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.
The pleasurable sensation from heroin is called a rush, and the
intensity of the rush depends on how much drug was taken and how rapidly the
drug entered the brain. When a person injects heroin directly into a vein, the
rush occurs within seconds, whereas it takes at least 10 minutes when the drug
is sniffed or smoked. Along with the rush, the person using heroin usually has
a warm flushing of the skin, small pupils, watery eyes, runny nose, dry mouth,
and a heavy feeling in the arms and legs. Heroin may also cause nausea,
vomiting, and severe itching. Soon after the rush, the person feels drowsy and
very relaxed. Breathing and heart rate slow, thinking becomes cloudy, and the
person may fall into a state like a trance that can last 4 to 6 hours.
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
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,