How long prior to a Rhinoplasty/ Septoplasty, do I need to stop taking Allegra D?

This is an important question. Each rhinoplasty surgeon and anesthesiologist team have their own opinions on this. Ask your team if this will interfere with the common regimens that they use. Good luck

In this particular situation I would suggest contacting your surgeon to ask the same question.  In my practice, I prefer to have my patients off of the decongestants about a week prior to surgery primarily due to potential for issues related to blood pressure.  I do not feel that continuing antihistamines for your seasonal allergic issues is going to adversely effect your surgery or the healing process.  Good luck with your surgery!