Cyclophosphamide (Cytoxan) and Ketamine Therapy | Tovani Health
Cytoxan (Cyclophosphamide) (also: Neosar) — Alkylating cytotoxic agent (lymphoma, leukemia, breast cancer, autoimmune)
Verdict at Tovani Health
Fully compatible with KAP; the hemorrhagic cystitis risk is intrinsic and managed with mesna/hydration.
Cyclophosphamide and ketamine have no clinically significant interaction. Used across many oncologic indications and as immunosuppression in severe autoimmune disease (lupus nephritis, vasculitis). The intrinsic considerations — hemorrhagic cystitis (prevented with hydration and mesna at high doses), myelosuppression, alopecia, infertility risk, secondary malignancy risk with long-term use — are alkylating-agent class issues independent of KAP.
If you take Cytoxan regularly and are considering at-home ketamine therapy, the combination is generally safe at therapeutic doses. This page covers the brief pharmacologic context and what we do at intake.
How Cytoxan interacts with ketamine
Prodrug activated by hepatic CYP2B6 (also CYP3A4 minor) to alkylating metabolites that cross-link DNA. Worth noting: ketamine is also metabolized by CYP2B6 (and CYP3A4) — theoretical competition, but no clinically reported interaction.
What we do at intake
Continue your regimen. Tell us infusion or daily dosing schedule.
Bottom line
Cyclophosphamide and ketamine have no clinically significant interaction. Used across many oncologic indications and as immunosuppression in severe autoimmune disease (lupus nephritis, vasculitis). The intrinsic considerations — hemorrhagic cystitis (prevented with hydration and mesna at high doses), myelosuppression, alopecia, infertility risk, secondary malignancy risk with long-term use — are alkylating-agent class issues independent of KAP.
Ready to find out if at-home ketamine fits your situation?
We’ll note that you’re on Cytoxan (Cyclophosphamide) 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.
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.