Trimethoprim/sulfamethoxazole and metabolic acidosis in HIV-infected patients.

Ann Pharmacother

Section of Internal Medicine, Hospital of Laredo, Cantabria, Spain.

Published: February 1998

Objective: To describe a retrospective study of six HIV-positive individuals with compensated metabolic acidosis while receiving intravenous trimethoprim/sulfamethoxazole (TMP/SMX).

Case Summary: Six HIV-infected patients were treated for Pneumocystis carinii pneumonia (PCP) with high-dose intravenous TMP/SMX. In spite of a favorable clinical and radiologic course, all six patients developed compensated metabolic acidosis 3-5 days after the start of treatment. This potential complication of TMP/SMX use was successfully managed with conservative treatment (cessation of therapy with or without additional administration of intravenous bicarbonate).

Discussion: TMP/SMX is first-line therapy for PCP in HIV-positive individuals, despite a high frequency of toxic effects in these patients. In addition to the cases reported here, only two other reports of metabolic acidosis secondary to TMP/SMX use in HIV-infected patients have been published in the literature. The precise mechanism of this untoward effect is not fully understood, although renal tubular acidosis induced by TMP/SMX could be implicated.

Conclusions: TMP/SMX toxicity should be considered in the differential diagnosis of HIV-infected patients with acute metabolic acidosis. Metabolic acidosis can be expected to resolve shortly after discontinuation of the drug.

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http://dx.doi.org/10.1345/aph.17042DOI Listing

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