In 18 healthy volunteers, in a double-blind placebo-controlled study, we investigated of whether 14 days treatment with a therapeutic dose of ibopamine (3×100 mg/day p.o.), respectively its active metabolite epinine, would desensitize lymphocyte β2- or platelet α2-adrenoceptors, or α1- and β-adrenoceptor mediated (phenylephrine-and isoprenaline infusions, respectively), changes in systolic and diastolic blood pressure and heart rate. Ibopamine-treatment, which resulted in peak plasma epinine concentrations of 4-5 nmol·l-1, neither affected resting heart rate or blood pressure, nor any of the α- or β-adrenoceptor parameters measured. Since in man in general long-term administration of α- and β-adrenoceptor agonists desensitizes α- and β-adrenoceptors, the lack of any α- and β-adrenoceptor desensitizing effect of ibopamine suggests that, in the dose employed (3×100 mg per day), ibopamine does not exert α- or β-adrenoceptor agonistic effect in humans.

adrenoceptor function, chronic treatments, epinine, haemodynamics, healthy volunteers, Ibopamine
dx.doi.org/10.1007/BF00271373, hdl.handle.net/1765/64303
European Journal of Clinical Pharmacology
Department of Internal Medicine

Brodde, O.-E, Klusmann, J.-H, Wojcik, M, Man in't Veld, A.J, Boomsma, F, & Michel, M.C. (1993). Lack of desensitization of α-and β-adrenoceptor function during chronic treatment of healthy volunteers with ibopamine, an orally active dopamine receptor agonist. European Journal of Clinical Pharmacology, 44(3), 283–286. doi:10.1007/BF00271373