How many milligrams of lidocaine are contained in one dental cartridge (1.7 mL) of 2% lidocaine?

A 2% solution contains 20 mg per mL (since percent concentration × 10 = mg/mL). One standard 1.7 mL dental cartridge of 2% lidocaine therefore contains 1.7 mL × 20 mg/mL = 34 mg of lidocaine. (Note: if calculating for multiple cartridges, simply multiply this per-cartridge amount by the number of cartridges administered — for example, two cartridges would total 68 mg.)