Topic Overview

Heroin is an illegal, highly addictive drug. It is a white or brown powder or a black, sticky substance (black tar heroin). It can be sniffed, snorted, smoked, or injected into a muscle or vein. It is often mixed (cut) with other drugs or substances, such as sugar or powdered milk. It may also be cut with poisons, such as strychnine. Other names for heroin are smack, junk, H, and ska.


Heroin is often used along with other drugs, especially cocaine and alcohol. Some people snort alternate lines of heroin and cocaine, which is called crisscrossing. Or they may inject it with another drug (speedball).

With repeated use, heroin causes the person to need higher and higher doses of the drug to get the same effect (tolerance). It also causes the person's body to need the drug to function (physical dependence), which leads to withdrawal symptoms within a few hours if the person stops using it. Physical and psychological dependence can develop within a few weeks if the drug is used daily.

Several health problems can develop with heroin abuse, including:

  • Bacterial infections of the blood vessels and heart valves.
  • Liver or kidney disease.
  • Lung problems, such as pneumonia and tuberculosis, from poor health.

Heroin can be detected in the urine for up to 24 hours and in blood for as long as 48 to 72 hours after use.

If you are worried that you or someone you know will take too much heroin, talk to your doctor about a naloxone rescue kit. A kit can help, and even save your life, if you take too much heroin.

Signs of use

  • Possession of injecting supplies, called an outfit or rig, that may consist of a spoon or bottle cap to cook the drug, syringe or needle to inject it, tourniquet or towel to find a vein, cotton, and matches to heat and dissolve the drug in water
  • Restlessness, sleepiness, diarrhea, vomiting, chilled feelings, and leg movements if the person is dependent on the drug and has not had it recently


ByHealthwise Staff
Primary Medical ReviewerPatrice Burgess, MD - Family Medicine
Adam Husney, MD - Family Medicine
Specialist Medical ReviewerPeter Monti, PhD - Alcohol and Addiction

Current as ofFebruary 24, 2016