Q: Does finasteride need to be taken every day? — M.B., Atlanta, GA
A:Finasteride (Propecia) is a competitive inhibitor of Type II, 5 alpha-reductase (5AR is the enzyme that converts Testosterone to DHT which then causes hair to miniaturize and eventually be lost). Finasteride is 100x times more selective in inhibiting the Type II enzyme (present in hair follicles) than the Type I enzyme (present in other body tissues). The turnover (T1/2) of the finasteride/5AR Type II complex is 30 days and the finasteride/5AR Type I complex is 15 days. This explains why finasteride does not need to be taken every day and why, after stopping finasteride, the effects may take a month or longer to begin to disappear.
Q: Can Propecia (finasteride) completely halt androgenic alopecia for the duration of your lifetime, or does it just slow down the progression of androgenic alopecia? — L.B., Scarsdale, N.Y.
A: In many patients we have found finasteride to hold on to a patient’s hair for at least 15 years. We don’t have much longer data than that since it was approved for hair loss in 1998. Although finasteride will usually continue to work as long as you take it, it may lose some of its efficacy over time. Generally after about 5 years we may notice that the patient’s hair is starting to thin again and we will increase the dose slightly. It is important to understand that even if someone thins on finasteride it doesn’t mean the medicine is not working, because they might have thinned much more without it. To my knowledge, there are no studies that have looked at the effects of finasteride for such an extended period of time.
Q: I have been using an increased dosage of Propecia now for around 8 months and Rogaine for about 6 months. I know that shedding can be expected for the first 3-6 months, but I believe I am now beyond that timeframe. Have you seen cases in which these products merely exacerbate hair loss without the expected regrowth? — N.E., Travilah, Maryland
A: It is a bit long to still see shedding, but from my experience, either the medications are working (and you are still in the shedding phase) or you are not responding to them. I have not seen minoxidil or finasteride worsen hair loss. My advice would be to continue the same course for at least a year before re-evaluating their use.
The central finding of a 2004 study led by Italian researcher Dr. Antonella Tosti, in which he and his team investigated sexual dysfunction in hair loss patients being treated for androgenetic alopecia, was that there was no statistically significant change in sexual function after four to six months of treatment with finasteride 1mg (Propecia).
The researchers used a questionnaire, called the abridged 5-item version of the International Index of Erectile Function (IIEF-5), to measure sexual function in the men in the study. The questionnaire, which is considered an internationally valid diagnostic tool for distinguishing between men with and without erectile dysfunction, asks the patients 15 questions on the topics of: erectile function, orgasmic function, sexual desire, intercourse satisfaction, and overall sexual satisfaction. By administering the questionnaire both before and after treatment with finasteride, the researchers were able to determine if sexual function was impaired by the treatment.
The result of this investigation in the sexual function of 186 patients was that, “the erectile function of all patients remained stable after 4 to 6 months of treatment with finasteride 1 mg.”
Interestingly, the research team found that sexual side effects were actually less common than reported in the clinical trials of the drug. They suggest that this difference was potentially due to the fact that subjects in the clinical trials were made aware of the potential for sexual side effects, and were asked about these side effects upon each visit, which led to higher reporting of side effects than what would otherwise be the case.
Reference:
Tosti A, Pazzaglia M, Soli M, Rossi A, Rebora A, Atzori L, Barbareschi M, Benci M, Voudouris S, Vena GA. Evaluation of Sexual Function With an International Index of Erectile Function in Subjects Taking Finasteride for Androgenetic Alopecia. Arch Dermatol. 2004;140:857-858.
The 2011 study published by a research team led by Dr. Alfredo Rossi, is the first comprehensive investigation on long-term safety and efficacy of finasteride 1mg (Propecia).
In “Finasteride, 1 mg daily administration on male androgenetic alopecia in different age groups: 10-year follow-up,” the Italian research team sought to fill a gap in our understanding of the long-term effects of treating hair loss with Propecia. The study tracked hair growth in 118 men between the ages of 20 and 61, with mild to moderate hair loss, who were treated with 1mg finasteride. These patients were evaluated before treatment and then again at 1, 2, 5, and 10 years on treatment.
