Interaction between Alosetron and Teriflunomide
Moderate Metabolism

ID DDInter52 and DDInter1771
Interaction Coadministration with teriflunomide may decrease the plasma concentrations and therapeutic effects of drugs that are substrates of CYP450 1A2. The proposed mechanism is increased clearance due to teriflunomide-mediated induction of CYP450 1A2.
Management Caution is advised if teriflunomide is used concomitantly with drugs that are substrates of CYP450 1A2. Dosage adjustments as well as clinical and laboratory monitoring should be considered whenever teriflunomide is added to or withdrawn from therapy with these drugs.
References
Alternative for Alosetron A03A
Alternative for Teriflunomide L04A
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Potential Metabolism Interactions

Substrate-Substrate Interaction:If more than one drug is metabolized by the same CYP, it is possible that its metabolism is inhibited because of the competition between the drugs. That means, it can be useful to lower the dosage of the drugs in the drug-cocktail because they remain longer in the organism than in monotherapy.
Inhibitor-Inhibitor Interaction:Combining two or more inhibitors of one CYP, should be compensated by lowering the dosage of these drugs because the metabolism is reduced and the drugs remain longer in the organism than in monotherapy. Not adapting the dosage bears the risk of even more side effects.
Inhibitor-Substrate Interaction:Combining drugs that have inhibitory effect and are substrates of one particular CYP, should be compensated by lowering the dosage. They rest longer in the organism than in monotherapy. Not adapting the dosage bears the risk of even more side effects.