← Health 2nd Semester Test Chapter 23 Export Options Alphabetize Word-Def Delimiter Tab Comma Custom Def-Word Delimiter New Line Semicolon Custom Data Copy and paste the text below. It is read-only. Select All Vaccines preparation introduced into the body to stimulate an immune response Analgesics also called pain relievers; Range from aspirin to codeine or morphine Antidepressants help regulate brain chemistry Side Effects reactions to medicines other than the one intended Tolerance the body becomes used to the effect of medicine; body requires larger doses to produce the same effect Withdrawal when a person stops using a medicine in which they had a chemical dependence Overdose strong, sometimes fatal, reaction to taking a large amount of a drug Sometimes through a needle; increases chances of Hepatitis B or HIV 2 Factors that Influence Decisions about Drugs Peer Pressure Media Messages Stimulants Speeds up CNS Hallucinogens causes paranoia; hallucinations Narcotics relieve pain Depressants slows down CNS Ex of Stimulants Caffeine Nicotine Ex of Hallucinogens LSD PSP Ex of Narcotics Heroin Ex of depressants Alcohol Ruffies