[Does dilution have an impact on cosmetic results with BoNT/A? Complex-protein-free BoNT/A for treatment of glabella lines]. / Beeinflusst die Verdünnung das kosmetische Ergebnis von BoNT/A? Komplexproteinfreies BoNT/A zur Behandlung der Glabellafalte.

BACKGROUND: In this 2-armed, randomized study we investigated the efficacy and tolerability of complex-protein-free botulinum neurotoxin type A (BoNT/A), applied in two different dilution volumes for treatment of glabellar lines. PATIENTS AND METHODS: 40 patients with grade 2-3 glabellar lines (Facial Wrinkle Scale) received treatment with 25U BoNT/A (Xeomin). 100U of botulinum neurotoxin were diluted in 2.5 ml (group I) or 4 ml sodium chloride solution (group II). Responders showed an improvement in the wrinkle score (independent rater) of at least one point. RESULTS. Response rates two weeks after treatment were 100% / 89.5%, at 3 months 84.2% / 64.7% and at 4 months 53.3% / 61.5% (groups I / II respectively). There was no significant difference between the two dilutions. CONCLUSION: Complex-protein-free botulinum neurotoxin type A in both dilutions effectively reduced severity of glabellar lines. There was no statistically significant difference in efficacy between the two dilutions.