Confirmed localised hyperhidrosis resistant to first-line treatments
The first fundamental criterion is primary localised hyperhidrosis – meaning it is not linked to an underlying illness – that is troublesome enough to affect quality of life. Botulinum toxin is indicated for primary axillary (underarm) hyperhidrosis.
Before considering botulinum toxin treatment, patients are advised to try first-line treatments such as antiperspirants based on aluminium salts or iontophoresis. If these are insufficiently effective or poorly tolerated, botulinum toxin injections offer a relevant treatment alternative.
Significant functional and/or social difficulties
The severity of hyperhidrosis is measured not only by the amount of sweat produced, but also by its impact on the patient's life. A suitable candidate for botulinum toxin is often someone whose excessive sweating interferes with :
- Professional activities (performance stress, interpersonal relationships).
- Social or personal life (discomfort in company, fear of contact, withdrawal).
- Clothing habits (visible stains, the need to change frequently).
- General comfort (a constant feeling of dampness, skin irritation).
Assessment scales such as the HDSS (Hyperhidrosis Disease Severity Scale) can be used during consultation to assess these difficulties objectively. A high score on this scale is a useful indicator for recommending botulinum toxin treatment.
Good general health and no contraindications
Botulinum toxin treatment is generally well tolerated, but it is not indicated for every patient. Certain medical contraindications must be ruled out during the assessment before treatment :
- Pregnancy and breastfeeding : as a precaution, injections are contraindicated during these periods.
- Known allergy to any component of the product.
- Neuromuscular diseases, such as myasthenia gravis, Lambert-Eaton syndrome or amyotrophic lateral sclerosis (ALS), in which botulinum toxin may worsen symptoms.
- Skin infection or active skin disease in the area to be treated.
A thorough clinical assessment checks that these factors are absent. The doctor also rules out secondary hyperhidrosis, which would require a different type of treatment.
Realistic expectations and good adherence
A suitable candidate for botulinum toxin is also informed and motivated, understanding how treatment works, its benefits, its limitations and the need to repeat it every six months. Contrary to some misconceptions, botulinum toxin does not permanently eliminate sweating : its effect is temporary, with an average duration of effectiveness of 4 to 6 months depending on the treated area.
It is therefore important that the patient :
- Accepts the need to repeat treatment periodically.
- Does not seek a systemic or generalised effect, as botulinum toxin acts locally and specifically in the area where it is injected.
- Is willing to follow post-injection instructions, particularly avoiding exercise, massage or intense heat in the hours following treatment.
This cooperative approach supports optimal care and high satisfaction with treatment.
Typical profile of a suitable candidate for botulinum toxin treatment of hyperhidrosis
To summarise, a suitable candidate for botulinum toxin is generally :
- Over 18 years old.
- In good general health, without neurological disease or contraindications.
- Experiencing confirmed, persistent primary axillary hyperhidrosis resistant to conventional treatments.
- Reporting clear functional or social difficulties.
- Realistic about the effects and duration of treatment.
- Ready to follow the medical protocol and recommendations after the procedure.
Botulinum toxin versus other hyperhidrosis treatments – when is it preferable ?
Botulinum toxin for primary axillary hyperhidrosis should not be considered the only solution, but a rational treatment step, often offered after other less invasive or less expensive treatments have failed.
Antiperspirants based on hexahydrated aluminium salts (often at 20 %) are the first-line treatment. They work by temporarily blocking the sweat ducts. Although effective in some patients, these products have several limitations : frequent skin irritation, effectiveness that varies by area (ineffective on the hands or feet), and a temporary effect often limited to a few hours.
Iontophoresis involves passing a low-intensity electrical current through skin immersed in water to temporarily block sweat gland activity. Mainly effective on the hands and feet, this method requires repeated sessions (often several times a week), considerable patient commitment and specific equipment.
By comparison, botulinum toxin treatment provides significant improvement with injections approximately once every 5 to 6 months, making it more compatible with the demands of everyday and professional life.
Some doctors prescribe anticholinergics (glycopyrrolate, oxybutynin) for diffuse or resistant hyperhidrosis. Their effectiveness can be satisfactory, but they often cause troublesome side effects : severe dry mouth, visual disturbances, constipation, difficulty concentrating or drowsiness.
As a locally acting treatment, botulinum toxin avoids systemic effects while providing targeted, predictable relief.
In the most extreme cases of hyperhidrosis, endoscopic thoracic sympathectomy may be considered. This surgical procedure aims to cut the nerve fibres responsible for excessive sweating. Although it can be effective, it carries several risks : compensatory sweating (often severe) elsewhere on the body, persistent chest pain, pneumothorax or neurological complications.
Botulinum toxin is therefore clearly preferable before considering any invasive or irreversible option, particularly because it is temporary, reversible and customisable.
Is botulinum toxin treatment for hyperhidrosis reimbursed ?
The question of reimbursement is legitimate, given the sometimes disabling impact of hyperhidrosis.
In Switzerland, treatment of severe axillary hyperhidrosis with botulinum toxin injections may be partly covered by basic health insurance (LAMal), provided that the diagnosis is well documented, first-line treatments have failed and treatment is performed by a doctor.
A medical report and a request for coverage may be required. Patients are advised to check the exact reimbursement arrangements directly with their health insurer.
