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Why Do Antiperspirants Fail? Zoe Diana Draelos, MD

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Why Do Antiperspirants Fail? Zoe Diana Draelos, MD COSMETIC CCONSULTATIONONSULTATION Why Do Antiperspirants Fail? Zoe Diana Draelos, MD nwanted axillary perspiration remains a com- fatty acids, lactic acid, citric acid, ascorbic acid, urea, and mon dermatologic problem. Clearly, the biggest uric acid. Apocrine sweat is a turbid, viscous, odorless fluid U advance in the treatment of this condition is of pH 6 to 7.5 that has a high content of water in addition the injection of botulinum toxin, which produces dra- to protein, carbohydrate waste materials, and sodium chlo- matic long-term sweat reduction. Yet, antiperspirants ride. The amount of eccrine perspiration is much greater remain a viable effective alternative in some patients. than the amount of apocrine perspiration. An effective Antiperspirants can even be combined with botulinum antiperspirant must reduce both types of perspiration. toxin to prolong or increase the effect of long-term sweat reduction. Optimizing the effect of traditional antiperspi- How Does an Antiperspirant Reduce Sweat? rants involves understanding how they function and then The reduction of apocrine and eccrine perspiration on identifying why they fail. This article examines the realm the body is a daunting task. In the axilla, there are some of the antiperspirant from the practical aspect of optimal 25,000 eccrine glands capable of producing large quanti- hyperhidrosis treatment. ties of perspiration in response to heat and emotional COS DERMstimuli. Antiperspirants work by coagulating the protein What Is an Antiperspirant? in the sweat duct. Antiperspirants contain metal salts that Antiperspirants are classified by the US Food and Drug combine with intraductal keratin fibrils to cause eccrine Administration (FDA) as over-the-counter (OTC) drugs duct closure and formation of a horny plug to obstruct and must follow certain safety guidelines. The most sweat flow to the skin surface.1 important guideline is that the active ingredient must be The only 2 metal salts that are presently used in anti- selected from an approved list and used in concentrations perspirants are aluminum and zirconium.2 The original no greaterDo than specified. The guidelinesNot for antiperspi- antiperspirant Copy formulation was a 25% solution of alumi- rant formulation are listed in a monograph published by num chloride hexahydrate in distilled water, but it was the FDA. The first antiperspirant appeared on the market extremely irritating.3 More modern antiperspirant formu- in the United States in 1919. lations contain aluminum chloride, aluminum chlorohy- Antiperspirants are intended to reduce the amount of drate, aluminum-zirconium chlorohydrate, and buffered sweat that is released by the eccrine sweat glands and aluminum sulfate.4 These metals provide a better balance ducts onto the skin’s surface. They are distinct from between efficacy and skin irritation. deodorants, which are intended simply to make the skin smell better. Most antiperspirants function as deodorants How Are Antiperspirants Evaluated? by decreasing the substrate available for bacterial growth; The FDA has established that an antiperspirant must however, deodorants do not function as antiperspirants. reduce sweat by at least 20% to be marketed in the United States as an effective product. Antiperspirants that What Is Sweat? are labeled as highly effective must reduce sweat by at Sweat can be divided into apocrine and eccrine perspira- least 30%. For most dermatologic patients, this amount tion. Eccrine sweat is a clear, odorless fluid of pH 4 to 6.8, of sweat reduction would be considered woefully inad- composed of 98% to 99% water, sodium chloride, lower equate. This is the main reason that not all antiperspirants provide sweat reduction in individuals with abundant Dr. Draelos is Consultant and Researcher for the Skin Care perspiration. The ingredients in antiperspirants were Industry and Primary Investigator, Dermatology Consulting designed to perform at a reduction level of 20% to 30%. Services, High Point, North Carolina. Efficacy is defined as the percentage of reduction in the The author reports no conflict of interest in relation to rate of sweating achieved after application of the antiper- this article. spirant product. The percentage of sweat reduction can VOL. 20 NO. 8 • AUGUST 2007 • Cosmetic Dermatology® 481 Copyright Cosmetic Dermatology 2010. No part of this publication may be reproduced, stored, or transmitted without the prior written permission of the Publisher. COSMETIC CONSULTATION be determined gravimetrically.5 This involves weighing For this reason, the armpit should be dry when the prod- an absorbent pad and then placing the pad in the armpit uct is applied. Many dermatologists recommend