Q: Are there DHT blockers that are sold in the pharmacy over the counter?
A: The only effective DHT blockers are finasteride (Propecia, Proscar) and dutasteride (Avodart).
These medications require a doctor’s prescription and are not sold OTC. Nizoral is a topical shampoo for seborrhea (a type of dandruff) that is sold over the counter, but it is not effective in treating hair loss.
Q: I heard that there is a new drug on the market called Avodart for prostate enlargement which might help with hair loss as it blocks the conversion of testosterone to DHT better than Finasteride and is more effective than Propecia. Do you recommend taking it and if so what is the dose?
A: I am currently not recommending that patients take Dutasteride for hair loss, although it is more effective than Propecia, finasteride 1mg. (Dutasteride 0.5, the dose generally used for hair loss, seems to be slightly more effective than finasteride 5m in reversing miniaturization.)
The reasons that I am hesitant to prescribe it at present are outlined in the Hair Transplant Blog question Is Avodart Safe?
In addition to the reasons that I listed in that response, I would also consider that: Dutasteride, unlike finasteride, decreases sperm counts, it can result in persistent decreased sex drive and the incidence is greater than with finasteride. Finally there are a significant number of alpha-type 1 receptors in brain, those affected by dutasteride, but not finasteride.
However, since Dutasteride is approved for older men with prostatic disease, using it for hair loss in this age group (usually in a lower dose) is reasonable.
Q: I’m male, early thirties and in the early stages of hair loss, too early for hair transplants. I am experiencing extreme shedding. I took Avodart for 6 weeks, but because of the shedding I stopped. Now, it still continues as strong as ever. I’ve been losing about 200 hairs every day in the shower. 3 months ago I had so much more hair, what is going on? I heard that shedding can happen, but not like this. Could this have caused telogen effluvium, or something else?
A: Since Avodart (dutasteride) is a more potent medication than Propecia (finasteride), the shedding (telogen effluvium) may be more dramatic. If you have made a decision to use Avodart, then you need to tolerate this short-term effect. It should subside within the first 6 months on the drug.
Q: I’m 52 years old and have been taking Propecia (finasteride) for two years. It seems to maintain the status quo with no apparent regrowth. I am considering adding a dose of Avodart (dutasteride) once a week in conjunction with the daily Propecia. My question is twofold: (1) Since dutasteride blocks production of both enzymes (type I and II) that produce DHT from testosterone, is it redundant to take the finasteride that only blocks the type I enzyme?
A: It is redundant to take both.
However, you may not be taking the optimal dose of dutasteride which seems to be at least 0.5mg a day for hair loss.
Q: If I use the dutasteride for one year and do not see a noticeable improvement can I quit the Avodart, continue the daily dose of Propecia and expect to retain the same “holding pattern” I have now?
A: If Avodart is helping to maintain the status quo then you can expect to lose some hair, i.e. return to where you would have been if you had used finasteride alone.
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Disclaimer: The purpose of the Hair Transplant Blog is to provide the public with general information on hair restoration. Information provided on this site should not be used for medical diagnosis and/or treatment.
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