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Atorvastatin: Uses, Dosage & Side Effects

Atorvastatin is a prescription medication used to lower elevated cholesterol levels and reduce the risk of cardiovascular disease. It belongs to the statin drug class.

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Things worth knowing about "Atorvastatin"

Atorvastatin is a prescription medication used to lower elevated cholesterol levels and reduce the risk of cardiovascular disease. It belongs to the statin drug class.

What is Atorvastatin?

Atorvastatin is a cholesterol-lowering medication belonging to the class of drugs known as statins (HMG-CoA reductase inhibitors). It is available by prescription and is used to treat elevated blood lipid levels and to reduce the risk of heart attack, stroke, and other cardiovascular events. Atorvastatin is one of the most widely prescribed medications in the world.

Indications

Atorvastatin is indicated for:

Hypercholesterolaemia: elevated LDL cholesterol levels in the blood
Mixed dyslipidaemia: simultaneously elevated cholesterol and triglyceride levels
Primary prevention: reducing the risk of heart attack and stroke in high-risk patients
Secondary prevention: following a heart attack, stroke, or in patients with coronary artery disease
Familial hypercholesterolaemia: genetically caused severely elevated cholesterol levels

Mechanism of Action

Atorvastatin inhibits the enzyme HMG-CoA reductase, which catalyses a key step in cholesterol biosynthesis in the liver. By blocking this enzyme, the liver produces less cholesterol. In response, the liver upregulates the number of LDL receptors on its surface, which then remove LDL cholesterol from the bloodstream. This leads to a significant reduction in circulating LDL cholesterol (often referred to as bad cholesterol).

Dosage

The usual starting dose is 10 to 20 mg once daily. Depending on the therapeutic goal and individual tolerability, the dose may be increased up to 80 mg per day. Atorvastatin can be taken with or without food and should ideally be taken at the same time each day. The appropriate dose is determined by a physician.

Side Effects

Common Side Effects

Muscle pain or weakness (myalgia)
Headache
Nausea and gastrointestinal discomfort
Elevated liver enzymes (transaminases)

Rare but Serious Side Effects

Rhabdomyolysis: severe muscle breakdown that can lead to kidney failure (very rare)
Myopathy: muscle disease characterised by severe pain and loss of strength
Increased risk of type 2 diabetes with long-term use
Liver dysfunction

Patients should seek immediate medical advice if they experience unusual muscle pain, dark-coloured urine, or severe weakness.

Drug Interactions

Atorvastatin is metabolised by the liver enzyme CYP3A4. The following substances may affect its efficacy or side effect profile:

Grapefruit juice: inhibits CYP3A4 and can raise atorvastatin plasma levels
Ciclosporin, clarithromycin, itraconazole: increase the risk of muscle damage
Fibrates (e.g. gemfibrozil): concurrent use increases the risk of myopathy
Anticoagulants (e.g. warfarin): the anticoagulant effect may be enhanced

Contraindications

Active liver disease or persistently elevated liver enzymes
Pregnancy and breastfeeding (teratogenic)
Known hypersensitivity to atorvastatin

Treatment Context

Atorvastatin is typically used as part of a comprehensive treatment plan that also includes lifestyle modifications. These include a low-cholesterol diet, regular physical activity, smoking cessation, and weight management. In most cases, treatment is long-term, as the cholesterol-lowering effect diminishes after the medication is discontinued.

References

European Society of Cardiology (ESC) / European Atherosclerosis Society (EAS) - Guidelines for the management of dyslipidaemias. European Heart Journal, 41(1), 111-188 (2019).
Grundy SM et al. - 2018 AHA/ACC Guideline on the Management of Blood Cholesterol. Journal of the American College of Cardiology, 73(24), e285-e350 (2019).
European Medicines Agency (EMA) - Summary of Product Characteristics for Atorvastatin. www.ema.europa.eu.

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