Evolocumab – Mechanism, Dosage & Side Effects
Evolocumab is a medication used to lower elevated LDL cholesterol levels in the blood. It is prescribed when diet and statins alone are not sufficient to reach cholesterol targets.
Things worth knowing about "Evolocumab"
Evolocumab is a medication used to lower elevated LDL cholesterol levels in the blood. It is prescribed when diet and statins alone are not sufficient to reach cholesterol targets.
What is Evolocumab?
Evolocumab is a PCSK9 inhibitor – a monoclonal antibody that selectively targets the body's cholesterol metabolism. It is used to significantly reduce LDL cholesterol (often referred to as “bad cholesterol”) in the blood. The drug is marketed under the brand name Repatha® and is manufactured by Amgen.
Indications
Evolocumab is indicated for adults with the following conditions:
- Primary hypercholesterolemia: elevated LDL cholesterol levels not adequately controlled by diet and other medications
- Familial hypercholesterolemia: a hereditary condition causing very high cholesterol levels from birth
- Established cardiovascular disease: patients who have experienced a heart attack or stroke, to reduce the risk of future cardiovascular events
Mechanism of Action
Evolocumab works by blocking the protein PCSK9 (proprotein convertase subtilisin/kexin type 9). Under normal circumstances, PCSK9 degrades LDL receptors on liver cells – receptors that are responsible for clearing LDL cholesterol from the bloodstream. By inhibiting PCSK9, evolocumab allows more LDL receptors to remain active on the surface of liver cells. This enables the liver to remove significantly more LDL cholesterol from the blood, leading to a substantial reduction in LDL levels.
Dosage and Administration
Evolocumab is administered as a subcutaneous injection (under the skin). Two common dosing regimens are available:
- 140 mg every two weeks
- 420 mg once monthly
The injection is delivered using a pre-filled autoinjector or pen device, and after proper training, patients may self-administer the injection. Recommended injection sites include the abdomen, thigh, or upper arm.
Side Effects
Evolocumab is generally well tolerated. Possible side effects include:
- Injection site reactions (redness, swelling, or pain)
- Nasopharyngitis (common cold symptoms)
- Back pain
- Flu-like symptoms
- Rarely: hypersensitivity reactions
Serious adverse events are uncommon. Patients should contact their doctor promptly if they experience unusual or severe reactions.
Treatment Context
Evolocumab is typically used as an add-on therapy to statins when statins alone do not achieve adequate LDL reduction, or as an alternative in patients who cannot tolerate statins. The treatment is prescribed by a physician and requires regular monitoring of blood lipid levels to assess therapeutic response and safety.
References
- European Medicines Agency (EMA): Repatha (Evolocumab) – Summary of Product Characteristics and European Public Assessment Report. Available at: https://www.ema.europa.eu
- Sabatine MS et al. – Evolocumab and Clinical Outcomes in Patients with Cardiovascular Disease. New England Journal of Medicine, 2017; 376:1713–1722.
- Catapano AL et al. – 2016 ESC/EAS Guidelines for the Management of Dyslipidaemias. European Heart Journal, 2016; 37(39):2999–3058.
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