Amitriptyline hydrochloride (Elavil^®) is approved to treat the symptoms of depression. Because this prescription medication is a tricyclic antidepressant, it may affect several chemicals in the brain (including serotonin and norepinephrine). It is possible to take too much amitriptyline. Make sure to seek immediate medical attention if you think you may have overdosed on amitriptyline. Some signs of an amitriptyline overdose can include vomiting, fever, and seizures.