How Long Before Asymmetry from Botox Gets Corrected?

When the Botox is fully worn off, when you can actually move the forehead fully, the asymmetry should be gone at that time. It’s not unusual to see symmetry redevelop before the lines come back. You are probably very close to seeing your normal appearance. Be patient, it’s coming.

Dear Fran
BOTOX typically lasts about 4 months. There can be a slightly longer duration from muscle retraining. However at this point the medication is no longer effective. This would be a good time to consider retreatment.
Of course the key is find someone you have confidence in and knows what they are doing. An experienced injector should be able to adjust your treatment to account for your asymmetries.
Dr. Steinsapir

Dear Fran,
You should have near complete mobility of your forehead very soon. The most common "bad" outcome from BOTOX in the forehead is slight brow-drop that makes your upper eyelid skin bothersome.
It will all completely go back to it's pre-injection condition shortly, so sit tight for another couple of weeks.
Best regards.

For future reference, Botox should be corrected at about 2 weeks. Slight differences in muscle strength can result in asymmetry, but it is easily corrected by a touch-up. You should not even have a charge for this service, since it is a correction. Go to an experienced, appropriately board certified doctor next time who knows how to give you a perfect effect from Botox.

The asymmetry you are experiencing should resolve within 4 months from the time of injection.  In the future, you might want to address any asymmetries with your treating physician 2 weeks after your Botox injections (when the treatment takes full effect).
Good luck.