Botox and Retin-A? When I do get Botox in the glabella area, can I continue using Retin-A as my nightly regime?

My frown lines (the 11s) were very bad a few months ago, but since recently starting Retin-A .1% (applying a good dab on these 11s nightly), I started noticing a big improvement with these lines. They’re softening up greatly, although not quite completely gone. Question: When I do get Botox in the glabella area, can I continue using Retin-A as my nightly regime? I’d like to continue my successful skincare maintenance. Please advise. Also, will using Retin-A the night before Botox affect the injection?