phentermine is a schedule 4 drug when did phentermine become a controlled substance

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Phentermine is a schedule 4 drug, when did phentermine become a controlled substance

phentermine is a schedule 4 drug ==> phentermine is a schedule 4 drug
phentermine is a schedule 4 drug is phentermine a schedule 1 drug phentermine schedule 4 when did phentermine become a controlled substance is phentermine 37.5 a controlled substance phentermine is a schedule 4 drug