botox
Botox for Excessive Sweating: What to Expect
Last reviewed: May 2026 · Haute MD Editorial Team
Botox (onabotulinumtoxinA) is FDA-approved for primary axillary hyperhidrosis — excessive underarm sweating that is not adequately controlled by topical antiperspirants. It works by blocking acetylcholine-mediated signals to the sweat glands (eccrine glands) rather than to muscles — preventing sweat secretion in the treated area. A single treatment reduces underarm sweating by 82-87% in clinical trials, with results lasting 4-7 months — significantly longer than cosmetic Botox results. It is also used off-label for excessive palmar (palm), plantar (sole), and craniofacial sweating.
How the procedure works
The underarm treatment area is mapped using a starch-iodine test that visualizes active sweat glands — areas that stain purple when iodine meets starch dissolved by sweat. This map guides injection placement — typically 10-15 injection sites per axilla using a fine needle, spacing approximately 1-2cm apart across the sweat-active area. Topical numbing cream significantly reduces discomfort. Total treatment time is approximately 15-20 minutes for both axillae. Results onset within 2-4 days and persist 4-7 months — considerably longer than the 3-4 months typical for cosmetic Botox because sweat glands have different physiology than facial muscles.
Off-label applications — palms, scalp, face
Palmar hyperhidrosis (excessive palm sweating) — very effectively treated with Botox but significantly more painful than axillary treatment due to higher nerve density in the palms. Nerve blocks (median and ulnar) are typically offered. Results last 3-6 months. Plantar hyperhidrosis (sole sweating) — similarly effective but also painful; nerve blocks usually required. Craniofacial hyperhidrosis (forehead, scalp sweating) — effectively treated; the forehead must be injected carefully to avoid brow ptosis from toxin migration. Frey's syndrome (sweating while eating) — very effectively treated with Botox to the parotid region.
Cost and insurance coverage
Botox for axillary hyperhidrosis is covered by most major insurance plans when documented clinical criteria are met — typically requiring documentation of inadequate response to prescription-strength aluminum chloride antiperspirant (Drysol) and significant functional impairment. Prior authorization is required. Out-of-pocket cost without insurance is approximately $1,000-$1,500 per treatment session for both axillae. Allergan's Botox patient assistance program is available for eligible patients. Palmar and plantar treatments are less consistently covered — check with your insurer.
Frequently Asked Questions
How much Botox is needed for sweating?
The standard dose for axillary hyperhidrosis is 50 units per axilla (100 units total) — significantly higher than typical cosmetic facial doses. Palmar treatment uses 100 units per hand. Dosing may be adjusted based on sweat zone area and clinical response.
Is Botox for sweating covered by insurance?
Yes, for axillary hyperhidrosis in most major insurance plans, with prior authorization and documentation of failed topical treatment. The treating dermatologist manages authorization. Coverage for palmar, plantar, and craniofacial sweating is less consistent — verify with your specific insurer.
Does Botox for sweating hurt?
Axillary treatment is well tolerated with topical numbing cream — mild discomfort. Palmar treatment without nerve blocks is quite painful due to high nerve density in the palms — nerve blocks are strongly recommended and make the procedure comfortable. Plantar treatment similarly benefits from nerve blocks.
How long does Botox last for sweating?
4-7 months for axillary hyperhidrosis — consistently longer than cosmetic Botox because sweat gland physiology differs from muscle physiology. Palmar and plantar results last 3-6 months. With repeat treatments, some patients find results lasting progressively longer.
Get Help Now
Speak with a Haute MD Dermatology physician
Dr. Daniel Careaga
Double Board-Certified Plastic Surgeon
Dermatology · Coral Gables, FL
View Profile
Dr. Daniel Scott Karempelis
Dermatologist
Dermatology · Atlanta, Georgia, GA
View Profile
Dr. Bertha Baum
Board-Certified Dermatologist
Dermatology · Aventura, FL
View ProfileAre you a Dermatology physician?
Join Haute MD Network and have your profile featured alongside these answers.
Apply for the NetworkRelated Guides
Guide · BOTOX
Botox & Neurotoxins: Complete Guide
Botox and neurotoxins temporarily relax facial muscles to reduce wrinkles. Learn how they work, which areas they treat, and what separates a great result from a bad one.
Read GuideGuide · BOTOX
Botox for Migraines: How It Works and Who Qualifies
Botox is FDA-approved for chronic migraine prevention with 15+ migraine days per month. Learn how the treatment works, what to expect, and whether insurance covers it.
Read GuideGuide · BOTOX
Masseter Botox for Jaw Slimming: How It Works and Results
Botox injected into the masseter muscle slims the lower face and relieves jaw clenching. Learn how it works, how many units are needed, and how long results last.
Read Guide