This class of medicines affects the nerve cells or nerve fibers and includes drugs for depression, anxiety, and nervousness. Examples of anticholinergics include propantheline (Pro-banthine) and dicyclomine (Bentyl). Examples of antidepressants include amitriptyline (Elavil and Endep), and nortriptyline (Aventyl and Pamelor). Medicines for relieving the symptoms of Parkinson's disease also are in this category. Examples include levodopa (Dopar) and carbidopa and levodopa combination (Sinemet).