
The internet is all a buzz this morning about the latest “study” released about the long term side effects of Finasteride, aka Propecia. The study was published online by the International Society for Sexual Medicine in March 2011, by primary investigator, George Washington University Andrology/Endocrinology Professor, Dr. Michael Irwig. His study consisted of interviewing 71 otherwise healthy men aged 21–46 years who reported the new onset of sexual side effects associated with the use of finasteride, in which the symptoms persisted for at least 3 months despite the discontinuation of finasteride.
The current controversy centers around his findings not being consistent with the clinical experience of practicing physicians and previous published data. Over the past decades numerous medical studies have demonstrated the general safety and success rate of this medication. In one German clinical trial involving more than 1,500 men, a significant increase in hair density was seen in 48% of patients at one (1) year, and 66% of patients at two (2) years had greater hair density. In this study and others like it, less than two(2) percent of patients experienced sexual side effects. The only established relationship between Finasteride and sexual dysfunction is a reduction in ejaculatory volume.
While Irwig’s findings are surprising, problems are observed in the details of his study design and his intended goals to characterize the types and duration of persistent side effects of Finasteride users. To begin, he uses the Arizona Sexual Experience (ASEX) scale, a simple screening five question rating scale of sexual satisfaction having its own limitations and controversy. The ASEX scale was originally and primarily developed as a less intrusive method for evaluating pyschotropic drug-induced sexual dysfunction in depressed patients by mental health experts and psychiatrists. The ASEX scale was not meant to be used in the non-pyschiatric setting or to evaluate the long term side effects of non psychiatric medications.
Other inherent limitations of sexual dysfunction studies using the ASEX scale include personal bias or religious views influencing the interpretation of results; as well as the definitions of sexual dysfunction, sexual activity, and perceived sexual dysfunction are being subjectively evaluated. Also, the description of the ASEX scale in original published medical literature “does not establish the etiology of a patient’s sexual dysfunction.”
Another aspect drawing criticism of Irwig’s study are patients selected for the study were not randomized or compared to control groups. The subjects were selected from an anti-Propecia web site (www.propeciahelp.com) and consisted of a subgroup of men “who were victims of Propecia side effects.”
Irwig personally interviewed 71 men between the ages of 21 and 46 who self-reported long term sexual side effects associated with Finasteride use. According to his published study he found:

92% of participants reported developing erectile dysfunction
94% of participants reported experiencing low sexual desire
92% of participants reported a decline in sexual arousal
69% claimed trouble achieving an orgasm
But what do the previous decades of published data give us? Well, numerous published studies have demonstrated the general safety and success rate of this medication. In one German clinical trial involving more than 1,500 men, a significant increase in hair density was seen in 48% of patients at one (1) year, and 66% of patients at two (2) years had greater hair density. In this study and others like it, less than two(2) percent of patients experienced sexual side effects.
According to Orange County hair restoration surgeon, Dr. Ken Williams, “I have problems with Irwig’s study and methodology. The selection of his patients from an already skewed patient population will not give good scientific based results. I am surprised he did not have 100 % of his study subjects experiencing sexual dysfunction considering these men were recruited from a biased web site for men with alleged existing sexual side effects from Finasteride.”
Williams adds, “the debate on the effects of DHT inhibitors on a male’s sexuality is well documented in medical literature.” “Finasteride inhibits the conversion of testosterone to DHT, a known inhibitor of hair growth, and decreases DHT by 70% according to most research studies. It is generally safe to take.”
After completing the study Irwig told AOL Health, “It’s obviously having some effect on the brain, it’s messing up different hormonal pathways. Some of these pathways are important for things like libido and sexual function.” To his credit though, Dr. Irwig stated his study did have limitations including selection and investigator bias, lack of serum testosterone and other hormone levels, and “post-hoc approach.” A “post-hoc approach” defined as a randomized, doubled-blind,placebo-controlled or scientific validated results can’t be drawn from this study.
Most hair restoration specialist/doctors/surgeons, remain confident Finasteride will still be available for use because of several previous studies reflecting its general safety and efficacy. Nonetheless, the concern for men who suffer from long term sexual side effects from Finasteride, also referred to by the lay public as “Post Finasteride Syndrome,” will be unknown until further better designed and less biased studies are available.”
So what did we learn from this study? Are Irwig’s results consistent with the existing clinical experiences of prescribing physicians? In a few short words, many hair restoration physician and surgeons don’t feel Irwig’s conclusions are consistent with their clinical experience and the bottom line that there is no cause-effect relationship established by Irwig’s published study. More studies are needed to understand the etiology and pathology of patients experiencing long term sexual dysfunction.
So what is your opinion?
Go bald and still be able to have satisfying sexual experiences, or keep your hair and maybe experience some sexual dysfunction?

I think I can guess Jason Statham’s answer……