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Candesartan: Effects, Dosage & Side Effects

Candesartan is a blood pressure-lowering medication belonging to the class of angiotensin II receptor blockers. It is used to treat hypertension and heart failure.

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Things worth knowing about "Candesartan"

Candesartan is a blood pressure-lowering medication belonging to the class of angiotensin II receptor blockers. It is used to treat hypertension and heart failure.

What is Candesartan?

Candesartan is an angiotensin II receptor blocker (ARB, also known as a sartan) and is one of the most commonly prescribed medications for the treatment of high blood pressure (hypertension) and heart failure. It works by selectively blocking the action of angiotensin II, a hormone that causes blood vessels to narrow and raises blood pressure. Candesartan is taken orally as a tablet and is available in several dosage strengths.

Mechanism of Action

Candesartan selectively blocks the AT1 receptors for angiotensin II. Angiotensin II plays a central role in the renin-angiotensin-aldosterone system (RAAS), which regulates blood pressure and fluid balance in the body. By blocking the AT1 receptors, Candesartan:

Causes blood vessels to widen (vasodilation)
Reduces resistance in the arteries
Inhibits aldosterone release, promoting sodium excretion
Lowers blood pressure in a well-tolerated manner

Unlike ACE inhibitors, candesartan does not directly inhibit the ACE enzyme but acts further downstream in the RAAS. This generally results in better tolerability, as the dry cough commonly associated with ACE inhibitors occurs much less frequently.

Indications

High Blood Pressure (Hypertension)

Candesartan is a first-line treatment for arterial hypertension. It can be used as monotherapy or in combination with other antihypertensive agents such as hydrochlorothiazide or calcium channel blockers.

Heart Failure

In patients with heart failure with reduced ejection fraction (HFrEF), candesartan can improve cardiac function, reduce hospitalizations, and lower mortality. It is particularly recommended for patients who cannot tolerate ACE inhibitors.

Diabetic Nephropathy

Candesartan may be used in patients with type 2 diabetes and kidney disease to protect kidney function and slow the progression of renal damage.

Dosage

The dosage of candesartan depends on the indication and individual tolerability:

Hypertension: Starting dose is usually 4–8 mg once daily; maintenance dose 8–32 mg per day
Heart failure: Starting dose 4 mg once daily, gradually increased to up to 32 mg per day under medical supervision
Candesartan can be taken with or without food
Dosage should always be determined individually by a physician

Side Effects

Candesartan is well tolerated by most patients. Possible side effects include:

Common: Dizziness, headache, fatigue, upper respiratory tract infections
Occasional: Low blood pressure (hypotension), elevated potassium levels (hyperkalemia), worsening kidney function
Rare: Angioedema (swelling of the face, lips, tongue, or throat – seek immediate medical attention), liver function abnormalities, neutropenia

Compared to ACE inhibitors, dry irritating cough occurs significantly less often with candesartan, which generally improves treatment adherence.

Contraindications and Interactions

Contraindications

Pregnancy (contraindicated from the 2nd trimester onward due to risk of fetal harm)
Severe liver or kidney impairment
Concomitant use of aliskiren in patients with diabetes or renal impairment
Hypersensitivity to the active substance

Important Drug Interactions

Potassium-sparing diuretics / potassium supplements: Increased risk of hyperkalemia
NSAIDs (e.g., ibuprofen, diclofenac): May reduce the antihypertensive effect and impair kidney function
Lithium: Candesartan may increase lithium blood levels
ACE inhibitors or direct renin inhibitors: Combination increases the risk of adverse effects and is generally not recommended

Patient Information

Candesartan is a prescription-only medication and must only be taken on medical advice. Key points for patients:

Take candesartan regularly, even if you feel well – high blood pressure often causes no noticeable symptoms
Do not stop taking the medication without consulting your physician
Inform your doctor about all other medications you are taking
If you experience swelling of the face or difficulty breathing, seek immediate medical attention
Regular monitoring of blood pressure and kidney function is recommended

References

European Society of Cardiology (ESC) - Guidelines for the management of arterial hypertension (2023). ESC Clinical Practice Guidelines.
McDonagh T.A. et al. - 2021 ESC Guidelines for the diagnosis and treatment of acute and chronic heart failure. European Heart Journal, 42(36), 3599–3726.
Brunton L.L., Hilal-Dandan R., Knollmann B.C. - Goodman & Gilman's The Pharmacological Basis of Therapeutics. 13th edition. McGraw-Hill Education, 2018.

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