that while the subject is induced to sweat in a hot room. The patients apply an OTC or prescription antiperspirant and pad is then reweighed after a specified time in the hot then occlude the armpit with plastic wrap. If the patient room, and the increase in weight per time is converted sweats profusely under the occlusion, the perspiration into a sweating rate. The rate can be compared before and may wash away the active ingredients before a plug can after the application of an antiperspirant. be formed. Thus, the occlusion may decrease the efficacy of the antiperspirant rather than increase efficacy due to How Can Antiperspirants Work Better? enhanced penetration. An effective antiperspirant must quickly create a long- Antiperspirant failure may also be caused by incon- lasting plug in the sweat duct ostia. This is best accom- sistent application. Compliance is important to achieve plished by evenly spreading the antiperspirant in the optimal results. It takes approximately 10 days of axillary vault. If the antiperspirant does not touch the antiperspirant application for the complete plug to be sweat duct, it will not work. This is similar to the way that formed in the sweat duct. If the patient decides after botulinum toxin will only work for sweat reduction if it is 3 days of application that the antiperspirant has not injected over the entire area of moisture production. The worked sufficiently, the product has not been given ability to evenly distribute the antiperspirant accounts for an adequate trial. Furthermore, the plug is completely the decreased efficacy of aerosol spray formulations, which gone 14 days after the last application. Continuous daily may easily miss areas containing sweat glands. application is necessary to achieve and maintain the The most effective antiperspirants are the sticks and sweat-reduction effect. lotions. These are vigorously rubbed into the axilla Also to be considered is the depth of the plug within to remove the product from the specially designed the sweat duct. Plugs that are more deeply placed in the applicator COSand distribute the chemical throughout theDERM sweat gland will provide better sweat reduction than armpit. The active agent in the newer antiperspirants is those that are superficially situated. If the plug is very aluminum-zirconium tetrachlorohydrex-gly complex. close to the surface, it is possible that it can be removed This complex can reduce axillary perspiration by 40% to by the rubbing of clothing or shaving. Patients who 60%. These aluminum salts have an acidic pH of 3 to 4.2.6 complain that antiperspirants do not work may wish Irritation is reduced by incorporating skin-conditioning to wear loose-fitting clothing around the armpits and agents, such as dimethicone or cyclomethicone, into the use only light razor pressure when shaving the armpits. formulation.Do The silicone imparts Not soothing properties to The deepestCopy plugs are created by prescription alumi- the skin irritated by the antiperspirant ingredients. num chloride solutions, but these formulations must be used carefully, as they can irritate skin and ruin natural Why Do Antiperspirants Fail? fabrics, such as rayon, cotton, and silk. More superficial Understanding why antiperspirants fail is indeed com- plugs are created by OTC antiperspirants containing plex. Some of the reasons have been previously dis- aluminum chlorohydrate. Intermediate-depth plugs are cussed. The most likely reason for antiperspirant failure created by OTC antiperspirants containing aluminum- is that the formulation does not contain an optimal active zirconium chlorohydrate. ingredient mix and appropriate vehicle construction to deliver the best results. For this reason, patients with What Can Be Done to Optimize Topical sweating problems should not select unbranded antiper- Antiperspirant Efficacy? spirants sold at a lower price point. Better antiperspirant Optimizing antiperspirant efficacy requires the use of a formulations contain costlier ingredients and will not be well-formulated product that is consistently applied to the cheapest on the shelf. the entire armpit as a thin film. Efficacy can be further Another common reason for antiperspirant failure is enhanced by applying the antiperspirant twice daily, in the lack of an even film that covers the entire armpit. The the morning and at bedtime. The bedtime application is antiperspirant must be in contact with each and every actually more important than the morning application eccrine and apocrine duct in the armpit to work. Thus, because the body is at rest and sweating reduced. The the applicator should be domed to fit into the axilla and reduced sweating decreases the removal of the antiper- dispense a thick, even film of the product. The film must spirant from the armpit and allows the active ingredient be somewhat water resistant
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