Background: Previously, we validated the mouse thigh infection model to test the therapeutic equivalence of\ngeneric antibiotic products. Here, our aim was to compare the in vivo efficacy of amikacin products in clinical use in\nColombia using this animal model.\nResults: All except one generic product had the same in vitro potency, judging by the lack of differences on MIC\nand MBC compared with the innovator. However, eight of nine generic products failed in the neutropenic mouse\nthigh infection model to achieve the innovator�s maximum effect (Emax � 5.65 for the generics vs. 6.58 log10 CFU/g for\nthe innovator) against Escherichia coli SIG-1, after subcutaneous treatment every 6 h with doses ranging from 1.5 to\n3072 mg/kg per day.\nConclusion: As we demonstrated previously with other antibiotics such as vancomycin, gentamicin and oxacillin,\nthe generic products of amikacin failed the in vivo efficacy testing. The therapeutic equivalence should be assessed\nin vivo before clinical approval of generic products.
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