Not yet medically reviewed — information on this site is in preparation and has not been verified by a medical reviewer.
Harm reduction
Drug interactions
Combining drugs changes the risk. This tool gives pair-specific ratings where clinical literature supports them (for example cocaine + ketamine), and category-levelguidance otherwise — each drawn from primary clinical sources. Combinations we can’t rate from those sources stay marked Unknown — pending review, which is not a claim of safety.
Check two drugs
+
Pick two substances to see interaction guidance — pair-specific where the evidence exists, category-level otherwise.
By category
Tap a cell for detail. Empty/grey cells are Unknown — pending review, not a safety claim.
