Medically reviewed and updated for accuracy by Dr Meg Minasian, MBBS, FRCOphth. (Last reviewed: May 2026)
Botulinum toxin is used medically in the treatment of hyperhidrosis, a condition involving excessive sweating beyond what is normally required for temperature regulation.
Hyperhidrosis may affect quality of life significantly and can influence:
- social interaction
- confidence
- work
- clothing choices
- daily activities
- physical comfort
BTX is used in selected cases with the aim of reducing excessive sweat gland activity in targeted areas.
What Is Hyperhidrosis?
Hyperhidrosis refers to excessive sweating that may occur even in cool environments or without significant physical exertion.
Commonly affected areas include:
- underarms (axillary hyperhidrosis)
- palms
- soles of the feet
- forehead
- scalp
The condition may occur in isolation or alongside other medical factors.
How Does BTX Reduce Sweating?
Sweat glands are stimulated by nerve signals involving acetylcholine, the same neurotransmitter involved in muscle contraction.
Botulinum toxin reduces release of acetylcholine from nerve endings.
When used in hyperhidrosis treatment, this may reduce stimulation of sweat glands in the treated area and therefore decrease sweating activity.
How Is Treatment Performed?
Treatment usually involves multiple small injections distributed across the affected region.
Injection patterns vary depending on:
- treatment area
- sweating severity
- anatomy
- patient factors
The procedure is commonly performed in outpatient clinical settings.
How Long Does Treatment Last?
Effects are temporary.
Duration varies between individuals and treatment areas, although improvement commonly lasts several months before gradual return of sweating activity occurs.
Repeat treatment may be required in some cases.
Potential Side Effects
Potential side effects depend partly on the treatment area.
They may include:
- discomfort during injection
- bruising
- temporary muscle weakness
- altered grip strength when treating palms
- local irritation
- temporary asymmetry
Most side effects are temporary.
Hyperhidrosis and Quality of Life
Although excessive sweating is sometimes underestimated socially, hyperhidrosis can significantly affect:
- psychological wellbeing
- occupational function
- social confidence
- clothing limitations
- physical comfort
Management therefore often involves consideration of both physical and quality-of-life factors.
Ongoing Research and Clinical Practice
Research into hyperhidrosis treatment continues in areas including:
- injection techniques
- treatment duration
- pain reduction during treatment
- combination therapies
- novel formulations
- quality-of-life outcomes
Botulinum toxin remains an established therapeutic option within hyperhidrosis management.
Frequently Asked Questions
Is BTX used medically for excessive sweating?
Yes. Botulinum toxin is an established treatment option for certain forms of hyperhidrosis.
How does BTX reduce sweating?
BTX reduces release of acetylcholine, which helps stimulate sweat gland activity.
Which areas can be treated?
Common areas include the underarms, palms, soles and forehead.
Is treatment permanent?
No. Effects are temporary and sweating gradually returns over time.
Can treatment affect hand strength?
Temporary weakness may occasionally occur when treating the palms.
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The information provided on BTXExpert is intended for educational purposes only and should not be considered medical advice. Individuals should seek personalised advice from an appropriately qualified healthcare professional regarding diagnosis, treatment suitability, risks and alternatives.