Is is safe to have lip filler before going into hospital for a surgery under general anaesthetic?

 Thanks for your question. I don't see why this would be a problem.  You certainly don't have to worry about any kind of an interaction between the filler and the anesthetic. Best of luck to you!

You will not have any problems with your filler if it is done at least a week or so before the general anesthesia. You want the filler to settle  before the lips and mouth are manipulated which is frequently done with general anesthesia.