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Short-Term Effects of Heroin. Often injected, the immediate effects of heroin are to modulate pain perception. As a street drug, dosing is impossible to fully control, and the side effects of decreased heart rate and breathing pose immense risk to users.
Heroin is a pain-killing drug, which is derived from the dried milk of the opium poppy and white crystals. Heroin belongs to a group of drugs known as opiates, other opiates i â¦ ncludemorphine and methadone. Heroin is an addictive opioid substance. 2  Most often, it is injected directly into the user's vein via a needle. 3  Heroin is unlike other drugs such as ecstasy and alcohol in thâ¦. 4  Major Long Term Effects of Heroin Use Every illegal drug has both short-term and long-term effects.