Ketoconazole (Nizoral) and Ketamine Therapy | Tovani Health
Nizoral (Ketoconazole) — Azole antifungal (extreme CYP3A4 inhibitor; topical now standard)
Verdict at Tovani Health
Topical Nizoral is fine; oral ketoconazole is a different drug entirely.
Ketoconazole requires individual evaluation based on formulation. The over-the-counter Nizoral shampoo and topical cream have negligible systemic absorption and no meaningful interaction with ketamine — those are fully compatible. Oral ketoconazole is a different conversation: it is the classical strongest CYP3A4 inhibitor in clinical pharmacology (used as the probe drug in PK studies), and its oral use was FDA-restricted in 2013 due to hepatotoxicity. Patients on oral ketoconazole for refractory fungal infection or Cushing's syndrome are uncommon but the CYP3A4 effect is substantial.
If you take Nizoral regularly and are considering at-home ketamine therapy, the combination is depends on your specific situation. This page covers the brief pharmacologic context and what we do at intake.
How Nizoral interacts with ketamine
Ketoconazole inhibits fungal lanosterol 14-alpha-demethylase. It is the prototypical CYP3A4 inhibitor in human pharmacology, raising plasma levels of CYP3A4-metabolized drugs (including ketamine) significantly. Topical use bypasses this because systemic absorption is negligible.
What we do at intake
Topical Nizoral shampoo or cream: continue as normal, no concern. Oral ketoconazole (rare today): disclose dose and indication; we evaluate individually and likely defer KAP until therapy ends plus a 2-week washout.
Bottom line
Ketoconazole requires individual evaluation based on formulation. The over-the-counter Nizoral shampoo and topical cream have negligible systemic absorption and no meaningful interaction with ketamine — those are fully compatible. Oral ketoconazole is a different conversation: it is the classical strongest CYP3A4 inhibitor in clinical pharmacology (used as the probe drug in PK studies), and its oral use was FDA-restricted in 2013 due to hepatotoxicity. Patients on oral ketoconazole for refractory fungal infection or Cushing's syndrome are uncommon but the CYP3A4 effect is substantial.
Ready to find out if at-home ketamine fits your situation?
We’ll note that you’re on Nizoral (Ketoconazole) 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 Anesthetic 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.