Will it be too late to have a top up after 4 weeks?

You should be fine getting additional units of Botox at 4 weeks. There should be no issue with that timing. Having said that, hopefully you have confidence in your injector and i would recommend if you serve as a “model” for trainees, that the supervising provider is someone with experience.Best wishes,Pamela Stuart, MD

Hello and thanks for your question. Yes you can have a top up at 4 weeks post your first treatment and this will cause no issues.  Always go to a qualified and experienced practitioner, best wishes