Botox and neurotoxins questions

About 3 to 4 months for frown lines, according to the Botox Cosmetic label. Dysport's label says up to 4 months. Daxxify kept frown lines none or mild for a median of about 24 weeks in its phase 3 trials.[1][2][3]

Within 1 to 2 days for most people. In one study, 48% noticed an effect by day 1 and physicians saw onset in all by day 4. The full effect builds through the first week and is measured at day 30.[1][2]

Labeled Botox Cosmetic doses are 20 units for frown lines, 24 for crow's feet, 40 for forehead and frown lines together, and 26 to 36 for neck bands. Dysport's frown-line dose is 50 units and Daxxify's is 40.[1][2][3]

All are botulinum toxin type A. Xeomin and Daxxify contain the neurotoxin without its accessory proteins. Daxxify lasted a median of about 24 weeks for frown lines in its trials. Each brand measures units with its own assay, so units cannot be converted between brands.[1][2][3]

The Botox Cosmetic label says the physician giving it must understand the anatomy of the muscles treated and any changes from prior surgery. A review found eyelid ptosis more frequent among inexperienced injectors.[1][2]

There are no adequate studies in pregnant women, and no data on the toxin in breast milk. In a 29-year safety database, major birth defects occurred in 0.7% of 152 exposed live births, within general population rates, with little data on later pregnancy.[1][2]

The labels are for adults, and safety has not been established in children. Botox Cosmetic was first approved for adults under 65, and Dysport is approved for frown lines in adults under 65. People 65 and older responded less often in trials.[1][2][3]

Neck bands: yes, Botox Cosmetic was FDA-approved for platysma bands in October 2024. Jaw: masseter treatment is off-label, though a phase 3 trial of 72 units narrowed the lower face by 5.2 mm on average.[1][2][3]

Rarely. Neutralizing antibodies formed in 0.5% of 5,876 subjects across Botox trials, and in none of the Daxxify phase 3 subjects. The label advises the lowest effective dose at the longest feasible interval.[1][2][3]

Eyelid ptosis followed 2% to 3% of frown-line treatments in trials. It starts 3 to 14 days after injection and resolves as the toxin wears off. Apraclonidine or oxymetazoline eye drops can partly reverse it.[1][2][3]