How Long Does Mephedrone Stay In Your System? -
Answer (1 of 5): How long does Mephedrone stay in your system? Generally speaking, most drugs will be out of your system within 4-5 days so if you have a drugs test coming up you should give yourself at least 5 days to ensure it is out of your system. If you are very worried about having drugs in your system it is a better idea to simply not take any drugs.
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