Cocaine withdrawal occurs when someone who has used a lot of cocaine cuts down or quits taking the drug. Symptoms of withdrawal can occur even if the user is not completely off cocaine and still has some| medlineplus.gov
An electrocardiogram (ECG) is a test that records the electrical activity of the heart.| medlineplus.gov
Learn more about the health effects of cocaine, a stimulant drug made from the leaves of the coca plant.| National Institute on Drug Abuse