Part of a class of medications called tricyclic antidepressants, Elavil^® (amitriptyline hydrochloride) is used to treat depression. Besides treating depression, Elavil is also used "off-label" to treat a number of other conditions. Among these off-label uses for Elavil are preventing migraine headaches and helping with bedwetting, ADHD, fibromyalgia, and bulimia. The medication is also effective at helping people quit smoking. Elavil comes in a tablet form that is usually taken by mouth one to three times a day. The tablets should be kept in an airtight container and stored at room temperature, away from moisture and heat. If you happen to overdose on Elavil, seek medical attention immediately. A few symptoms of an Elavil overdose include vomiting, seizures, changes in heart rhythm (arrhythmia), or very low blood pressure (hypotension).