2& 1/2 Units of Botox Injected into Each Side of Mouth, Now One Side is Drooping, How Long Will It Last?

For upper lip "smokers" lines, I typically use 1 unit per injection into 2 points on each side (4 injections)-- with a maximum of 2 units per injection.  This area is extremely sensitive to minor variations in Botox, as you are experiencing.

While Botox typically last 4 months, with a common range of 3-6 months, in the frown lines of the forehead and glabella, I find the results around the mouth last less.  This is precisely because we are just trying to weaken, instead of paralyzing, the muscles around the mouth.  I would expect your side-effects to peak by 1-2 weeks and probably be markedly reduced by 4-6 weeks.  I would NOT chase an undesirable result with a "corrective procedure" with a filler--- just give it time.  I DO love using fillers and Botox in combination for a given result that is planned. I think you may develop another set of concerns when you try to "fix" this particular problem--- either from the fix itself, or after the Botox results wear off.

 

Injection of Juvederm® and BOTOX® at the same time can create a confusing picture.  Since you are just one week out there may be some lingering swelling from the filler injection and things may improve for you.  If the problem is purely BOTOX® related then the problem will likely last for a few weeks but slowly improve after that.  Good luck.