Ambrosio C, Stefanini E
Department of Neuroscience B.B. Brodie, University of Cagliari, Italy.
Eur J Pharmacol. 1991 May 17;197(2-3):221-3. doi: 10.1016/0014-2999(91)90526-v.
Flunarizine dose dependently inhibits the binding of both [3H]spiperone and [3H]SCH 23390 with Ki values of 112 +/- 9 and 532 +/- 39 nM, respectively. The inhibition of [3H]spiperone binding by flunarizine was competitive as revealed by the Schild plot. The results indicate that flunarizine is a fairly potent dopamine D2 receptor antagonist and offer a possible explanation for the extrapyramidal side-effects observed in patients treated with the drug.