Why Can't You Lie Down After Botox?

We generally advise not to put any pressure on the injection sites or exercise for 24 hours after injection to prevent spread of the treatment. Otherwise, it is ok to lie down.

My patients are instructed that they cannot lie FACE down, rub the face, get a facial massage, exercise, or invert their head for 4 hours after Botox injections, but lying flat on the back is not something I instruct my patients to refrain from.
Always see an expert physician injector.
All the best,

I would not worry too much about lying down.  If however, you are planning to sleep and you sleep on your side and squish the sides of your face where you had injections, I might caution you to wait a few hours.  This might be akin  to you rubbing your area of injection.