Black—cascara, co-trimoxazole, ferrous salts, levodopa, methocarbamol, methyldopa, naphthalene, quinine, sulfonamides

Dark—cascara, levodopa, metronidazole, primaquine, quinine, senna

Brown—cascara, chloroquine, levodopa, methocarbamol, methyldopa, metronidazole, nitrofurantoin, primaquine, quinine, rifampin, senna, sulfonamides

Blue—amitriptyline, cimetidine, indigo blue, methylene blue, mitoxantrone, nitrofurantoin, triamterene

Blue/green—amitriptyline, cimetidine, indigo blue, indomethacin, magnesium salicylate, methylene blue, propofol

Orange—chlorzoxazone, dihydroergotamine, heparin, phenazopyridine, riboflavin, rifampin, ­sulfasalazine, warfarin

Pink—anthraquinone dyes, aspirin, cascara, deferoxamine, methyldopa, phenytoin, salicylates, senna, phenothiazines

Purple—phenolphthalein

Red—cascara, chlorpromazine, daunorubicin, deferoxamine, dihydroergotamine, dimethyl sulfoxide, doxorubicin, heparin, ibuprofen, methyldopa, phenazopyridine, phenolphthalein, phenothiazines, phenytoin, rifampin, senna, warfarin

Red-purple—chlorzoxazone, ibuprofen, senna