Drowsiness, dizziness, dry mouth, blurred vision, constipation, or trouble urinating may occur. Tell your doctor right away if you get sunburned or have skin blisters/redness. During the pregnancy this treatment should be used only when strongly necessary. Many people using this medication do not have serious side effects. Avoid cutting, crushing or chewing this medicine. Do not mix with soda or other carbonated beverages. Do not stop taking this medication without consulting your doctor. Also, you may experience symptoms such as mood swings, headache, and tiredness. This is not a complete list of possible side effects.