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Fibrates: Mechanism, Uses & Side Effects

Fibrates are prescription medications used to lower elevated blood lipid levels. They primarily reduce triglycerides and can increase HDL cholesterol.

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Things worth knowing about "Fibrates"

Fibrates are prescription medications used to lower elevated blood lipid levels. They primarily reduce triglycerides and can increase HDL cholesterol.

What are Fibrates?

Fibrates are a class of lipid-lowering medications primarily used to treat hypertriglyceridemia (elevated triglyceride levels in the blood). The most commonly used active substances include fenofibrate, bezafibrate, and gemfibrozil. Fibrates are typically prescribed when diet and lifestyle changes alone are insufficient to bring blood lipid levels into a healthy range.

Indications

Fibrates are mainly indicated in the following conditions:

Hypertriglyceridemia: Significantly elevated triglyceride levels that can increase the risk of pancreatitis.
Mixed hyperlipidemia: Simultaneously elevated triglyceride and cholesterol levels.
Low HDL cholesterol: Fibrates can raise so-called "good" HDL cholesterol levels.
Primary prevention: In certain high-risk patients to help prevent cardiovascular events.

Mechanism of Action

Fibrates act as agonists (activators) of the peroxisome proliferator-activated receptor alpha (PPAR-α), a nuclear receptor found primarily in liver and muscle cells. Activation of PPAR-α triggers the following processes:

Increased activity of lipoprotein lipase, an enzyme that breaks down triglycerides in the blood.
Decreased production of apolipoprotein C-III, an inhibitor of lipoprotein lipase.
Increased synthesis of apolipoprotein A-I and A-II, the main components of HDL cholesterol.
Reduction of hepatic (liver-derived) triglyceride production.

The result is a significant reduction in triglycerides by up to 50% and a moderate increase in HDL cholesterol by up to 20%.

Dosage

Dosage depends on the specific active substance and the individual patient situation. Examples include:

Fenofibrate: 145 mg once daily (micronized form) or 160 mg once daily.
Bezafibrate: 200 mg two to three times daily, or 400 mg as a sustained-release tablet once daily.
Gemfibrozil: 600 mg twice daily, taken 30 minutes before meals.

Intake should always follow medical instructions. Regular monitoring of blood lipid and liver enzyme levels is recommended.

Side Effects

Fibrates are generally well tolerated but may cause the following side effects:

Gastrointestinal complaints: Nausea, abdominal pain, diarrhea, or constipation.
Muscle complaints (myopathy): Muscle pain or muscle breakdown, particularly when taken in combination with statins (increased risk of rhabdomyolysis).
Elevated liver enzymes: Temporary increases in liver enzymes (ALT, AST).
Gallstones: Increased risk due to changes in bile composition.
Drug interactions: Gemfibrozil can potentiate the effects of anticoagulants such as warfarin.

Drug Interactions

The following interactions should be considered when taking fibrates alongside other medications:

Statins: Combination therapy significantly increases the risk of myopathy and rhabdomyolysis. Gemfibrozil should not be combined with statins; fenofibrate is considered the safer alternative in combination therapy.
Anticoagulants (e.g., warfarin, phenprocoumon): Fibrates can enhance the anticoagulant effect. Close INR monitoring is required.
Immunosuppressants (e.g., cyclosporine): Increased risk of kidney damage.

Contraindications

Fibrates must not be taken in cases of:

Severe renal or hepatic impairment
Gallbladder disease (e.g., gallstones)
Pregnancy and breastfeeding
Hypersensitivity to the active substance

References

European Society of Cardiology (ESC) / European Atherosclerosis Society (EAS): ESC/EAS Guidelines for the management of dyslipidaemias (2019). European Heart Journal.
Staels B. et al. - Mechanism of Action of Fibrates on Lipid and Lipoprotein Metabolism. Circulation (1998); 98:2088-2093.
European Medicines Agency (EMA): Product information for fenofibrate and bezafibrate. www.ema.europa.eu.

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