Is there a waiting period recommended for getting Botox after Blepharoplasty? Only 3 weeks PO, but I'm anxious to get started

Usually there is no reason not to do Botox after blepharoplasty.
However after lower blepharoplasty, particularly when the canthus has been tightened or a cheeklift has been performed, it is best to wait 3+ months. The reason for this is that some lower eyelid surgeries performed through the lower eyelid, or cheeklift procedures can weaken the lower fibers of the orbicularis muscle.
Botox could further weaken the orbicularis fibers, causing a lag in the lower eyelid and drooping.
It is best to talk to your surgeon to see if any of this applies to your procedure.
There should be no reason not to perform Botox injections in the frown muscles for any of these procedures.

Dear Jen,
You have waited long enough for the BOTOX. Typically, with Microdroplet BOTOX, I find that most people can have BOTOX about a week after surgery. However, it really helps if your injector knows what they are doing.
However, we have found that BOTOX done at the time of surgery or even a few days prior to surgery, can be subjected to abnormal spreading of the BOTOX when it is done in the immediate surgical area. This can lead to some unpleasant surprises. So waiting like you have is very reasonable.

That is a very good question and there are no definitive guidelines, only opinions based upon individual experiencea. There is no doubt that injection techniques will have an impact on the outcome. The primary concern is that if it is injected at or soon after surgery, the botox may spread far beyond its intended target due to the surgical disruption of the tissues.

Your surgeon may choose to administer Botox at the time of surgery, if it is in a location that is distant from the surgical site, like neck bands for example.
However, if your question pertains to the crows feet area for example, depending on the extent of your blepharoplasty, your surgeon may choose to wait, or may choose to administer it at any other appropriate time, including the time of the surgery. Three weeks post op seems sufficient to me, but there are very few "absolute" answers in medicine. Like all things, the best choice is to discuss your concerns with your Doctor, who will be more familiar with exactly what was done in your case.

It is probably okay for you to have botox 3 weeks after surgery. Check with your doctor first to see if it is okay with him.