Loss of movement in forehead after Botox. Will this go away?

I tell all my patients to wait a minimum 10-14 days before coming back to the office with any issues (unless of course it is life threatening).  At that time the full effect of the toxin can be seen and any irregularity can be fixed appropriately.  I wish you the best of luck, Dr. Emer.

Muscles can show a differential response to Botox - meaning some can take longer to take effect than others.  It's usually safest to wait 2 weeks before any "touch-ups" so that the Botox is in full effect.  

You describe that the left side of your forehead has no movement and the right side has some slight movement a week after your Botox treatment.  I would recommend waiting another week to see how it looks and if there is still a difference, you should contact the physician who treated you to be evaluated.  The issue most likely could easily be corrected with a touch up treatment.