Alopecia affects a significant number of Americans. One study of men between the ages of 18 to 49, found that 42% of the men had moderate to extensive hair loss.' Hair loss is less prevalent in women and has a reported incidence of between 29 to 38% in women over 70 years of age.2 There are a variety of different pathologies that can contribute to hair loss including noncicatricial alopecias such as androgenic alopecia, alopecia areata, and telogen effluvium as well as cicatricial alopecias such as lichen planopilaris. Androgenetic alopecia is the most prevalent form of hair loss in both men and women.3
In this newsletter, we will focus on noncicatricial alopecias and review topical treatments and their evidence for efficacy for various types of hair loss.The most common variety of hair loss, androgenetic alopecia, has been well studied. It can be precipitated by acute stressors, weight loss, drugs (including contraceptives that contain androgenic progestins), and of course, has a strong genetic component.4 It is called androgenetic alopecia in reference to its mechanism of action, which is dihydrotestosterone (DHT) causing hair follicle miniaturization. This type of alopecia grows more common with advancing age.
Conversely, alopecia areata often onsets before the age of 30, and hair loss is caused by autoimmune destruction of hair follicles. Alopecia areata often looks distinct from androgenetic alopecia, rather than causing thinning and hairline recession, alopecia areata tends to cause round areas of total hair loss and oddly shaped hairs called exclamation point hairs.
Other types of noncicatricial alopecia include telogen and anagen effluvium. Telogen effluvium is diffuse hair loss and can usually be attributed to a stressor event, generally occurring several months before the hair loss is seen. This hair loss is the result of 20-50% of scalp hair transitioning to the telogen phase prematurely.
Anagen effluvium is also characterized by diffuse hair loss but is also associated with hair breakage during the anagen phase, and generally occurs within 1 to 4 weeks of a precipitating event such as radiation therapy or chemotherapy.5 In this article, we will be focusing on topical treatments for the two most common types of alopecia; alopecia areata, and androgenetic alopecia.
Topical minoxidil has been well studied in both men and women at both 2% and 5%. Studies have demonstrated the superior efficacy of 5% minoxidil over 2% minoxidil twice daily.
One study reported 45% more hair growth at week 48 of the study in the 5% minoxidil group. However, this increase in efficacy was tempered with increased adverse effects including pruritis and local irritation.4,6 Finasteride is another commonly used agent for androgenic alopecia.
Though the use of oral finasteride for alopecia is well documented, limited information exists on topical finasteride. Finasteride at concentrations of 0.005% have been tested in men and women and statistically, a significant benefit was observed after 6 months of use.1 Another 6-month long study in men tested a 1% finasteride gel formulation vs finasteride oral tablets and found efficacy with the topical gel.10
A more recent study of androgenic alopecia in men tested 0.25% finasteride in combination with 3% minoxidil vs 3% minoxidil alone over the course of 24 weeks and concluded that the combination therapy was significantly superior to minoxidil alone.9,10 Tretinoin is another topical option sometimes used. One study of once-daily tretinoin 0.01% with minoxidil 5% vs twice-daily minoxidil 5% found that the once-daily combination therapy was as effective as the twice-daily minoxidil treatment.12
Ketoconazole may also play a role in the treatment of androgenic alopecia. Limited studies in humans of ketoconazole 2% lotion or shampoo have shown benefit for some patients, and other studies in mice have noted hair regrowth as well, though the improvement was not as significant as minoxidil compared to the placebo group.13,14,15,16Spironolactone is another agent sometimes used topically for hair loss.
Very little information exists concerning the use of this ingredient.
One study of 60 female patients found a spironolactone 1% topical to be effective at promoting hair growth, however, the study has not been repeated and the benefit has not been studied in men.17,18 Estradiol is another topical option with some limited data in female alopecia. One 6-month long study evaluating estradiol 0.025% topical lotion in patients with androgenetic alopecia found a decrease in hair loss, however, regrowth of new hairs was not demonstrated.
A possible mechanism is an estrogen induced increase in glycoprotein sex hormone-binding globulin leading to decreased free testosterone.19 Yet another mechanism that may play a role in hair loss is prostaglandin-mediated anagen induction. Latanoprost and bimatoprost are both prostaglandin analogues generally used for glaucoma, however, recent evidence has emerged suggesting that in addition to their effect on increased eyelash growth, they may also be able to promote increased hair growth. One study in patients suffering from androgenetic alopecia found increased hair density observed with latanoprost 0.1% solution at 24 weeks as compared to placebo.20
Lastly, though the mechanism of action is at this point unclear, topical melatonin has also been associated with an increase in anagen hair in women with both diffuse and androgenetic alopecia. Melatonin 0.1% solution was applied to the scalps of these women for 6 months resulting in increased hair growth as compared to the placebo group.21,22
Some common treatments for alopecia areata include agents used to cause contact dermatitis including squaric acid and diphencyclopropenone. One study looking at diphencyclopropenone sensitized patients with a 2% solution before decreasing to a much lower concentration, usually 0.001%, after two weeks and then gradually increased dosing weekly thereafter up to the tolerated dose. The study had a response rate of 77% in patients with alopecia areata, and even saw some benefit in patients suffering from alopecia totalis and universalis.37,35 Squaric acid has a similar treatment protocol.
One study started at 2% for an initial sensitization treatment before decreasing to 0.001% after one to two weeks. Then, much like with diphencyclopropenone, the dose was increased on a weekly basis until the patient had a reaction generally landing in the 0.01-1% range. The study found "excellent response" in 60% of treated sites.37 Other common active ingredients for the management of alopecia areata include steroids. One study of 28 patients with alopecia areata who applied 2.5g of 0.05% clobetasol propionate ointment for 6 months to one side of scalp resulted in some regrowth for 28.5% of patients.26
Studies of other potent steroids including betamethasone and fluocinolone acetonide also found benefit in patients suffering from alopecia areata.There exists a myriad of treatments for alopecia, many more than have been documented above, if you would like to read more about other active ingredients and their possible roles in the management of various types of alopecia, head to the Fagron Academy website to see a table of actives, mechanism of action, concentrations, and study results.
The topics and descriptions discussed within this document are general in nature. These general discussions are not intended and should not be interpreted to make recommendations or claims regarding the use, efficacy or safety of products, formulas or vehicles. Only a physician or other appropriately licensed professional, as a learned intermediary, can determine if a formula, product or service is appropriate.
The matters discussed herein are for informational purposes only and not intended for the purpose of providing legal advice. You should consult your attorney in case of any questions as to when it is appropriate to compound or regarding any other particular issue discussed or referenced in this document.
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