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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.
As higher doses are used over time, physical dependence and addiction develop. With physical dependence, the body has adapted to the presence of the drug and withdrawal symptoms may occur if use is reduced or stopped.he short-term effects of heroin abuse appear soon after a single dose and disappear in a few hours. After an injection of heroin, the user reports feeling a surge of euphoria (ârushâ) accompanied by a warm flushing of the skin, a dry mouth, and heavy extremities.