Introduction
Candesartan cilexetil is an angiotensin II receptor blocker (ARB) used to treat high blood pressure (hypertension) and heart failure. It is a prodrug that is converted to its active form, candesartan, after oral administration. Candesartan helps to lower blood pressure and reduce the strain on the heart.
Uses
Candesartan cilexetil is prescribed for:
- Management of hypertension to reduce the risk of stroke, heart attack, and kidney problems.
- Treatment of heart failure to improve symptoms and decrease the risk of hospitalization.
- Reduction of cardiovascular mortality in certain patients with heart failure.
| Brand Name | Giran |
|---|---|
| Type | Tablet |
| Weight | 16 mg |
| Generic | Candesartan Cilexetil |
| Manufacturer | Aristopharma Ltd. |
| Available in | English বাংলা |
Mechanism of Action
Candesartan cilexetil works by selectively blocking the angiotensin II type 1 (AT1) receptors. Angiotensin II is a hormone that causes blood vessels to constrict, increasing blood pressure. By blocking this receptor, candesartan causes blood vessels to relax and dilate, resulting in lowered blood pressure and reduced workload on the heart.
How Long Does It Take to Work?
The antihypertensive effects of candesartan cilexetil typically begin within 2 weeks of starting treatment, with peak effects observed at around 4-6 weeks. For heart failure, the full benefits may take several weeks to months of continuous therapy.
Absorption
Candesartan cilexetil is rapidly absorbed from the gastrointestinal tract after oral administration. The prodrug is converted to its active form, candesartan, which has good oral bioavailability. Peak plasma concentrations of candesartan occur approximately 3-4 hours after dosing.
Route of Elimination
Candesartan is primarily eliminated via the urine, with about 50% of the dose excreted as unchanged drug. The remainder is excreted in the feces. It is minimally metabolized in the liver.
Dosage
Hypertention: initially 8 mg (hepatic impairment 2 mg, renal impairment or intravascular volume depletion 4 mg) once daily, increased if necessary at intervals of 4 weeks to max 32 mg once daily; usual maintenance dose 8 mg once daily.Heart failure: initially 4 mg once daily, increased at intervals of at least 2 weeks to target dose of 32 mg once daily or to max tolerated dose.
Typical dosages for hypertension are:
- Initial dose: 8 mg once daily
- Maintenance dose: 8 mg to 32 mg once daily, depending on blood pressure response and tolerability
- Initial dose: 4 mg to 8 mg once daily
- Maintenance dose: 8 mg to 32 mg once daily
Administration
Candesartan cilexetil is administered orally in tablet form. It can be taken with or without food. Consistent daily dosing at the same time each day is recommended to maintain stable blood levels.
Side Effects
Common side effects include:
- Dizziness
- Headache
- Fatigue
- Back pain
- Hyperkalemia (elevated potassium levels)
- Renal impairment
- Angioedema (swelling of deeper layers of skin)
Toxicity
Toxicity symptoms may include severe hypotension, renal impairment, or hyperkalemia. Treatment focuses on supportive care, discontinuation of the drug, and management of symptoms. In cases of overdose, seek immediate medical attention.
Precautions
Precautions include:
- Monitoring kidney function and potassium levels periodically.
- Avoiding use in combination with other drugs that can increase potassium levels.
- Use with caution in patients with a history of renal artery stenosis or severe renal impairment.
Interaction
Drug interactions may occur with:
- Other antihypertensives, which can enhance the blood pressure-lowering effect.
- Potassium-sparing diuretics or potassium supplements, which can increase the risk of hyperkalemia.
- Nonsteroidal anti-inflammatory drugs (NSAIDs), which may reduce the effectiveness of candesartan and impair renal function.
Disease Interaction
Use with caution in patients with:
- Severe renal impairment
- Hepatic impairment
- Congestive heart failure
Drug Interaction
Potential drug interactions include:
- Angiotensin-converting enzyme (ACE) inhibitors, which may increase the risk of hyperkalemia.
- Diuretics, particularly those that can affect potassium levels.
- Lithium, as concurrent use may increase lithium levels and toxicity.
Food Interactions
Food does not significantly affect the absorption of candesartan cilexetil. It can be taken with or without food.
Pregnancy Use
Candesartan cilexetil is contraindicated during pregnancy, particularly in the second and third trimesters, due to potential harm to the fetus. It should be discontinued as soon as pregnancy is detected.
Lactation Use
The safety of candesartan cilexetil during lactation is not well established. It is recommended to either avoid breastfeeding or discontinue the medication, depending on the importance of the drug to the mother.
Acute Overdose
Acute overdose can lead to severe hypotension, electrolyte imbalances, and renal impairment. Immediate medical attention is necessary, with treatment focusing on supportive care and symptomatic management.
Contraindication
Contraindications include:
- Hypersensitivity to candesartan or any component of the formulation
- Pregnancy
- Severe renal impairment or dialysis
Use Direction
Follow the prescribed dosage and administration instructions provided by a healthcare provider. Regular monitoring of blood pressure, kidney function, and potassium levels is essential. Adjustments to the dose should be made based on medical advice and patient response.
Storage Conditions
Store tablets at room temperature, between 15°C and 30°C (59°F and 86°F). Keep in a dry place away from light and moisture. Ensure the medication is kept out of reach of children and used within its expiration date.
Volume of Distribution
The volume of distribution for candesartan is approximately 0.1 L/kg, indicating that the drug is widely distributed throughout the body.
Half Life
The terminal half-life of candesartan is approximately 9 hours, which allows for once-daily dosing in most patients.
Clearance
The clearance of candesartan is primarily renal, with about 50% of the dose excreted as unchanged drug in the urine. The remainder is cleared via fecal elimination.
See in details version Giran Tablet 16 mg also Giran Tablet 16 mg in bangla
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