Grapefruit Juice and Simvastatin: Drug Interaction Guide

Quick answer: This combination requires caution. Grapefruit Juice and Simvastatin can be used together with adjustments and monitoring.

Interaction severity: Moderate — caution required

How Grapefruit Juice interacts with Simvastatin

Grapefruit juice inhibits intestinal CYP3A4, increasing simvastatin bioavailability. Higher simvastatin exposure increases myopathy risk.

What you should do

Advise patients to avoid grapefruit products or switch to a statin less affected by CYP3A4 inhibition.

Key facts

Severity

Moderate — caution required

Mechanism

Grapefruit juice inhibits intestinal CYP3A4, increasing simvastatin bioavailability. Higher simvastatin exposure increas...

Action

Advise patients to avoid grapefruit products or switch to a statin less affected by CYP3A4 inhibition.

Important medical disclaimer: This page provides educational information about drug interactions for general reference. It is not a substitute for professional medical advice, diagnosis, or treatment. Always discuss your specific medications with a qualified healthcare provider before starting, stopping, or changing any treatment. About our editorial team.

Frequently asked questions

Can I take Grapefruit Juice and Simvastatin together?

With caution. Advise patients to avoid grapefruit products or switch to a statin less affected by CYP3A4 inhibition.

What is the severity of this interaction?

The interaction between Grapefruit Juice and Simvastatin is classified as Moderate — caution required. Grapefruit juice inhibits intestinal CYP3A4, increasing simvastatin bioavailability. Higher simvastatin exposure increases myopathy risk.

What should I do if I'm prescribed both?

Advise patients to avoid grapefruit products or switch to a statin less affected by CYP3A4 inhibition. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

Last reviewed: by iMedic Medical Editorial Team. Our editorial process.