An orange colored urine is usually due to the presence of a medication.


Reasons for an orange-colored urine that has an alkaline pH:

(1) phenazopyridine (red with acid urine)

(2) Congo red

(3) phenindione

(4) sulfasalazine


Reasons for an orange to red colored urine:

(1) bile

(2) rifampin

(3) warfarin sodium

(4) ethoxazene


Porphyria may also cause an orange-colored or orange-red urine.


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