Pharmacokinetics of meptazinol in man following repeated intramuscular administration
1982
A study was performed in 6 healthy volunteers to determine whether 50 mg intramuscular doses of meptazinol repeated four hourly for 24 h would lead to accumulation of the drug. The first dose of meptazinol was rapidly absorbed with a subsequent mean (± SD) elimination half-life of 1.6±0.33 h. This value was unaffected by the administration of intermediate doses. There was no significant accumulation of the drug; 95% of the steady-state plasma concentration was achieved after a mean (± SD) of 1.9±0.39 and 99% after a mean (± SD) of 2.9±0.63 doses. These findings are consistent with the theoretical prediction for a rapidly absorbed drug with a plasma elimination half-life of 1.6 h. No clinically relevant changes were seen in pulse blood pressure, haematological or biochemical screens. Reported side effects were of a subjective and minor nature.
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