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Atorvastatin: Effects, Dosage and Side Effects
Atorvastatin is a prescription medication used to lower elevated cholesterol levels and to reduce the risk of cardiovascular diseases such as heart attack and stroke.
Add as Preferred SourceThings worth knowing about "Atorvastatin"
Atorvastatin is a prescription medication used to lower elevated cholesterol levels and to reduce the risk of cardiovascular diseases such as heart attack and stroke.
What is Atorvastatin?
Atorvastatin belongs to the drug class known as statins and is one of the most widely prescribed medications worldwide. It is used to lower elevated blood lipid levels (hypercholesterolaemia and hypertriglyceridaemia) and to reduce the risk of serious cardiovascular events such as heart attack or stroke. Atorvastatin is available by prescription only and is taken in tablet form.
Indications
Atorvastatin is prescribed for the following conditions:
- Primary hypercholesterolaemia: Elevated LDL cholesterol levels (so-called bad cholesterol)
- Familial hypercholesterolaemia: Genetically inherited, severely elevated cholesterol levels
- Combined hyperlipidaemia: Simultaneously elevated cholesterol and triglyceride levels
- Primary prevention: Prevention of heart attack and stroke in patients with elevated cardiovascular risk
- Secondary prevention: Protection after a previous heart attack, stroke, or other cardiovascular event
Mechanism of Action
Atorvastatin selectively and competitively inhibits the enzyme HMG-CoA reductase (3-hydroxy-3-methylglutaryl coenzyme A reductase). This enzyme catalyses the rate-limiting step in the body's own cholesterol biosynthesis in the liver. By inhibiting this enzyme, the liver produces less cholesterol and compensates by increasing the number of LDL receptors on its cell surface. These receptors remove more LDL cholesterol from the bloodstream, thereby lowering LDL levels. In addition, atorvastatin lowers triglyceride levels and may modestly raise HDL cholesterol (the so-called good cholesterol).
Dosage
The usual starting dose of atorvastatin is 10 to 20 mg per day. Depending on therapeutic goals and individual tolerability, the dose may be increased to a maximum of 80 mg daily. Atorvastatin can be taken at any time of day, with or without food, but should be taken at the same time each day. The appropriate dose is determined individually by the treating physician.
Side Effects
Atorvastatin is generally well tolerated by most patients. Possible side effects include:
- Common: Muscle pain (myalgia), joint pain, nasopharyngitis, diarrhoea, nausea
- Uncommon: Elevated liver enzyme levels, sleep disturbances, headache, dizziness
- Rare: Myopathy (muscle disease) or, in severe cases, rhabdomyolysis (serious muscle breakdown that may affect the kidneys)
- Very rare: Liver dysfunction, peripheral neuropathy, interstitial lung disease
Patients who experience severe muscle pain, muscle weakness, or dark-coloured urine during treatment should seek medical attention immediately.
Drug Interactions
Atorvastatin is primarily metabolised by the liver enzyme CYP3A4. Substances that inhibit this enzyme can increase atorvastatin blood levels and raise the risk of side effects. Clinically relevant interactions include:
- Certain antibiotics (e.g., clarithromycin, erythromycin)
- Antifungal agents (e.g., itraconazole, ketoconazole)
- HIV protease inhibitors
- Grapefruit juice (in large amounts)
- Other lipid-lowering agents (e.g., fibrates, niacin) increase the risk of myopathy
Contraindications
Atorvastatin must not be used in patients with:
- Known hypersensitivity to the active substance
- Active liver disease or persistently elevated liver enzyme levels of unknown origin
- Pregnancy and breastfeeding (atorvastatin is teratogenic and contraindicated)
Usage Notes
Atorvastatin should always be used in combination with a cholesterol-lowering diet and a healthy lifestyle including regular physical activity and smoking cessation. Regular monitoring of blood lipid levels and liver function tests is recommended during therapy.
References
- European Medicines Agency (EMA): Atorvastatin - Summary of Product Characteristics. https://www.ema.europa.eu (accessed 2024)
- Grundy SM et al. - 2018 AHA/ACC Guideline on the Management of Blood Cholesterol. Journal of the American College of Cardiology, 2019; 73(24): e285-e350.
- Mihaylova B et al. - The effects of lowering LDL cholesterol with statin therapy in people at low risk of vascular disease. The Lancet, 2012; 380(9841): 581-590.
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