In contrast, toxicity can

occur when an interaction leads to increased antiretroviral concentrations or the patient receives a higher dose than the correct one. Resistance or toxicity is more likely to occur when the error is extended in time or when the error has not been resolved before the patient’s discharge. Some authors have confirmed that HAART-related errors are common in hospitalized patients and that admission of an HIV-infected patient by a physician not specialized in infectious diseases could be a risk factor for drug-related problems [4]. The aims of this study were to identify and describe HAART-related PLX3397 molecular weight errors in medication prescribed to HIV-infected patients admitted to a tertiary teaching hospital and VE-821 cell line to determine the degree of acceptance of the pharmacist’s interventions. We conducted an observational, prospective, 1-year study (between 1 January and 31 December 2007). Twice a week (on Tuesday and Thursday),

a pharmacy resident trained in HIV pharmacotherapy and supported by a staff infectious diseases pharmacist identified patients aged at least 18 years who had been admitted to the Hospital Clinic (a 750-bed tertiary teaching hospital in Barcelona, Spain) and prescribed HAART. A list was made of all inpatients who were prescribed antiretroviral drugs. Admissions made on Fridays, at weekends and on Mondays were recorded on Tuesday afternoon. Admissions made on Tuesdays, Wednesdays and Thursdays were recorded on Thursday afternoon. The following data were recorded for all patients: age, gender, risk factors ID-8 for HIV infection, admitting service, serum creatinine level and liver function (serum albumin, total bilirubin, transaminases, and international normalized ratio). For those patients with an altered creatinine value (>1.2 mg/dL), the glomerular filtration rate was calculated using the Cockcroft–Gault

equation [5]. For those patients with any abnormal liver function test result, the admission report was checked to determine whether they had cirrhosis, in which case the Child–Pugh score [6,7] was also recorded. Concomitant medication was reviewed twice weekly to check for drug–drug interactions. HAART errors were classified as follows: contraindicated or not recommended drug–drug combinations, incorrect or incomplete antiretroviral regimen, omitted dose, incorrect dose (not matching the outpatient prescription), lack of dose reduction for renal or hepatic impairment and incorrect schedule [8]. In Spain, HIV-infected patients pick up their antiretroviral medication in the outpatient pharmacy unit of the hospital that they attend for care. Therefore, it was easy for us to determine the patient’s HAART regimen.