Exactly where can I get my prescription for generic Latisse filled?

I don't know what a prescription for generic Latisse is, so whomever gave it to you also should have told you where to get it filled. Latisse is the only FDA approved prescription and the one that pharmacies will stock or order for you. A "generic" version may not be the real thing, and a registered pharmacy may not be able to get it for you. "This answer has been solicited without seeing this patient and
cannot be held as true medical advice, but only opinion. Seek in-person
treatment with a trained medical professional for appropriate care."