Phenazopyridine can interfere with certain laboratory tests, including some diabetic urine testing products cupric sulfate-type. The resulting reduction in methemoglobinemia and cyanosis is an aid in diagnosing phenazopyridine overdose. Dosage is based on your medical condition and response to therapy. If got any of it wrong, feel free to correct! Goldfinch View Public Profile Find More Posts by Goldfinch 01-31-2009, 11:21 AM Briza ICN Member Join Date: Dec 2004 Posts: 4,406 use the 200 mg tabs generic Rx Pyridium as needed and sparingly. phenazopyridine prescrizione on-line If you notice other effects not listed above, contact your doctor or pharmacist. It is important for you to keep written list of all of the prescription and nonprescription over-the-counter medicines you are taking, as well as any products such as vitamins, minerals, or other dietary supplements. The medication can cause permanent staining of soft contact lenses.