What is the maximum recommended dose of epinephrine per dental appointment for a healthy adult?

• A. 0.2 mg per appointment
• B. 0.04 mg per appointment
• C. 2.0 mg per appointment
• D. 1.0 mg per appointment

Answer: (A)

Epinephrine is added to dental local anesthetics to constrict blood vessels, limit systemic absorption, and prolong anesthesia, but it also can raise heart rate and blood pressure. To protect patients from cardiovascular stress while still providing the vasoconstrictive benefit, a maximum per appointment is set. For a healthy adult, the recommended ceiling is 0.2 mg of epinephrine per appointment. This limit is chosen because it balances safety with the practical needs of anesthesia; a typical cartridge of lidocaine with epinephrine at 1:100,000 contains about 0.018 mg, so reaching 0.2 mg would require roughly 11 cartridges—far more than is normally used in a single visit. The much lower figure of about 0.04 mg per appointment is reserved for patients with cardiovascular disease or other risk factors, reflecting their increased sensitivity to epinephrine.