Abstract
Foscarnet is an investigational antiviral agent that has been used effectively in the treatment of cytomegalovirus (CMV) retinitis in AIDS patients. However, it has not been readily available to AIDS patients with renal insufficiency because its major side effect is nephrotoxicity. In this report, the efficacy, safety, and dosing requirements of foscarnet in a hemodialysis-dependent patient with CMV retinitis are presented. Foscarnet was administered for 14 weeks, at an initial dosage of 60 mg/kg after each dialysis session. Plasma concentrations were monitored weekly, and the dosage was adjusted to maintain peak plasma levels in the range of 500-800 microM. Although some laboratory abnormalities occurred (a preexisting anemia continued, serum calcium and phosphorus decreased, and ionized calcium increased), they did not limit therapy. Foscarnet is a potentially useful alternative treatment for CMV retinitis in hemodialysis-dependent AIDS patients.
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