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The frequency at which a certain drug is taken (drug abuse) and the drug tolerance capacity of the person also determine the duration of the drug in the body. Most commonly used drugs like codeine, used to relieve cough and pain, can also stay in the body for more than one day. The following is a chart showing the duration of drugs in the system, in case of prescription as well as drugs of abuse.
What Can Affect How Long Do Drugs Stay In Your System? A drug test does not look for the actual drug in your system. It looks for something called a metabolite. When you ingest a substance your body changes (metabolizes) that substance into one or more metabolites. It is these metabolites the drug tests looks to identify.