The result of testing found not only that Propecia works and is safe for use, but there were some other interesting findings as well. Only 14% patients experienced a worsening of hair loss, while 86% benefited from the treatment over this extended time period and efficacy of the drug was found not to reduce over time for the majority of patients.
One of the most interesting findings is that patients who had hair growth in their first year of treatment are more likely than others to have better hair growth after 5 years. About half of patients experienced good hair growth in their first year, and about 53% of those patients went on to see improved growth over time. However, of the group with unchanged or worse results in their first year, only 25% saw improved hair growth after 5 years. After 10 years, almost 69% of patients who experienced growth in their first year experienced continued growth. Only 32% of those who saw unchanged or worse results after their first year had growth at 10 years.
The authors concluded that a patient’s response to finasteride in the first year is a pretty good indicator of how effective long-term treatment will be for the patient. The better growth he experiences in his first year, the more likely he will have continued growth beyond 5 years of treatment.
Among other findings, the age of a patient did have a statistically significant effect on the outcome, as patients older than 30 years had better hair growth in the long term. On the topic of side effects, 7 subjects (5.9%) experienced them, and some of those patients remained in the study because of what they perceived as the benefits of the treatment.
In conclusion, the authors found that Propecia is a safe and effective hair loss medication, even when used long-term. It is effective in patients older than 40 years and it is particularly beneficial for patients over 30 and who are in early stages of hair loss. Perhaps the most important finding is that a patient’s response to finasteride after the first year of treatment can be an indicator of the patient’s success with the drug in the long-term.
Reference:
Rossi A, Cantisani C, Scarnò M, Trucchia A, Fortuna MC, Calvieri S. Finasteride, 1 mg daily administration on male androgenetic alopecia in different age groups: 10-year follow-up. Dermatol Ther 2011; Jul-Aug;24(4):455-61.
Led by Dr. A. Sato, a Japanese team of medical researchers published the largest finasteride study ever performed, “Evaluation of efficacy and safety of finasteride 1mg in 3,177 Japanese men with androgenetic alopecia.” It investigated the effects of finasteride over a 3 1/2 year period in men with androgenetic alopecia, or common baldness.
The study found that patients who had experienced hair loss for an extended period of time and were treated with finasteride exhibited notable hair growth. While a fairly small proportion of patients with a hair loss duration over 10 years exhibited “greatly increased” growth, 85% of patients with hair loss duration of more than 15 years experienced “moderate” or “slightly increased” growth. Physicians have thought that people with advanced hair loss do not respond as well as patients in the early stages of hair loss. However, in light of the results of this study, that determination should be reconsidered.
Further, the same study found that the initial age of a hair loss patient at the time of commencing treatment has little to no effect on the outcome. While the efficacy studies that are included in the Propecia package insert were conducted in men 18 to 41 years old, men over 41 appear to respond as well as the younger group. Adverse reactions occurred in only 0.7% of the study population and the Sato study found no increase in adverse safety events over time.
In summary, the Sato study showed an increased response rate to finasteride 1mg with increasing duration of treatment. In addition, it is effective in a larger portion of the male population with androgenetic alopecia than previously thought.
Reference:
Sato A, Takeda A. Evaluation of efficacy and safety of finasteride 1mg in 3,177 Japanese men with androgenetic alopecia. J Dermatol 2012; 39: 27–32.
Q: I am 26 and I have been diagnosed with Diffuse Unpatterned Alopecia (DUPA) and realize I am not a candidate for hair transplants. I have been on Propecia for about 9 months. There have been periods of increased shedding throughout and I am still shedding what seem to be mostly very fine, miniaturized hairs. Do you think this is the Propecia speeding up the hair cycle and pushing out the old fine hairs, or do you think this is an increase in the pace of my genetic balding? I know that your post states that the accelerated hair loss generally stops by the 6th month. Does DUPA have any effect on the timeframe? Also, I have read that Propecia is only effective for about 50% of patients with DUPA. Do you find that to be true, or have you found a different experience? — T.T., White Plains, N.Y.
A: It is hard to tell at 9 months whether it is shedding from the finasteride or that the medication is just not working. Since there is no way to tell, I would stay on the medication for 2 years for any possible shedding from the medication to have passed and to see if your hair loss actually stops.
