Can you reverse Restylane filler if you have had too much?

Yes, syringed based fillers such as Restylane, Juvederm, and Belotero can all be reversed or "dissolved' with a product called Vitrase or Hylenex.  The fillers mentioned above are part of a class of injectable products known as Hyaluronic acid dermal fillers.  Vitrase and Hylenex is a liquid that can be injected where the fillers were placed and dissolved rather quickly.  Most patients see results within hours with further improvement in 1-2 days.  It is difficult to control how much filler will be dissolved, so trying to reduce the amount of product in the area by 10%, 30% or 50%, for example, is very difficult to do or predict. I hope this helps.

Yes, absolutely. Hyaluronidase (a.k.a. Vitrase or Wydase) is an enzyme that dissolves hyaluronic acid (HA). This works on Restylane and all the other HA fillers (Juvederm, Perlane, Belotero, Voluma). As others have mentioned, however, the dosing is inexact. This should not be used a "sculpting" technique but rather as a rescue option in cases where the filler has caused a complication or you truly dislike the results.