When injected with 30 units of Xeomin in glabella can you inject 20 units of botox in glabella 2 weeks later?

No, there won't be an adverse reaction between Botox and Xeomin. I recommend getting a formal consultation with an expert.  You can always add more toxin but you cannot remove it.  Best, Dr. Emer

I would not expect any problems with injecting Botox to the glabella 2 weeks after Xeomin was injected there.  The dosing would be up to the physician treating you.