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Former Propecia Users May Have Underlying Neurobiological Abnormalities

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Washington, DCA recent study of men experiencing persistent sexual dysfunction after discontinuing finasteride, the active ingredient in the hair loss treatment medication Propecia, suggests there may be "underlying neurobiological abnormalities" affecting former finasteride users who experience sexual problems.

Lawsuits against Merck & Co., the maker of Propecia, have been filed in the US and Canada, alleging that the medication causes serious side effects, including a risk of sexual dysfunction and mental and emotional problems. Plaintiffs allege in lawsuits that Propecia long-term side effects such as sexual dysfunction, insomnia and emotional symptoms persisted for years, even after they stopped taking Propecia.

The study Characteristics of Men Who Report Persistent Sexual Symptoms After Finasteride Use for Hair Loss, which was published in December 2016 in The Journal of Clinical Endocrinology & Metabolism, focused on three groups of men: finasteride users who reported persistent sexual problems after discontinuing finasteride; age-matched finasteride users who did not report sexual symptoms and healthy men who had never used finasteride.

Results of the study conducted at Boston's Brigham and Women's Hospital by a team of 19 clinical researchers showed that the former finasteride users group had impaired sexual function, higher depression scores, a more negative affectivity balance and more cognitive complaints than the men in the other two groups.
According to the study: "As sexual function worsened. . . there was increasing activity in the neural circuits corresponding to sexual arousal and decreasing activity in brain regions associated with higher level cognitive and motivational networks in symptomatic finasteride users in response to erotic stimuli. This dissociation in activity may be a marker of neural changes post-finasteride use."

The experiments suggest that there are "underlying neurobiological abnormalities in symptomatic finasteride users, which can be linked to circuitry that has been implicated in both depression and in sexual arousal," according to the study.

However, the study also called for larger prospective studies on former finasteride users: "It is possible that the depressive symptoms and prior finasteride use are coincidental or that the depressed mood may contribute to sexual dysfunction. It is unclear why only a subset of finasteride users experience persistent sexual symptoms and low mood."

As of Feb. 11, 2017, The World Health Organization Programme for International Drug Monitoring's database of adverse drug reactions (ADR) reported for finasteride contained 13,432 finasteride ADRs, including 2,678 erectile dysfunction, 1,667 sexual dysfunction. 1,300 depression, 51 major depression, 201 suicidal ideation and 41 completed suicides.

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