Cystex Urinary Pain Relief Tablets combine a key pain-fighting analgesic, sodium salicylate, with an effective antibacterial agent, methenamine, to help stop the pain and help keep the infection in check until you can see your doctor. Additionally, Cystex Urinary Pain Relief Tablets will not change the color of the urine as some other OTC medications will. It’s important to be sure to visit a doctor if you think you have a UTI. Cystex Urinary Pain Relief Tablets are not meant to replace the care of a doctor, since there is no OTC remedy for urinary tract infections (UTIs) or self-treatment for UTIs. They require prescription medication to completely cure the infection. Contact your healthcare provider immediately if you suspect a urinary tract infection.