Side Effects of Botox for Hyperhidrosis

Introduction

Botulinum toxin (commonly known as Botox) is an effective treatment for excessive sweating (hyperhidrosis) in areas such as underarms, hands, feet, or face. It works by blocking the nerve signals that activate sweat glands, reducing perspiration in the treated zone. Like all treatments, it carries the possibility of side effects. At Bayswater Dental Clinic, we prioritise safety and transparency, ensuring you know exactly what to expect.

Common Side Effects

Discomfort, stinging, or pain at injection sites
Redness, swelling, or bruising around treated areas
Temporary muscle weakness or weakness in nearby muscles (especially with hand or foot treatments)
Headache, flu-like symptoms, or fatigue
Compensatory sweating — increased sweating in untreated areas
Dryness of skin in the treated region (especially in facial or underarm areas)

These effects are generally mild and resolve within a few days to a few weeks.

Less Common & Rare Effects

Spread of toxin effect — muscle weakness, drooping, or asymmetry in nearby areas
Allergic reactions — rash, itching, swelling, or severe reactions (rare)
Infection at injection sites
Numbness or tingling in or around treated zones
Difficulty with fine motor skills (e.g., weak grip after palm injections)
Compensatory sweating in other body areas

In extremely rare cases, systemic effects like difficulty breathing, swallowing, or speaking may occur and require immediate medical care.

Why These Side Effects Occur

Diffusion: Botox may spread beyond the target zone if injected too superficially or in higher doses.
Anatomical proximity: Areas with many muscles or nerves (e.g., face, hands) are more prone to cross-effects.
Patient sensitivity: Individual anatomy and reaction vary, influencing outcomes.
Technique & dose: Precise injection and correct dosage minimise unwanted effects.

How to Minimise Risks

Choose an experienced, qualified practitioner.
Use the lowest effective dose possible.
Follow all aftercare instructions carefully (e.g., avoid rubbing treated areas).
Avoid combining Botox with other injections nearby on the same day.
Discuss your medical history, medications, and any neuromuscular conditions during consultation.

When to Contact Us

You should reach out immediately if you experience any of the following:

Persistent or worsening pain, swelling, or redness
Muscle weakness spreading beyond the treated area
Drooping eyelids, facial asymmetry, or difficulty speaking/swallowing
Signs of infection such as heat, discharge, or increasing redness
Breathing difficulty, vision changes, or severe allergic reactions

Call us at 020 7229 4627 or email info@bayswaterdental.co.uk for prompt assistance.

Frequently Asked Questions

Will I lose sweating function entirely?

No. Botox reduces excessive sweating but doesn’t eliminate normal basal sweating completely.
How long do side effects last?

Most side effects fade within a few days to two weeks. Temporary muscle weakness resolves as the effect wears off over months.
Is Botox safe long-term for hyperhidrosis?

Yes. When properly administered, Botox is considered safe for repeated use every 4–6 months under medical supervision.
Can I have Botox with certain medical conditions?

Some medical conditions (like neuromuscular diseases or infections) may increase risk. Your practitioner will assess suitability during consultation.
Will it affect muscles used for other tasks?

Rarely. Minor temporary weakness can occur near injection zones, especially in palms or facial areas, but careful planning minimises this risk.