Posaconazole (Noxafil) and Ketamine Therapy | Tovani Health
Noxafil (Posaconazole) — Broad-spectrum triazole antifungal (invasive aspergillosis, candida prophylaxis)
Verdict at Tovani Health
Real KAP concern — posaconazole is a potent CYP3A4 inhibitor, similar magnitude to voriconazole and ritonavir.
Posaconazole and ketamine are compatible with planning. Posaconazole is one of the most potent CYP3A4 inhibitors in clinical use — used for invasive fungal infection treatment and as antifungal prophylaxis in high-risk patients (hematologic malignancy, post-transplant). Magnitude of CYP3A4 inhibition is comparable to voriconazole and the ritonavir component of Paxlovid. Chronic dosing (rather than the single 150mg fluconazole pill for yeast) means the interaction is durable. We dose-adjust KAP downward; with high-dose chronic posaconazole, we coordinate carefully.
If you take Noxafil 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 Noxafil interacts with ketamine
Posaconazole inhibits fungal CYP51 for its therapeutic effect, and is a strong inhibitor of human CYP3A4. Lipophilic with variable oral bioavailability — IV and delayed-release tablet formulations have more predictable PK than oral suspension. Therapeutic drug monitoring is standard.
What we do at intake
Disclose dose, indication, duration, and recent trough level if available. We adjust KAP dose for the CYP3A4 inhibition magnitude.
Bottom line
Posaconazole and ketamine are compatible with planning. Posaconazole is one of the most potent CYP3A4 inhibitors in clinical use — used for invasive fungal infection treatment and as antifungal prophylaxis in high-risk patients (hematologic malignancy, post-transplant). Magnitude of CYP3A4 inhibition is comparable to voriconazole and the ritonavir component of Paxlovid. Chronic dosing (rather than the single 150mg fluconazole pill for yeast) means the interaction is durable. We dose-adjust KAP downward; with high-dose chronic posaconazole, we coordinate carefully.
Ready to find out if at-home ketamine fits your situation?
We’ll note that you’re on Noxafil (Posaconazole) 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 23, 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.