Aprepitant (Emend) and Ketamine Therapy | Tovani Health
Emend (Aprepitant) (also: Cinvanti) — NK1 receptor antagonist (chemotherapy-induced nausea, post-op nausea)
Verdict at Tovani Health
Both moderate CYP3A4 inhibitor AND inducer in the same patient — direction depends on duration.
Aprepitant and ketamine are compatible with planning. The interesting pharmacology: aprepitant is a moderate CYP3A4 inhibitor early in a course (first 3 days) and a CYP3A4 inducer with longer dosing. For the typical short antiemetic course (3-day chemo cycle, single PO post-op dose), the net effect on a same-day KAP session is mild CYP3A4 inhibition — modestly raising ketamine levels. Chronic use shifts toward induction. Because the direction depends on dosing pattern and timing relative to the KAP session, we evaluate case-by-case and monitor. If you're a chemo patient managing nausea, we typically schedule KAP outside the active aprepitant window.
If you take Emend regularly and are considering at-home ketamine therapy, the combination is safe with monitoring or modest dose adjustment. This page covers the brief pharmacologic context and what we do at intake.
How Emend interacts with ketamine
Aprepitant blocks NK1 receptor binding of substance P in the brainstem vomiting center. CYP3A4 substrate; behaves as a moderate inhibitor short-term and an inducer with prolonged exposure.
What we do at intake
Disclose dose, schedule, and last dose taken. We'll plan session timing around your aprepitant cycle.
Bottom line
Aprepitant and ketamine are compatible with planning. The interesting pharmacology: aprepitant is a moderate CYP3A4 inhibitor early in a course (first 3 days) and a CYP3A4 inducer with longer dosing. For the typical short antiemetic course (3-day chemo cycle, single PO post-op dose), the net effect on a same-day KAP session is mild CYP3A4 inhibition — modestly raising ketamine levels. Chronic use shifts toward induction. Because the direction depends on dosing pattern and timing relative to the KAP session, we evaluate case-by-case and monitor. If you're a chemo patient managing nausea, we typically schedule KAP outside the active aprepitant window.
Ready to find out if at-home ketamine fits your situation?
We’ll note that you’re on Emend (Aprepitant) at intake. The eligibility check takes 5 minutes and gives you an honest answer about whether at-home ketamine fits your specific situation.
FL and NJ residents only. Benjamin Soffer, DO — Tovani Health.
Sources
The verdict and clinical guidance on this page are based on the following peer-reviewed literature and FDA prescribing information.
- Ketamine: A Review of Clinical Pharmacokinetics and Pharmacodynamics in Anesthesia and Pain Therapy. Peltoniemi MA, Hagelberg NM, Olkkola KT, Saari TI. Clinical Pharmacokinetics. 2016. PMID: 27028535
- Pharmacodynamic Interactions Between Ketamine and Psychiatric Medications Used in the Treatment of Depression: A Systematic Review. Veraart JKE, Smith-Apeldoorn SY, Bakker IM. International Journal of Neuropsychopharmacology. 2021. PMID: 34170315
Clinically reviewed
Reviewed by Benjamin Soffer, DO on May 22, 2026. Dr. Soffer is a board-certified physician (American Board of Internal Medicine) licensed in Florida and New Jersey, prescribing at-home ketamine therapy through Tovani Health.
This page is general information about how this medication interacts with at-home ketamine therapy at Tovani Health. It is not a substitute for medical advice from your prescribing physician about your specific situation. Always discuss medication changes with the doctor who prescribed them.