CITRIC ACID; GLUCONO-DELTA-LACTONE; MAGNESIUM CARBONATE is used to treat some types of bladder stones by making the urine more acidic. This medicine may also be used to keep urinary catheter lines free from blockages.\n \nThis medicine may be used for other purposes; ask your health care provider or pharmacist if you have questions. Get Renacidin for as low as $180.26, which is 29% off the average retail price of $253.40 for the most common version, by using a GoodRx coupon.