dizziness

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Dosage

For hypertension in adults, the typical starting dose is 16 mg once daily, which may be increased to 32 mg once daily if needed. For heart failure, treatment usually begins with 4 mg once daily and is gradually increased to a target dose of 32 mg once daily as tolerated. Pediatric dosing for children over 6 years is weight-based and ranges from 4-16 mg once daily. Patients with kidney or liver problems may require lower starting doses. Your healthcare provider will determine the appropriate dose based on your specific condition, response to treatment, and other medications you may be taking.

Sources: FDA DailyMed drug labels (public domain), BNF, WHO Essential Medicines List. This article is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider before starting or stopping any medication.

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