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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.
However, while determining an exact answer on how long do drugs stay in your system, one needs to take several other things into consideration like the amount of drug the person has taken, whether the drug was taken orally or injected in the body, the person's age, gender, etc.