In this experiment, the researchers develop tolerance in the rats by repeatedly injecting them with heroin during the pretest sessions.
When a person's body or brain no longer reacts to a prescription or recreational drug in the same manner it once did, they are said to have developed drug tolerance. When someone takes a certain substance for a long time, they frequently develop a tolerance to it.
When a person's body can no longer operate normally without taking a specific amount of a drug, they are said to be drug dependent. When a person has been taking the same medication for a long time, this often happens. People who have a reliance may develop an addiction to the drug for which they have a reliance.
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