Int J Clin Pharm Th
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Int J Clin Pharm Th · Sep 1995
Randomized Controlled Trial Clinical TrialRelative bioavailability of controlled-release oral morphine sulfate during naltrexone blockade.
The effect of naltrexone hydrochloride on the bioavailability of 60 mg controlled-release oral morphine sulfate in normal volunteers was determined using a randomized, 2-way crossover, analytically blinded study design. Although naltrexone did not qualitatively alter the concentration-time curve for controlled-release morphine, the area under the plasma morphine concentration-time curve from 0-24 h (AUC0-24) was significantly greater (p < 0.01) for morphine given with naltrexone (265 ng x h/ml) than for morphine given alone (215 ng x h/ml). Compared to morphine given alone, the apparent absorption half-life of morphine was decreased from 0.94-0.58 h (p = 0.01) and Cmax was increased from 28.17 ng/ml to 32.26 ng/ml (p = 0.04) during naltrexone blockade, whereas the Tmax and apparent elimination half-life of morphine were not significantly affected. The minimal differences in morphine bioavailability indicate naltrexone may be useful in comparative bioavailability studies of high-dose opioids in opioid-naive normal volunteers.
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Int J Clin Pharm Th · Sep 1995
Randomized Controlled Trial Comparative Study Clinical TrialComparative efficacy of diclofenac dispersible 50 mg and ibuprofen 400 mg in patients with primary dysmenorrhea. A randomized, double-blind, within-patient, placebo-controlled study.
Sixty female out-patients suffering from moderate to severe primary dysmenorrhea, aged 14-40 years (mean 27 years), entered this randomized, double-blind, 3-period, within-patient study, evaluating the efficacy and tolerability of diclofenac dispersible 46.5 mg (equivalent to 50 mg of diclofenac sodium), ibuprofen 400 mg and placebo taken up to 4 times daily for a maximum of 3 days. Pain relief was evaluated on a verbal rating scale (0 = none, 1 = slight, 2 = moderate, 3 = considerable, 4 = complete) at 0.5, 1,2,3,4,5 and 6 hours after the first dose; the weighted sum of pain relief scores over the 6-hour observation period was also investigated (TOTPAR-6). Pain intensity was assessed on a verbal rating scale (0 = nil, 1 = mild, 2 = moderate, 3 = severe) at baseline and at the above mentioned time points; the weighted sum of pain intensity differences at each time point was also analyzed (SPID-6). ⋯ Finally, adverse experiences were recorded throughout the study period. Analysis of covariance and Koch's adaptation of the Wilcoxon-Mann-Whitney rank sum test were used, where appropriate, for statistical analysis. Mean TOTPAR-6 values for diclofenac dispersible, ibuprofen and placebo were 16.5, 17.8 and 14.7, respectively.(ABSTRACT TRUNCATED AT 250 WORDS)