Severity: Major. You should check with your doctor immediately if any of these side effects occur when taking amitriptyline:
- abdominal or stomach pain
- agitation
- black, tarry stools
- bleeding gums
- blood in urine or stools
- blurred vision
- burning, crawling, itching, numbness, prickling, “pins and needles”, or tingling feelings
- change in consciousness
- changes in patterns and rhythms of speech
- chest pain or discomfort
- chills