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

This off-label use of Botox can soften lines but the placement of the botox may differ from physician to physician as does the number of units used. A droop can occur and this may last a few weeks to a few months. It will revert to normal eventually. Check with your doctor in case there can be some thing done to make you look more symmetric.

Firstly, I think that having Botox and Juvederm injected at the same the should be no problem at all. We do this all the time. Secondly, it would be good to know exactly where this botox was injected as my impression from reading your story seems to be different from some of the others. They are thinking of injections to remove wrinkles above lip(smoker's type lines). My thought was that you had the injections lateral to and below lips in muscle that pulls corners down. This would make a big difference as one might be corrected by injecting some in other side. Can you send a photo?

I use Botox to reduce vertical lines around the mouth often and most patients really like the results; but I start with 1 unit only in each side and then increase to a maximum of 2 units.  I have found above that it becomes too strong and patients have problems.  The effect will get a little worse over the next few days and then stabilize for a couple of weeks.  Then it should get better.  I would not recommend fillers because when the Botox wears off, you may not like the results.  I'm sorry this happened to you.  Hang in there!