Underarm Botox for Excessive Sweating: How It Works and How Long It Lasts

Underarm Botox treats excessive sweating by blocking the nerve signals that activate the sweat glands in the armpits. A doctor places many small, shallow injections across the underarm skin, and sweating usually decreases noticeably within a few days to two weeks. Results commonly last around four to six months, and in some people closer to a year. It is a well-established treatment for primary axillary hyperhidrosis, approved for this use in many countries, and it is generally considered safe and effective when performed by a trained professional.

This guide explains how the treatment works, who it suits, what to expect and how to make results last.

Understanding Excessive Underarm Sweating

Sweating is normal and helps regulate body temperature. Hyperhidrosis means sweating more than the body needs, often enough to soak clothing, interfere with work or social life, or cause anxiety. There are two main types:

• Primary focal hyperhidrosis: excessive sweating in specific areas such as the underarms, palms, soles or face, without an underlying medical cause. It often starts in adolescence or early adulthood and may run in families.
• Secondary hyperhidrosis: sweating caused by another condition or medication, such as thyroid problems, infections, menopause or certain drugs. This often affects the whole body.

If sweating is new, generalised, occurs during sleep or comes with weight loss or fever, see a doctor to look for an underlying cause before cosmetic treatment.

How Underarm Botox Works

Sweat glands are activated by nerves that release a chemical messenger called acetylcholine. Botulinum toxin temporarily blocks this release in the treated area. As a result:

1. The sweat glands in the treated skin receive fewer signals.
2. Sweat production in the underarms drops significantly.
3. Over months, the nerve connections recover and sweating gradually returns.

Botox does not remove sweat glands, and the body continues to sweat normally elsewhere to regulate temperature.

Who Is a Good Candidate?

Underarm Botox may suit people who:

• Have primary axillary hyperhidrosis that affects daily life.
• Have tried clinical-strength antiperspirants without enough improvement.
• Want a non-surgical option with little downtime.
• Want temporary relief for a specific period, such as summer, a wedding or travel to a hot climate.

It is generally not recommended during pregnancy or breastfeeding, for people with certain neuromuscular conditions, or where there is infection in the underarm area. Share your full medical history and medications with your doctor.

What Happens During Treatment

Before the procedure

Some doctors perform a starch-iodine test, which turns the sweating area dark, to map exactly where to inject. You may be asked to shave beforehand and avoid deodorant on the day.

The injections

Numbing cream or ice may be used. The doctor then places numerous tiny injections in a grid pattern across the sweaty area of each armpit. The procedure typically takes around 15 to 30 minutes.

Dose

Commonly cited amounts for both underarms together are often in the range of several dozen units, typically spread evenly across each side, but the exact amount is decided by the doctor based on the size of the area, the product used and the severity of sweating.

When Results Appear and How Long They Last

• Two to four days: many people begin to notice less sweating.
• One to two weeks: full effect is usually reached.
• Four to six months: a common duration for results, though some people enjoy relief for longer, sometimes up to around a year.
• Gradual return: sweating slowly comes back as the effect wears off, rather than suddenly.

Duration varies with the individual, the product, the dose and how severe the sweating was to begin with. Many people repeat treatment once or twice a year.

Side Effects and Aftercare

Underarm Botox is generally well tolerated. Possible side effects include:

• Mild pain, redness or small bumps at injection sites.
• Minor bruising.
• Temporary itching or tenderness.
• Some people notice slightly more sweating in other areas, often called compensatory sweating, though this is less common than after surgical treatments.

Common aftercare advice includes:

• Avoiding intense exercise, saunas and hot baths for about a day.
• Not rubbing or massaging the underarms on the treatment day.
• Waiting until the next day to use deodorant, if your doctor advises.

For travelers, there is very little downtime, so the treatment is easy to fit into a short trip to Korea. Flying soon afterwards is generally fine.

Other Treatment Options

If Botox is not suitable or you want longer-term solutions, alternatives include:

• Prescription-strength antiperspirants: often the first step.
• Topical or oral medications: prescribed by a doctor for some people; these have their own side effects and are not suitable for everyone.
• Microwave-based devices: designed to reduce sweat glands with more lasting results, usually after one or more sessions.
• Surgical options: such as removal of sweat glands, or sympathectomy in severe cases, which carries significant risks including compensatory sweating.

Frequently asked questions

Is underarm Botox painful?

The many small injections can sting, but most people find it tolerable, especially with numbing cream or ice.

Will stopping sweat in the armpits be harmful?

No. The underarms are a small part of the body's sweating area, so body temperature regulation is not significantly affected.

Does it reduce body odour?

Less sweat often means less odour, as bacteria have less moisture to break down, although results vary.

Can Botox be used for sweaty palms too?

Yes, it can be used for palms and soles, though those areas tend to be more painful to treat and may carry a risk of temporary hand weakness.

Find Relief With Professional Guidance

Underarm Botox is an effective, well-studied way to reduce excessive sweating for several months at a time. It can greatly improve comfort and confidence. A qualified dermatologist can confirm the type of sweating you have, rule out underlying causes and advise whether Botox or another option is best for you.