Drug interactions
Diltiazem + Lomitapide
Severity: Contraindicated
Diltiazem and Lomitapide: contraindicated interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Diltiazem is a moderate CYP3A4 inhibitor and can raise lomitapide exposure several-fold. Higher lomitapide levels increase the risk of hepatotoxicity and gastrointestinal adverse effects. Labeling for lomitapide prohibits use with moderate and strong CYP3A4 inhibitors.
What this interaction means in plain words
Diltiazem and Lomitapide are not normally used together. Taking them at the same time is expected to cause harm or make one of them unsafe, so a different medicine is usually chosen for one of the two.
Diltiazem belongs to Cardiovascular; Lomitapide belongs to Cardiovascular.
Why it happens
Diltiazem inhibits CYP3A4-mediated first-pass and hepatic metabolism of lomitapide, markedly increasing its plasma concentration.
What to do
Do not co-administer; choose a different antihypertensive or antianginal that does not inhibit CYP3A4. Monitor liver enzymes if lomitapide continues with an alternative.
What to ask your pharmacist
- Is there an alternative to one of these two medicines for me?
- If both are essential, who is monitoring me and how often?
- Which symptoms mean I should stop and seek help straight away?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Diltiazem and Lomitapide, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 14 days on the web. No card needed.
Other interactions of Diltiazem
- Diltiazem + Flibanserin Contraindicated
- Diltiazem + Ivabradine Contraindicated
- Diltiazem + Lonafarnib Contraindicated
- Acebutolol + Diltiazem Major
- Alfentanil + Diltiazem Major
- Amifostine + Diltiazem Major
Other interactions of Lomitapide
- Aprepitant + Lomitapide Contraindicated
- Clarithromycin + Lomitapide Contraindicated
- Crizotinib + Lomitapide Contraindicated
- Efavirenz + Lomitapide Contraindicated
- Ensitrelvir + Lomitapide Contraindicated
- Erythromycin + Lomitapide Contraindicated
Frequently asked questions
Can I take Diltiazem with Lomitapide?
MediHelp rates the interaction as contraindicated. Diltiazem and Lomitapide are not normally used together. Taking them at the same time is expected to cause harm or make one of them unsafe, so a different medicine is usually chosen for one of the two. Diltiazem is a moderate CYP3A4 inhibitor and can raise lomitapide exposure several-fold. Higher lomitapide levels increase the risk of hepatotoxicity and gastrointestinal adverse effects. Labeling for lomitapide prohibits use with moderate and strong CYP3A4 inhibitors.
How serious is the interaction between Diltiazem and Lomitapide?
MediHelp rates it contraindicated, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Do not co-administer; choose a different antihypertensive or antianginal that does not inhibit CYP3A4. Monitor liver enzymes if lomitapide continues with an alternative.
What other medicines interact with Diltiazem?
MediHelp also lists interactions of Diltiazem with, for example, Flibanserin, Ivabradine, Lonafarnib. The full list is on the Diltiazem page.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
