Pain Related to Local Anesthetic Administration for Nexplanon Placement

Either 3cc of unbuffered lidocaine (control) or 3cc of buffered 1% lidocaine (intervention) will be prepared and administered by the clinician. In a study investigating buffered lidocaine versus unbuffered lidocaine in intrauterine device insertion, investigators prepared 20cc of buffered lidocaine utilizing 18cc of 1% lidocaine (90%) and 2cc of 8.4% sodium bicarbonate (10%). 3 Thus, we will prepare 3cc of buffered lidocaine consisting of 2.7cc of 1% lidocaine and 0.3cc of 8.4% sodium bicarbonate.

For the control, 3cc of unbuffered lidocaine will be prepared and administered by the clinician.