Durability of Botulinum Toxin Treatment for Axillary Hyperhidrosis

ObjectivesBotulinum toxin injection effectively treats axillary hyperhidrosis. Durability estimates of 3–14 months, based on self re-referral may overestimate duration. Our objective was to determine treatment durability by active follow-up of patients.DesignAudit of current practice.Materials and methodsPatients presenting with severe primary axillary hyperhidrosis were actively followed up for 24 months after intradermal injections of Botulinum Toxin A (Dysport™ 120 units/axilla). A 10-point Likert Scale (1 = worst imaginable symptoms, 10 = absolute resolution) and the Hyperhidrosis Disease Severity Score (HDSS) were used at 1 day and 3, 6, 12 and 24 months. We offered re-treatment when symptoms returned to the pre-intervention state.ResultsWe treated 45 patients with a mean age of 29 (15–49) years of whom 36 (78%) were women. The median pre-treatment Likert score (i.q.r.) of 3 (2–3) improved to 10 (10–10) on day 1. Scores at 3 (n = 44), 6 (n = 43) and 12 (n = 39) months were 10 (10–10), 8 (7.5–10), and 7 (5–8) respectively. The median 24-month score was 3 (3–6) for 35 patients, including 11 patients with scores ≥6 who have not required re-treatment. HDSS scores followed a similar pattern.ConclusionsAxillary botulinum toxin treatment is durable. Patients experience gradual return of symptoms between 6 and 24 months. A minority do not require re-treatment at this time.