Diflunisal: a review of pharmacokinetic and pharmacodynamic properties, drug interactions, and special tolerability studies in humans.

Abstract
1 In the fasting state, peak plasma levels of diflunisal were achieved within 2 hours. The drug was not metabolized and almost totally excreted in the urine as unchanged or conjugated drug. The terminal plasma half-life was approximately 8 hours. These results support a twice daily dose regimen.