List of products in the National Drug Code with proprietary name . This medication is used alone or with other medications to treat high pressure inside the eye due to glaucoma or other eye diseases (e.g., ocular hypertension). Lowering high pressure inside the eye helps to prevent blindness, vision loss, and nerve damage. This medication may also be used during certain eye surgeries and to reverse the effects of drugs used to enlarge the pupil (e.g., during an eye exam). Pilocarpine works by causing the pupil of the eye to shrink and decreasing the amount of fluid within the eye.