The reason for the antibiotics is because your dentist wants to pull the
tooth!
Wisdom teeth are HUGE and leave a big
hole behind...(Mine even needed stitches..) An open hole in your gum is a direct path to your blood stream, and can even invite an infection into your heart...wisdom teeth normally get removed when they are threatening to become "impacted"...If your tooth isn't causing any problems, you may consider just getting the cavity filled...
Are you currently on treatment?