DURING THE last ten years there have appeared a considerable number of well- designed and controlled studies which demonstrate that the rate and/or extent of absorption of a drug may differ among products from different manufacturers.These reports have dealt with tetracycline,' oxytetracycline,2 3 chloramphenicol,4 ampicillin,5 diphenyl'hydantoin,6 and digoxin," among many
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Levy et al. (1974) studied this question.
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