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Zidovudine absorption was evaluated in HIV seropositive patients with (n = 15) and without diarrhoea (n = 20) in a standardised prospective pharmacokinetic study using single oral 200 mg doses. Zidovudine was rapidly absorbed with large peak variation (Cmax: 1.10 +/- 0.43 mg/L). There were no significant associations between pharmacokinetic parameters and presence of diarrhoea, CD4 counts, red blood cell folate concentrations, stool cultures/leucocytes or the lactulose/mannitol absorption test. Mean diarrhoea AUC (mg/L.h) was 1.13 +/- 0.30 and 1.07 +/- 0.36 in non-diarrhoeal patients. Antidiarrhoeals increased AUC and Cmax values in a small, non statistically significant subset of diarrhoea patients. Although zidovudine absorption varies significantly, our data do not support dosage individualisation based on any of the above parameters.

Zidovudine absorption and small intestinal function in HIV seropositive patients