Is it possible to take medication to calm your nerves before surgery?

Anxiety prior to surgery is very normal; its complete elimination is usually not possible. Assuming you have chosen your plastic surgeon carefully, other important "variables" such as anesthesia provider and surgery facility will be selected based on everyone's first priority: safety. This careful selection should give you some peace of mind that you will be safe around the time of surgery. Discuss your specific areas of concerns with your plastic surgeon who will be in the best position to help you calm your nerves.  

I ask my patients to try to be as calm as possible prior to surgery; this “calmness" tends to translate to a smoother postoperative course. You may be able to alleviate some pre operative anxiety with music, exercise, meditation, a glass of wine (if ok with your surgeon) and positive/objective focus on the long term outcome/benefits etc. prior to your procedure.
Generally, patients find that they did “get worked up for nothing” after their recovery is completed.
I hope this helps. 

It is normal for people to be very nervous before their operations, and that they manifest high blood pressure and anxiety attacks. Taking medication that reduces your anxiety may pose complications with your surgery. The best way to get rid of anxiety before your operation is the positive outlook in the surgery and assuring your self that you have done the right choice. Also you can drink water every now and then before the operation to sooth your nerves.