Older adults are more likely to experience certain side effects with antispasmodics, including dry mouth, nose, throat or skin. Other symptoms that are more common in older adults include confusion or memory loss, constipation, difficulty urinating, drowsiness, and unusual excitement, nervousness, restlessness or irritability. Eye pain in older adults using antispasmodics may indicate glaucoma (an eye disease that damages the optic nerve), though most forms of glaucoma are painless.