Amitrip 75 mg tablet can cause side effects like weight gain, constipation, dry mouth, urinary retention and changes in blood pressure when taken for a longer duration. However, most of the common side effects caused by Amitrip 75 mg tablet do not require any medical attention and gradually subside on their own. You should take the medicine if your doctor has prescribed it for your condition for the recommended duration. If you develop persistent symptoms or severe allergies, report to your doctor immediately. Please consult your doctor for more information.