Document Classification

Section Type: RESULTS

Text: After control, rifampin, troleandomycin and grapefruit juice, respectively, area under the curve of plasma fentanyl versus time was 5. 9 + / - 3. 7, 2. 2 + / - 0. 8, * 10. 4 + / - 8. 9, * and 5. 8 + / - 3. 3 h x ng/ml ; norfentanyl/fentanyl plasma area under the curve ratios were 0. 92 + / - 0. 63, 3. 2 + / - 1. 8, * 0. 08 + / - 0. 14, * and 0. 67 + / - 0. 33 (* P < 0. 05 versus control).