Most common side effects include dizziness,
drowsiness,
and swelling of extremities. On the other hand, amitriptyline or Elavil, is a tricyclic antidepressant. It is officially approved as a preventive medication for patients with frequent migraines and chronic fatigue syndrome. Common side effects is due to its anticholinergic activity such as weight gain, dry mouth, changes in appetite, drowsiness, nausea, constipation, insomnia and changes in sexual function.