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. 1993 May;37(5):1056–1060. doi: 10.1128/aac.37.5.1056

Pyrimethamine inhibits renal secretion of creatinine.

M Opravil 1, G Keusch 1, R Lüthy 1
PMCID: PMC187895  PMID: 8517692

Abstract

The mechanism of increased serum creatinine after administration of pyrimethamine and dapsone was evaluated for six healthy volunteers. Serum parameters, urine sediment, and clearances of creatinine, inulin, and para-aminohippurate were assessed prior to and 28 h after the ingestion of a single, combined dose of 100 mg of pyrimethamine and 200 mg of dapsone. In a second series, the same renal function tests were performed for nine human immunodeficiency virus-infected men before and after 1 month of prophylactic treatment with a weekly dose of 75 mg of pyrimethamine and 200 mg of dapsone to evaluate sustained effects on renal function. Serum creatinine increased within 28 h from 81 +/- 14 to 102 +/- 16 mumol/liter (P = 0.002) in the healthy volunteers. Blood urea nitrogen, beta 2-microglobulin, and urine remained normal. Creatinine clearance decreased from 125 +/- 27 to 91 +/- 26 ml/min (P < 0.02) without changes in inulin clearance. The effect was reversible within 21 days and attributable to pyrimethamine, as determined by administration of each drug alone. The sustained effect of four doses of pyrimethamine and dapsone in human immunodeficiency virus-infected patients consisted of an analogous rise in serum creatinine from 69 +/- 17 to 87 +/- 32 mumol/liter (P < 0.05). Both creatinine and inulin clearances, however, were unchanged, representing a new equilibrium between creatinine production and elimination at a higher level in serum. Pyrimethamine, thus, may reversibly inhibit renal tubular secretion of creatinine without affecting the glomerular filtration rate. This physiologic effect in pyrimethamine-treated patients must be differentiated from possible organ-related nephropathies.

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Selected References

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