Flibanserin

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Flibanserin
File:Flibanserin-structural.svg
Systematic (IUPAC) name
1-(2-{4-[3-(trifluoromethyl)phenyl]piperazin-1-yl}ethyl)-1,3-dihydro-2H-benzimidazol-2-one
Clinical data
Routes of
administration		 Oral
Legal status
Legal status
  • Uncontrolled
Identifiers
CAS Number 167933-07-5
ATC code none
PubChem CID 6918248
ChemSpider 5293454
Chemical data
Formula C20H21F3N4O
Molar mass 390.40 g/mol[[Script error: No such module "String".]]
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Flibanserin (code name BIMT-17; proposed trade name Girosa) is a drug that is currently being investigated by Boehringer Ingelheim as a novel, non-hormonal treatment for pre-menopausal women with Hypoactive Sexual Desire Disorder (HSDD).[1][2] HSDD is the most commonly reported female sexual complaint and characterized by a decrease in sexual desire that causes marked personal distress and/or personal difficulties. According to prevalence studies about 1 in 10 women reported low sexual desire with associated distress, which may be HSDD.[3] The neurobiological pathway of female sexual desire involves interactions among multiple neurotransmitters, sex hormones and various psychosocial factors. Sexual desire is modulated in distinct brain areas by a balance between inhibitory and excitatory neurotransmitters, serotonine acting as an inhibitor while dopamine and norepinephrine act as a stimulator of sexual desire.[4][5] Flibanserin is a 5-HT1A receptor agonist and 5-HT2A receptor antagonist that had initially been investigated as an antidepressant.[6][7] Preclinical evidence suggests that flibanserin targets these receptors preferentially in selective brain areas and helps to restore a balance between these inhibitory and excitatory effects.[5][8] HSDD has been recognized as a distinct sexual function disorder for more than 30 years.[9]

Mechanism of action

The proposed mechanism of action refers back to the Kinsey dual control model.[10] Several sex steroids, neurotransmitters, and hormones have important excitatory or inhibitory effects on the sexual response. Among the neurotransmitters, the excitatory activity is driven by dopamine and norepinephrine, while the inhibitory activity is driven by serotonin. The balance between these systems is relevant for a healthy sexual response. By modulating these neurotransmitters in selective brain areas, flibanserin, a 5-HT1A receptor agonist and 5-HT2A receptor antagonist, is likely to restore the balance between these neurotransmitter systems.[5][8]

Clinical trials

Several large pivotal Phase III studies with Flibanserin were conducted in the USA, Canada and Europe.[11] They involved more than 5,000 pre-menopausal women with generalized acquired Hypoactive Sexual Desire Disorder (HSDD). The results of the Phase III North American Trials demonstrated that

Although the two North American trials that used the flibanserin 100 mg qhs dose showed a statistically significant difference between flibanserin and placebo for the endpoint of [satisfying sexual events], they both failed to demonstrate a statistically significant improvement on the co-primary endpoint of sexual desire. Therefore, neither study met the agreed-upon criteria for success in establishing the efficacy of flibanserin for the treatment of [Hypoactive Sexual Desire Disorder].[12]

These data were first presented on November 16, 2009 at the congress of the European Society for Sexual Medicine in Lyon, France.[13] The women receiving Flibanserin reported that the average number of times they had “satisfying sexual events” rose from 2.8 to 4.5 times a month. However, women receiving placebo reported also an increase of “satisfying sexual events” from 2.7 to 3.7 times a month. Evaluation of the overall improvement of their condition and whether the benefit was meaningful to the women, showed a significantly higher rate of a meaningful benefit in the flibanserin-treated patient group versus the placebo group.[14] The onset of the Flibanserin effect was seen from the first timepoint measured after 4 weeks of treatment and maintained throughout the treatment period.[15] The overall incidence of adverse events among women taking flibanserin was low, the majority of adverse events being mild to moderate and resolved during the treatment. The most commonly reported adverse events included dizziness, nausea, fatigue, somnolence and insomnia.[11]

FDA approval

On June 18, 2010 a federal advisory panel to the FDA unanimously voted against recommending approval of Flibanserin. Earlier in the week a FDA staff report also recommended non approval of the drug. While the FDA still might approve Flibanserin, in the past, negative panel votes tended to cause the FDA not to approve.[16]

See also

References

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External links

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Adrenergics
Androgens
Dopaminergics
Melanocortins
PDE5 Inhibitors
Others
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  1. ↑ Lua error in package.lua at line 80: module 'Module:Citation/CS1/Suggestions' not found.
  2. ↑ Lua error in package.lua at line 80: module 'Module:Citation/CS1/Suggestions' not found.
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  9. ↑ American Psychiatric Association. Sexual and gender identity disorders. In: American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders. 4th ed. Washington, DC: American Psychiatric Association; 2000:493–538.
  10. ↑ Janssen, E, Bancroft J. The dual control model: The role of sexual inhibition & excitation in sexual arousal and behavior In Janssen, E. (Ed). (2006). The Psychophysiology of Sex. Bloomington, IN:Indiana University press.
  11. ↑ 11.0 11.1 http://www.fda.gov/downloads/AdvisoryCommittees/CommitteesMeetingMaterials/Drugs/ReproductiveHealthDrugsAdvisoryCommittee/UCM215437.pdf, accessed June 16th 2010
  12. ↑ page 38, http://www.fda.gov/downloads/AdvisoryCommittees/CommitteesMeetingMaterials/Drugs/ReproductiveHealthDrugsAdvisoryCommittee/UCM215437.pdf, accessed June 17th 2010
  13. ↑ Jolly E, Clayton AH, Thorp J, et al. Efficacy of flibanserin 100 mg qhs as a potential treatment for Hypoactive Sexual Desire Disorder in pre-menopausal women. Oral presentation at the European Society of Sexual Medicine Congress, November 2009.
  14. ↑ Jolly E, Thorp J, Clayton AH, et al. Patients’ Perspective of Efficacy of Flibanserin in Premenopausal Women with HSDD. Oral presentation at the 58th Annual Clinical Meeting of The American College of Obstetricians and Gynecologists, May 2010.
  15. ↑ Simon JA, Thorp J, Katz M et al. Onset of Efficacy of Flibanserin in Premenopausal Women with Hypoactive Sexual Desire Disorder. Abstract presented at the 58th Annual Clinical Meeting of The American College of Obstetricians and Gynecologists, May 2010.
  16. ↑ "Drug for sexual desire disorder opposed by panel". New York Times. 18 June 2010. 
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