hyoscyamine (Hyomax) is an anticholinergic used to treat irritable bowel syndrome (IBS) and peptic ulcers. It controls muscle spasms, which can ease symptoms of IBS and allow for faster healing of ulcers. Hyomax SL is a sublingual tablet, also available as Symax SL and generic hyoscyamine. Get Hyoscyamine for as low as $2.00, which is 93% off the average retail price of $27.86 for the most common version, by using a GoodRx coupon.