Elavil^® (amitriptyline hydrochloride) is a prescription medication used for the treatment of depression. The drug is part of a class of medications called tricyclic antidepressants. While it is not entirely clear how Elavil works, it is known that the drug affects several chemicals in the brain, including serotonin and norepinephrine. It is believed that maybe Elavil allows these chemicals to stay in the brain longer, which can help with depression symptoms. Besides the treatment of depression, Elavil also has a number of "off-label" uses. A few of these off-label Elavil uses include relieving chronic pain, preventing migraine headaches, and helping with ADHD or bulimia. Elavil comes in tablet form and is available in six strengths, ranging from 10 mg to 150 mg. If you happen to overdose on Elavil, seek medical attention immediately. Symptoms of an Elavil overdose may include vomiting, seizures, changes in heart rhythm (arrhythmia), or very low blood pressure (hypotension).