Almost all the antiretroviral-related errors occurred at admission (15; 75%). The error occurred in the HIV clinic in only five cases and was not resolved on admission (four cases of lack of dosage reduction in patients with renal impairment; one

case of a contraindicated interaction). Of 112 admissions to services other than infectious diseases in which antiretroviral agents had been prescribed, 39 had at least one antiretroviral drug-related error (34.8%), compared with 21 out of 135 admissions in the infectious diseases unit (15.6%). In the multivariate analysis, the factors associated with an increased risk of HAART-related problems (Table 4) were renal impairment [OR 3.95; 95% confidence interval (CI) 1.39–11.23], treatment with atazanavir (OR 3.53; 95% CI 1.61–7.76) and admission to a unit other than an infectious

diseases unit (OR 2.50; 95% CI 1.28–4.88). Prescription of a nonnucleoside reverse Z-VAD-FMK chemical structure transcriptase inhibitor was a protective factor (OR 0.33; 95% CI 0.13–0.81). No statistical relationship was found between HAART-related problems and the following factors: age, sex, risk group, TGF-beta inhibitor liver impairment, nucleoside reverse transcriptase inhibitor-based HAART, a protease inhibitor other than atazanavir, and being treated with an antiretroviral with different presentations. The most common intervention by the pharmacist was a footnote on the prescription (45 of 60; 75%), followed by a telephone call to the attending physician (22 of 60; 36.7%) or nurse (6 of 60; 10%). The pharmacist made an intervention in all of the 60 errors detected. This was well accepted in most cases (55 of 60; 91.7%), and the error was resolved. Five interventions were not accepted (8.3%):

lack of dosage reduction in patients Rapamycin purchase with renal impairment (three cases), lack of efavirenz dosage reduction in a patient with hepatic impairment (one case), and a contraindicated combination (atazanavir and omeprazole; one case). There is evidence that antiretroviral errors are common during hospital admission. Mok et al. [4] prospectively reviewed the medical records of 83 HIV-infected patients who received antiretroviral therapy for 20 months and identified a total of 176 drug-related problems in 71 patients (86% of the patients had at least one problem associated with their antiretroviral regimen). Over 4 months, Pastakia et al. [12] prospectively evaluated antiretroviral prescribing errors in 68 hospitalized HIV-infected patients and found that there was at least one error in 72% of cases; in 56% of cases, the error had the potential to cause moderate to severe discomfort or clinical impairment. In a retrospective study, Purdy et al. [13] identified 108 clinically significant prescribing errors involving antiretrovirals during a 34-month study period in hospitalized HIV-infected patients. Overall, errors occurred in 5.8% of inpatients prescribed antiretroviral medication. Rastegar et al.