Too Much Botox Injected on Area

Hi Bam Bam,
Any undesirable effects of the "Oops, I just emptied the entire syringe of neurotoxin into your head" injection should be apparent within 3 to 10 days after the injection. This is one case where you hope that your injector diluted or watered down your Botox. The effects will depend upon the number of units injected and the area injected.
Let us know how it turns out, hopefully no harm, no foul.
Dr. P

BamBam,
The side-effect of too much Botox injected into one area really depends on where it was injected and how much was injected. The absolute amount of Botox injected likely is not more than 100 U (assuming that your doctor was using a highly concentrated technique and injected the entire syringe). Most likely, there was 50 or 25 units in the syringe.
Even if it was 100 units, you should not have any systemic side-effects since we inject much, much more Botox for non-cosmetic patients. So, the real issue is where your Botox was over injected. Most likely, you will only have minor issues like a completely paralyzed forehead - especially since in the past the trend was to inject much more Botox than we inject these days.
You really will just have to wait and see. If it has already been a week since your injection, you are probably fine. In any case, the Botox will be gone in 3 to 6 months with no residual effects.