A large number of medications and chemicals inhibit organic anion transporters, which normally transport porphyrins, especially coproporphyrins, into the bile; common examples include artesunate, balsalazide, benazepril, chlorpropamide, cortisol, demeclocycline, diflunisal, flavonoids, irbesartan, mefenamic acid, nitazoxanide, penciclovir, probenecid, rifampicin, rosuvastatin, stiripentol, telmisartan, and valsartan, among others (1, 2).