For a full mouth extraction in a 70-kg adult, what is the maximum safe single dose of lidocaine with epinephrine infiltration?

For a full mouth extraction in a 70-kg adult, what is the maximum safe single dose of lidocaine with epinephrine infiltration?

• A. 200 mg
• B. 300 mg
• C. 400 mg
• D. 500 mg

Answer: (D)

The main idea is to dose lidocaine with epinephrine by body weight and then apply the practical ceiling for safe use. With epinephrine added, the maximum recommended dose is about 7 mg per kilogram of body weight. For a 70-kg adult, that calculates to roughly 490 mg, which is commonly rounded to 500 mg as the practical upper limit for a single administration. This limit protects against local anesthetic systemic toxicity while still allowing the vasoconstrictive benefits of epinephrine (reduced systemic uptake, better hemostasis, and prolonged effect). Since lidocaine with 1:100,000 epinephrine contains 20 mg per milliliter, 500 mg corresponds to about 25 mL of solution. In a full-mouth extraction, you’ll distribute injections across many sites, so you must keep the total volume (and thus total milligrams) under this 500 mg ceiling in one session. If more anesthesia is needed, you’d either wait for clearance or consider alternative strategies or anesthetics, always staying within patient-specific safety limits.

The main idea is to dose lidocaine with epinephrine by body weight and then apply the practical ceiling for safe use. With epinephrine added, the maximum recommended dose is about 7 mg per kilogram of body weight. For a 70-kg adult, that calculates to roughly 490 mg, which is commonly rounded to 500 mg as the practical upper limit for a single administration. This limit protects against local anesthetic systemic toxicity while still allowing the vasoconstrictive benefits of epinephrine (reduced systemic uptake, better hemostasis, and prolonged effect). Since lidocaine with 1:100,000 epinephrine contains 20 mg per milliliter, 500 mg corresponds to about 25 mL of solution. In a full-mouth extraction, you’ll distribute injections across many sites, so you must keep the total volume (and thus total milligrams) under this 500 mg ceiling in one session. If more anesthesia is needed, you’d either wait for clearance or consider alternative strategies or anesthetics, always staying within patient-specific safety limits.