It takes a few days for Botox to work.
- It takes 4 days to reach 90% activity.
- It takes 2 weeks to reach 100% activity.
Thus if you feel like you need more Botox, I usually recommend waiting 2 weeks before adding more Botox. This way we see the full effect of Botox before adding more. I do believe in using Botox efficiently (without wasting it on the patient).