From the Research
For palmar hyperhidrosis treatment with Botox (onabotulinumtoxinA), the recommended dosage is typically 50-100 units per palm, as supported by the most recent and highest quality study available 1. The injection technique involves multiple small intradermal injections distributed in a grid-like pattern across the palm, with approximately 1-2 units injected at each site, spaced about 1-1.5 cm apart. Key considerations for the injection technique include:
- Targeting the entire palmar surface, focusing on areas of maximum sweating
- Avoiding the thenar and hypothenar eminences to minimize risk of muscle weakness Pain management is essential as palmar injections are uncomfortable; options include:
- Ice application
- Topical anesthetics
- Nerve blocks (median/ulnar)
- Procedural sedation in sensitive patients The onset of effect typically occurs within 2-7 days, with peak effect at 2 weeks, and results lasting 4-6 months before retreatment is needed, as reported in studies such as 2 and 1. Botox works by blocking the release of acetylcholine from sympathetic nerves that stimulate eccrine sweat glands, thereby reducing sweat production. Potential side effects include:
- Temporary hand weakness (5-10% of patients)
- Pain at injection sites
- Rarely, compensatory hyperhidrosis in untreated areas It is worth noting that while other studies, such as 3 and 4, provide additional information on the treatment of palmar hyperhidrosis, the most recent and highest quality study 1 provides the most relevant guidance for clinical practice. Additionally, a review of management strategies for palmar hyperhidrosis 5 highlights the importance of individualized treatment approaches, taking into account disease severity, benefit-to-risk profile, treatment cost, patient preference, and clinician expertise.