Ketoconazole and Aprepitant Interaction
Drug interaction information between Ketoconazole and Aprepitant.
Ketoconazole and Aprepitant have a documented moderate interaction in FDA labeling.
FDA drug labeling documents a moderate-severity interaction between Ketoconazole and Aprepitant. This page displays the available source-record category and label text. The category is not an individual risk estimate or medication-combination direction.
How They Interact
Ketoconazole strongly blocks the enzymes that clear aprepitant from your body, causing drug levels to rise.
FDA Label Information
Intervention Avoid concomitant use of aprepitant Examples Moderate inhibitor: diltiazem Strong inhibitors: ketoconazole, itraconazole, nefazodone, troleandomycin, clarithromycin, ritonavir, nelfinavir Strong CYP3A4 Inducers Clinical Impact Substantially decreased exposure of aprepitant in patients chronically taking a strong CYP3A4 inducer may decrease the efficacy of aprepitant [see Clinical Pharmacology ( 12.3 )] . Intervention Avoid concomitant use of aprepitant Examples Moderate inhibitor: diltiazem Strong inhibitors: ketoconazole, itraconazole, nefazodone, troleandomycin,...
Ketoconazole Also Interacts With
- Alfuzosin major
- Dronedarone major
- Ranolazine major
- Saxagliptin major
- Sildenafil major
Aprepitant Also Interacts With
- Pimozide major
- Alprazolam moderate
- Diltiazem moderate
- Methylprednisolone moderate
- Clarithromycin moderate
Frequently Asked Questions
What SPL severity band is on file for Ketoconazole + Aprepitant?
Compiled FDA labeling labels this pair moderate. That is a source-record field, not an individual medication-combination decision.
Which drug in this pair has the larger labeled-interaction portfolio?
Ketoconazole has 113 labeled pairs on file vs Aprepitant's 22. In the moderate band specifically: Ketoconazole has 22 (also Alprazolam, Budesonide/Formoterol, Dexamethasone, Fesoterodine); Aprepitant has 9 (also Alprazolam, Diltiazem, Methylprednisolone, Clarithromycin).
What mechanism field is on file for Ketoconazole and Aprepitant?
Ketoconazole strongly blocks the enzymes that clear aprepitant from your body, causing drug levels to rise.
Ketoconazole carries more major-labeled pairs than Aprepitant
SPL source-record counts only. This page's band is moderate · classes on file: Ketoconazole (Azole Antifungal); Aprepitant (NK1 Receptor Antagonist (Antiemetic)).
Ketoconazole has 6 major-labeled pairs vs Aprepitant's 1. This page itself is in the moderate band, not the major band.
6 major · 22 moderate · 85 minor · 113 total
- Other moderate peers for Ketoconazole
- Alprazolam
- Budesonide/Formoterol
- Dexamethasone
- Fesoterodine
1 major · 9 moderate · 12 minor · 22 total
- Other moderate peers for Aprepitant
- Alprazolam
- Diltiazem
- Methylprednisolone
- Clarithromycin
Sources: FDA Drug Labels (SPL) via openFDA (2026). This is for informational purposes only and is not medical advice. This registry does not provide individual medication-combination directions.
Read our methodology - how this data is sourced, computed, and verified.