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codeine. Heroin is illegal and cannot even be obtained with a <br />physician's prescription. <br />Most medical problems are caused by the uncertain dosage level, <br />the use of unsterile needles, contamination of the drug, or the <br />combination of a narcotic with other drugs. These dangers depend <br />on the specific drug, its source and the way it is used. <br />Other Effects: <br />* short -lived euphoria <br />* impaired driving ability <br />* drowsiness, followed by sleep <br />* constipation <br />* decreased physical activity <br />* reduced vision <br />* change in sleeping habits <br />* possible death <br />Phencyclidine or PCP, also called "angel dust ", was developed as <br />a surgical anesthetic in the late 1950s. Later, due to its <br />unusual side effects in humans, it was restricted to use as a <br />veterinary anesthetic and tranquilizer. Today, it has no lawful <br />use and is no longer legally manufactured. <br />PCP is a very dangerous drug. It can produce violent and bizarre <br />behavior even in people otherwise not prone to such behavior. <br />More people die from accidents caused by erratic and <br />unpredictable behavior produced by the drug than from the drug's <br />direct effect on the body. <br />PCP scrambles the brain's internal stimuli and alters how users <br />see and deal with their environment. Routine activities such as <br />driving and walking become very difficult. <br />Low doses produce a rush, sometimes associated with a feeling of <br />numbness. Increased doses produce an excited, confused state <br />including any of the following: muscle rigidity, loss of <br />concentration and memory, visual disturbances, delirium, feelings <br />of isolation and convulsions. <br />Other Effects: <br />* impaired driving ability <br />* drowsiness <br />* perspiration <br />* repetitive speech patterns <br />* incomplete verbal responses <br />* blank stare <br />* thick, slurred speech <br />* involuntary eye movement <br />Page 63 <br />