What other drugs will affect phenazopyridine? There may be other drugs that can interact with phenazopyridine. The information contained herein is not intended to cover all possible uses, kjope phenazopyridine lege resept directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. As cold as this morning started out, felt that substantial breakfast would be good idea. Previous next Report Problems to the Food and Drug Administration You are encouraged to report negative side effects of prescription drugs to the FDA.