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[HEALTH] · Germany · 10 sources

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Grapefruit consumption can interfere with medication efficacy

The Consumer Advice Center of Rhineland-Palatinate has issued a warning regarding the interaction between grapefruit and various medications. Grapefruit contains substances that inhibit the enzyme CYP3A4, which is essential for the breakdown and processing of many pharmaceutical active ingredients.

This inhibition can cause medications to become either too strong or too weak. Affected drug classes include cholesterol-lowering medications, blood pressure treatments, immunosuppressants for autoimmune diseases like rheumatoid arthritis or multiple sclerosis, and certain cancer drugs, such as imatinib.

Experts note that even a single glass of juice can trigger these effects. Furthermore, waiting several hours between consumption and medication intake does not prevent the interaction, as the influence on metabolism can persist for several days. Patients are advised to check medication leaflets or consult a pharmacist to ensure safety.

Entities

CYP3A4 · Imatinib · Krebsinformationsdienst · Verbraucherzentrale Rheinland-Pfalz

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