Taking Ranolazine With Ketamine: What to Know
Ranexa (Ranolazine) — Anti-anginal (late sodium current inhibitor; major CYP3A4 substrate)
Verdict at Tovani Health
Compatible; CYP3A4 inhibitors raise ranolazine levels meaningfully, watch for drug-stacking.
Ranolazine and ketamine are compatible. The direct interaction with ketamine is minimal, but ranolazine is a major CYP3A4 substrate — strong CYP3A4 inhibitors (clarithromycin, ritonavir/Paxlovid, ketoconazole, itraconazole) are contraindicated with ranolazine independent of KAP. Patients on ranolazine who are prescribed any of those interactors need careful drug review.
If you take Ranexa 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 Ranexa interacts with ketamine
Ranolazine inhibits the late sodium current in cardiac myocytes, used for chronic angina refractory to other therapy. Major CYP3A4 substrate with narrow therapeutic window. No direct ketamine interaction.
What we do at intake
Disclose ranolazine use and all other medications. We flag CYP3A4 inhibitor co-prescriptions even though that's a cardiology concern more than a KAP one.
Bottom line
Ranolazine and ketamine are compatible. The direct interaction with ketamine is minimal, but ranolazine is a major CYP3A4 substrate — strong CYP3A4 inhibitors (clarithromycin, ritonavir/Paxlovid, ketoconazole, itraconazole) are contraindicated with ranolazine independent of KAP. Patients on ranolazine who are prescribed any of those interactors need careful drug review.
Ready to find out if at-home ketamine fits your situation?
We’ll note that you’re on Ranexa (Ranolazine) 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.
- Influence of quercetin on the pharmacokinetics of ranolazine in rats and in vitro models. Babu PR, Babu KN, Peter PL. Drug Development and Industrial Pharmacy. 2013. PMID: 22817837
- 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
Clinically reviewed
Reviewed by Benjamin Soffer, DO on May 19, 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.