Since the natural history of DUPA is so unpredictable, I would give it the full two years rather than the 1-year trial the company recommends. There is no real scientific data to support this recommendation, however.
Please take heart in the fact that people with DUPA often look great (even without any hair transplants) if they keep their hair very short, since they never develop that cosmetically unappealing wreath of hair around the back and sides that is normally associated with extensive balding.
Q: I believe I am an “early” IIIA or IVA. I am not losing any hair on the back of the scalp. There is no substantial hereditary hair loss on either side of the family, but I began taking Propecia four months ago and recently noticed a dramatic thinning of hair on the top (front) of the scalp, extending back to the rear of the head. — B.M., Lower East Side, N.Y.
A: Often people experience some shedding the first six months on finasteride as the new hair essentially pushes out some of the old. I would wait a full year before making any judgments about a hair transplant since you may see significant regrowth from finasteride in the second six months and may not need surgery at this point, particularly if the hair loss is early.
Q: I am a 22 yr. old male and have been on Propecia for exactly 4 months. When I started taking the medication, I was in the beginning stages of hair thinning/loss in the front and crown areas, with no change in my hair line. During the time I have taken Propecia, my hair loss has increased drastically. Is it that I just have to bite the bullet and am one of the few unlucky individuals that do not respond to Propecia? Could it be that I am taking the medication incorrectly? Wrong time of day? With or without food? Or, do I just need to give it more time? Is there still a chance I could at least regain the hair I’ve lost over these past 4 months? — A.B., St. Louis, Missouri
A: You are probably experiencing an accelerated phase of hair loss that is possibly made worse by the finasteride. The shedding from finasteride is common during the first few months of treatment and is temporary. The full effects of Propecia are not seen for 6 to 12 months.
I would continue to take the medication for at least a year before you judge if it is working. It does not matter the time of day or relationship to food.
Q: I am 28 years old and was told that I have early Norwood Class 3 hair loss. I want to have a hair transplant but my doctor told me to use Propecia for 6 months and then come back to discuss surgery. I don’t want to wait that long, what should I do? — L.B., Oyster Bay Cove, NY
A: Actually, you should wait a full year. If you are an Early Norwood Class 3, the Propecia can work so well (in actually growing hair back) that you may not even need a hair transplant. The important point is that Propecia only starts working at 3-6 months and during this time there may actually be some shedding as the new growing hair literally pushes out the old.
A hair transplant performed at 6 months may not only be unnecessary, but growth from the medication may be attributed to the hair restoration surgery. I suggest to wait and see what the medication can do before going for hair restoration surgery.
Q: I have heard that you should take Propecia for 6 to 12 months following a hair transplant. Is this correct? — P.E., Dallas, TX
A: I would only use Propecia if you plan to continue the medication long-term. That said, Propecia — the brand name of the hair loss drug finasteride — is very helpful in preventing further hair loss. I do recommend that patients who have hair loss stay on the medicine for an extended period, regardless of whether or not they decide to have a hair transplant procedure.
Q: I was wondering why you chose two years as the amount of time one should wait to judge the effectiveness of Propecia. Have you had patients who only saw results after that long? Why does Merck say 3-6 months and Dr. Rassman at New Hair say 6-8 months? I know these numbers aren’t arbitrary, but I’m just wondering what the logic is behind this and how does this relate to planning a hair transplant? — I.P., Hempstead, Long Island, NY
A: The Merck data showed that over 90% of patients had peak response at 1 year and this has been my experience as well.
Most patients show the most dramatic response between 6 to 12 months with some getting additional benefit up to two years. Prior to 6 months, the results are quite variable and there may even be a net loss due to shedding during this period, as the Propecia (finasteride) stimulates a new anagen cycle.
If one is planning to go on Propecia before a hair transplant to minimize any shedding from the surgery and to prevent future hair loss, one should start the medication at least one month prior to the procedure.
If one wants to use Propecia for the purpose of possibly avoiding hair restoration surgery, then one needs to wait at least a year to see if there will be enough regrowth.
Finally, if one is younger (i.e. in the 23-25 age range) one should be on Propecia for at least two years to give it every possible chance of working and see its maximum benefit before considering a hair transplant.
