Those who have overdosed on Adderall may experience restlessness, muscle twitches, and rapid breathing. Overdose symptoms can range from mild depression to panic and aggressive behavior. Some individuals may also experience dark colored urine, nausea, lightheadedness, convulsions, and coma. Symptoms of an overdose can also be life threatening and may include coma. If you suspect that you've overdosed on Adderall, seek medical attention immediately.