Reading back through the thread, I see that you are giving probiotics. I think that's good.
Since the contrary was hinted at earlier, and mostly for the benefit of future readers, I'd like to offer a couple sources that show that injected antibiotics including ceftazidime "can have a major ecological impact on the intestinal flora" (van Ogtropp et al, p. 980), and though the studies linked below are on mammals (I couldn't find any studies on reptiles), van Ogtropp's mouse study suggests that non-coprophagic species should be expected to show more disruption of gut flora (also p. 980). Bhalodi et al found gut flora suppression after ceftazimide administration "as expected", so there's apparently little academic dispute on this.
M.L. van Ogtropp et al, Modulation of the intestinal flora of mice by parenteral treatment with broad-spectrum cephalosporins, Antimicrobial Agents and Chemotherapy Volume 35, Issue 5 May 1991.
Kemmerich, et al, Multiple-dose pharmacokinetics of ceftazidime and its influence on fecal flora, Antimicrobial Agents and Chemotherapy Volume 24, Issue 3 Sep 1983.
Bhalodi, et al, Impact of Antimicrobial therapy on the gut microbiome, Journal of Antimicrobial Chemotherapy, Volume 74, Issue Supplement_1, January 2019
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