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  • Title: Calcium channel inhibitors prevent apomorphine- and oxytocin-induced penile erection and yawning in male rats.
    Author: Argiolas A, Melis MR, Gessa GL.
    Journal: Eur J Pharmacol; 1989 Aug 03; 166(3):515-8. PubMed ID: 2806374.
    Abstract:
    The effect of i.p. injection of the calcium channel inhibitors, verapamil, flunarizine, nifedipine, nimodipine and nicardipine, on penile erection and yawning induced by the dopamine agonist, apomorphine, or by oxytocin was studied in male rats. The five compounds antagonized in a dose-dependent manner the behavioral responses induced either by apomorphine or oxytocin. Nimodipine and nicardipine were found to be the most potent, being active in doses between 5 and 20 mg/kg, while nifedipine, verapamil and flunarizine were active in doses higher than 15 mg/kg. The results suggest that calcium is involved in the expression of the above-mentioned behavioural responses.
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