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Norverapamil is a calcium channel blocker， it is the main active metabolite of verapamil.In vitro: Norverapamil is similarly effective as verapamil at inhibiting isoniazid and rifampicin tolerance and killing of intracellular M. tuberculosis in the absence of other drugs. norverapamil, also inhibits macrophage-induced tolerance and achieves similar serum levels to verapamil.[1] Norverapamil (NOR) is the major metabolite and shows approximately 20% of the efficacy of VER with regard to the vasodilation effect, but shows no antiarrhythmic activity. [2] Verapamil and its major metabolite norverapamil were identified to be both mechanism-based inhibitors and substrates of CYP3A and reported to have non-linear pharmacokinetics in clinic. [3]

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