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Deprecated: Implicit conversion from float 245.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 J+Sex+Med 2016 ; 13 (3): 338-49 Nephropedia Template TP
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Preclinical Abuse Potential Assessment of Flibanserin: Effects on Intracranial Self-Stimulation in Female and Male Rats #MMPMID26831817
Lazenka MF; Blough BE; Negus SS
J Sex Med 2016[Mar]; 13 (3): 338-49 PMID26831817show ga
INTRODUCTION: Flibanserin is a serotonin receptor subtype 1A (5HT1A) agonist and 2A (5HT2A) antagonist that has been approved by the Food and Drug Administration for treating female sexual interest/arousal disorder. Little is known about the abuse potential of flibanserin. AIM: This study examined abuse-related effects of flibanserin in rats using an intracranial self-stimulation (ICSS) procedure that has been used previously to evaluate abuse potential of other drugs. METHODS: Adult female and male Sprague-Dawley rats with electrodes implanted in the medial forebrain bundle were trained to lever press for electrical brain stimulation under a ?frequency-rate? ICSS procedure. In this procedure, increasing frequencies of brain stimulation maintain increasing rates of responding. Drugs of abuse typically increase (or ?facilitate?) ICSS rates and produce leftward/upward shifts in ICSS frequency-rate curves, whereas drugs that lack abuse potential typically do not alter or only decrease ICSS rates. Initial studies determined the potency and time course of effects on ICSS produced by acute flibanserin (1.0, 3.2 and 10.0 mg/kg). Subsequent studies determined effects of flibanserin (3.2?18 mg/kg) before and after a regimen of repeated flibanserin administration (5.6 mg/kg/day x 5 days). Effects of the abused stimulant amphetamine (1.0 mg/kg) were examined as a positive control. MAIN OUTCOME MEASURE: Flibanserin effects on ICSS frequency-rate curves in female and male rats were examined and compared to effects of amphetamine. RESULTS: Baseline ICSS frequency-rate curves were similar in female and male rats. Both acute and repeated administration of flibanserin produced only decreases in ICSS rates, and rate-decreasing effects of the highest flibanserin dose (10 mg/kg) were greater in females than males. In contrast to flibanserin, amphetamine produced an abuse-related increase in ICSS rates that did not differ between females and males. CONCLUSIONS: These results suggest that flibanserin has low abuse potential. Additionally, this study suggests that females may be more sensitive than males to rate-decreasing effects of high flibanserin doses.