Summary
Actions and interactions of buprenorphine (BUP) and amitriptyline (AMI) on performance and respiration were studied double-blind and cross-over in 12 healthy volunteers. After one-week pretreatments with AMI or placebo, the subjects received on Day 8 placebo, BUP or AMI so that the final treatments were 1) placebo, 2) acute AMI 50 mg, 3) acute BUP, 4) subchronic AMI + acute BUP and 5) subchronic AMI. The subacute treatments were started at two-week intervals.
A Mapleson D rebreathing circuit including a pneumotachograph and an infrared capnograph was employed to study drug effects on respiration. Minute volume and end-tidal carbon dioxide as well as psychomotor performance were measured and the blood samples taken on Day 8 before the drug intake and 2 and 4 h thereafter. The performance tests included tracking, choice reaction, flicker fusion, exophoria, nystagmus, digit symbol substitution and the subjective assessment of mood.
BUP depressed respiration, and subchronic AMI increased this depression. Both BUP and acute AMI 50 mg each alone impaired various measures of performance and rendered the subjects drowsy, feeble, mentally slow and muzzy but subchronic AMI did not enhance BUP effects. BUP increased plasma prolactin levels similarly after both pretreatments.
The results suggest that both BUP and AMI moderately affect psychomotor performance but the interaction between these agents is mild and restricted mainly to respiration.
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Saarialho-Kere, U., Mattila, M.J., Paloheimo, M. et al. Psychomotor, respiratory and neuroendocrinological effects of buprenorphine and amitriptyline in healthy volunteers. Eur J Clin Pharmacol 33, 139–146 (1987). https://doi.org/10.1007/BF00544557
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DOI: https://doi.org/10.1007/BF00544557