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British Journal of Anaesthesia, 1995, Vol. 74, No. 3 311-314
© 1995 The Board of Management and Trustees of the British Journal of Anaesthesia

research-article

Interactions between opioid drugs and propofol in laboratory models of seizures

I. AHMAD, MB, BS, MSC and B. J. PLEUVRY, MSC, PHD, MRPHARMS

Department of Anaesthetics and School of Biological Sciences 1.124, Stopford Building, University of Manchester Oxford Rd, Manchester M13 9PT.

Correspondence to B.J.P.

Propofol (i.v. and i.p.) exhibited anticonvulsant activity in three models of seizure in the mouse, induced by bicuculline, kainic acid and N-methyl-DL-aspartic acid (NMDLA). Morphine, pethidine and fentanyl, which showed a biphasic doseresponse relationship with respect to seizure modulation, abolished the anticonvulsant activity of propofol to exhibit their own intrinsic activity in proconvulsant doses. This occurred with very low doses of fentanyl and pethidine (15µgkg–1 and 0.5 mg kg–1, respectively) in the NMDLA model. Thus it appears that propofol has anticonvulsant activity only when a convulsion is elicited directly; it does not prevent the actions of compounds that lower seizure thresholds to convulsant stimuli. The anticonvulsant doses of morphine and fentanyl did not summate with the anticonvulsant activity of propofol. However, there was some evidence of summation of anticonvulsant activity between pethidine and propofol in the NMDLA model. (Br. J. Anaesth. 1995; 74: 311–314)


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