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The primary use of anticholinergic drugs is to block the action of acetylcholine in the body, which effectively reduces the activity of the parasympathetic nervous system. This mechanism is particularly useful in treating urinary incontinence because anticholinergics help to decrease bladder contractility and increase bladder capacity. By inhibiting the involuntary muscle contractions that trigger an urgent need to urinate, these medications offer significant relief for patients struggling with this condition.

Other options, such as enhancing cardiac output or treating heartburn symptoms, do not reflect the specific role of anticholinergic drugs. These medications are not designed to increase acetylcholine levels, which would lead to increased parasympathetic activity, rather than blocking it. Thus, the focus on treating urinary incontinence highlights the therapeutic benefits of anticholinergics in managing conditions linked to overactive bladder rather than other unrelated effects.