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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.
The drug flagyl or metronidazole stays in the system 3 days after discontinuation.Dont drink alcohol till 3 days after you stop it [ Source: http://www.chacha.com/question/how-long-does-flagyl-stay-in-your-body ]. More Answers to  How long does flagyl stay in your body .his means that every 8 hours, the amount in the body is cut in half. We usually give 4-5 half-lives to say that the drug is gone (it will be about 95% gone by then), so 32-40 hours for metronidazole (Flagyl).