BISMUTH SUBSALICYLATE; METRONIDAZOLE; TETRACYCLINE treats ulcers caused by H. pylori bacteria. It works by killing or preventing the growth of bacteria. It is a combination medication that contains a salicylate and a tetracycline antibiotic. Get Helidac for as low as $930.56, which is 18% off the average retail price of $1,140.06 for the most common version, by using a GoodRx coupon.