Bupivacaine HCL Injection 0.5% Single-Dose Vials 30 mL x 25/Box by Pfizer (RX)Bupivacaine HCL Injection 0. 5% is a local anesthetic used to provide prolonged pain relief during surgical, dental, and obstetrical procedures, including cesarean sections. It works by blocking nerve signals in the body, resulting in a temporary loss of sensation in the targeted area. This medication is especially useful for epidural anesthesia and peripheral nerve blocks. Due to its duration and potency, it must be administered with caution to avoid