BUPIVACAINE HCL W/.05% Epinephrine Anesthesia may last two to three times longer than lidocaine and mepivacaine for dental use, in many patients up to 7 hours. Onset of action is usually 2 to 10 minutes. No-methylparaben formulation to avoid allergic reactions on sensitive patients. 100 percent latex free components to help reduce allergic responses. Terminal sterilization of product/cartridges for safe use. Mylar label covered glass cartridges to minimize risk of wound in the event of a cartridge breakage. Cartridges packed 10 to a blister tray to avoid glass to glass contact, hence reducing breakage.