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Cod-THC (Codeine Δ9-tetrahydrocannabinol carbonate) is a synthetic codrug formed by linking tetrahydrocannabinol with codeine via a carbonate bridge. It is well absorbed orally and shows superior analgesic effects in animal studies compared to a simple mixture of the two drugs.[1][2][3]
THC can partially inhibit CYP2D6, which is the enzyme that transforms codeine into its active metabolite morphine.[4][5] It's not well understood how THC may impact codeines metabolism in humans.