An epidural block is a regional analgesic that can be used during labor. An epidural block with more or stronger medications — anesthetics — can be used shortly before a C-section or if a vaginal birth requires the use of forceps or vacuum extraction. You'll be asked to sit or lie on your side with your back curved outward during the procedure. Medication is then injected into a small space outside the spinal cord in the lower back (epidural space). You might be given a test dose of medication to make sure the epidural is positioned correctly. If you don't experience any problems, you'll be given a full dose. It takes 10 to 20 minutes for the medication to take effect.