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For localized hyperhidrosis problems, the first treatment of choice is strong (or clinical strength) antiperspirants. Basic antiperspirant products are almost always ineffective in reducing excessive sweating. Stronger clinical strength products can prove to me more effective, especially in the armpit region. Note that deodorants are products that help control body odor and are not the same as antiperspirants. Some clinical strength antiperspirants also include deodorants in them.
There are dozens of well known clinical strength antiperspirant products out there, and some require a prescription (due to high aluminum content and an alcohol rather than water base). Although the few products that I have tried using to relieve my excessive feet sweating proved to be ineffective, I have seen good results on my armpit sweating. Some people have success on their hands and/or feet too, but generally, iontophoresis has a much higher rate of success in those areas. The hands and feet contain a majority of the body's sweat glands and also have very thick skin, making antiperspirant absorption difficult. Nevertheless, antiperspirants are so much cheaper than other treatments, that it makes sense to always try them as a first treatment of choice.
Note that I did not try applying antiperspirants on my feet in the most effective way per some people -- i.e., before going to bed at night, wash your feet (or palms), apply antiperspirant, cover feet (or palms) in saran wrap, go to sleep, and repeat the process the next night. Besides not wanting to participate in such a tedious process every day, my feet don't sweat at night when I am asleep and my hyperactive nervous system is relaxed.
The vast majority of antiperspirants contain some kind of aluminum based compound as being the main active ingredient. Historically, aluminum chloride and aluminum chlorohydrate were the active ingredients of choice. However, both these products can cause irritation to the skin, so aluminum zirconium tetrachlorohydrex glycine has recently become a more popular option. The US FDA allows over-the-counter antiperspirants to consist of between 15 and 25 percent aluminum (with the figure varying based on the specific compound being used).
Pros: Very cheap at around $5 for 35 ml; Many favorable reviews on Amazon.
Cons: Potential itching and irritation due to the use of aluminum chloride; 15 percent aluminum chloride = not very strong.
Pros: 20 percent aluminum chloride = quite strong; The company adds no water to the product; Micro dosed pump avoids over-application of product and enables product to last for a long time; Many favorable reviews on Amazon (UK site) and on the company's own website; 40 years of market presence and product innovation.
Cons: Potential itching and irritation due to the use of aluminum chloride; Moderately expensive at $18 for a 30 ml spray.
Pros: Reasonably priced at around $20 for 37.5 ml; 20 percent aluminum chloride hexahydrate = quite strong.
Cons: Potential itching and irritation due to the use of aluminum chloride; No reviews on Amazon.
Pros: Reasonably priced at $14 for 30 ml; Includes antiperspirant as well as deodorant; Many reviews on Amazon.
Cons: 15 percent aluminum chloride = not very strong; Potential itching and irritation due to the use of aluminum chloride.
Pros: Very cheap at around $10 for 60 ml; 20 percent aluminum chloride hexahydrate = quite strong; Reasonable number of favorable reviews on Amazon (UK site).
Cons: Potential itching and irritation due to the use of aluminum chloride.
Pros: Most favorable reviews on Amazon
Cons: Potential itching and irritation due to the use of aluminum chloride.
See my experiences with Dehydral for more.
No official website for product, and hard to find elsewhere it seems.