Drooping Eyebrow After Botox

Eyebrow drooping after neuromodulators like Botox, Dysport or Xeomin is a rare but well described issue, usually resulting from product placement or the amount used. 
The first thing that needs to be determined is whether it is a droopy eyebrow or a droopy eyelid. Droopy eyebrows are much more common and result from over-immobilizing the only muscle on the forehead that is able to lift up our eyebrows - choosing the right amount and placement in the right patient is key to good forehead results. Droopy eyelids come from the product getting into the wrong muscle that elevates the eyelid. 
Management of them is quite different, but both have strategies to help expedite resolution while waiting for them to resolve with time, and any experience injector should be very familiar with how to deal with them: drops for the eyelids and precise placement of Botox in the brow depressors when it is an eyebrow issue. 
To ensure you are receiving the highest level of care, seek out a modernly trained, new-school dermatologic surgeon, oculoplastic surgeon, facial plastic surgeon or plastic surgeon who is board certified and fellowship trained in one of these "core four" cosmetic specialties. Membership in organizations like the American Academy of Facial Plastic and Reconstructive Surgery help to identify a highly trained surgeon.
Cameron Chesnut#realself500 Physician

So, the good news is that Botox is NOT permanent and although the full effects of Botox typically last 3-4 months, muscles that are inadvertently affected (as in your case) typically receive less of a dose and I predict your brow will likely return sooner to its pre-injection state...The key is what do now…A droopy eye-BROW from Botox can sometimes be improved with Botox injected into the outside part of the eye (the lateral aspect of the orbicularis oculi muscle) to generate a bit of a brow lift in that area – by paralyzing the orbicularis muscle that normally acts to depress the brow, you may get a slight compensatory brow lift with Botox to that area.  In the future, be sure to seek the services of an experienced physician injector. I think the key with Botox lies in truly understanding the anatomy of the injected area, and more importantly the variability in the anatomy between patients -- for brows, the forehead, and anywhere else you plan on receiving a Botox injection. This includes having a firm understanding of the origin, insertion, and action of each muscle that will be injected, the thickness of each muscle targeted, and the patient variability therein. As an aesthetic-trained plastic surgeon, I am intrinsically biased since I operate in the area for browlifts and facelifts, and have a unique perspective to the muscle anatomy since I commonly dissect under the skin and see the actual muscles themselves. For me, this helps guide where to inject and where not to. However, with that said, I know many Dermatologists who know the anatomy well despite not operating in that area, and get great results.Good luck.

One of the risks of botox treatment is that muscles other than those targeted can be affected by the treatment. That risk is less likely when your treatment is performed by an experienced doctor. Botox treatment's effects are temporary. Because non-targeted muscles do not receive the full dose of your botox treatment, the effects in non-targeted muscles typically resolve well before the effects in targeted muscles. There is no way to immediately reverse the effects of botox. In some cases, unintended asymmetry may be amenable to improvement by performing a touch up treatment on the other side. Always discuss your concerns with your doctor. Good luck.