What is the medical use for Belladonna extract?

I know that belladonna (or deadly night shade) as anticholinergic properties. Anticholinergics are used in the treatment of such things as stomach cramps (like those ociated with irritable bowel syndrome) and incontinence (urinary leakage) in that is relaxes the smooth muscle of the bowels and bladder but I have heard in very small doses it is good as a fever reducer. Too much is a danger, of course. Even in theutic doses it can cause dry eyes, dry mouth, and constipation.