No, it is absolutely fine. If your surgery is in the morning of the 18th, then most often your surgeon will recommend that you have no food or drink after midnight the night before. But if you need too, on the morning of the surgery, you can even take medications (including norco) with small sips of water (but you should speak with your physician about this, and the anesthesiologist who will speak with you prior to surgery).
But up until the night of the 17th, you should be fine to take this medication. It will help relieve your pain, and won't have any adverse effects on the surgery whatsoever.
Hope this helps, and hope the surgery helps your back!
Dr. Fay
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