For example here is one from 2002--
In 2002, FDA sampled 29 drugs from compounding pharmacies and found that nine were seriously subpotent and one was superpotent, says Fred Richman, acting chief for FDA's Prescription Drugs Branch. In contrast, the failure rate for commercially available drugs is less than 2%. "This survey is not in any way necessarily reflective of the whole compounding industry," he says, "but it suggests to us that states should take a look at potency as well as sterility as possible problems with some compounded drugs."
quoted from here
In 2002, FDA sampled 29 drugs from compounding pharmacies and found that nine were seriously subpotent and one was superpotent, says Fred Richman, acting chief for FDA's Prescription Drugs Branch. In contrast, the failure rate for commercially available drugs is less than 2%. "This survey is not in any way necessarily reflective of the whole compounding industry," he says, "but it suggests to us that states should take a look at potency as well as sterility as possible problems with some compounded drugs."
quoted from here
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