💉 Maximum Dose Results
| Agent | Concentration | MRD (mg/kg) | Max Dose (mg) | Cartridges (1.8mL) | Limiting Factor |
|---|
Local Anesthesia Dosage in Dental Practice
Safe local anesthesia administration requires understanding the maximum recommended dose (MRD) for each agent, the patient's weight, and any systemic factors that reduce the safe dose. Local anesthetic systemic toxicity (LAST) - though uncommon in dental practice - is largely preventable with correct weight-based dosing and aspiration technique.
The agents covered in this calculator represent all five primary local anesthetics used in UK and US dental practice. For blood pressure considerations that affect vasoconstrictor selection, use our Blood Pressure Dental Risk Checker. For medically compromised patients with elevated caries risk, our Caries Risk Assessment Tool provides a complementary clinical profile.
Maximum Recommended Doses - Key Values
All MRDs below are per-administration (single appointment) values for healthy adults. Reduce by 25–50% for ASA III–IV, elderly, paediatric, and hepatically impaired patients.
- Lidocaine 2% 1:100,000 epi: 4.4 mg/kg, max 300 mg (≈8.3 cartridges)
- Lidocaine 2% plain: 2.0 mg/kg, max 300 mg (≈8.3 cartridges)
- Articaine 4% 1:100,000 epi: 7.0 mg/kg, max 500 mg (≈6.9 cartridges)
- Mepivacaine 3% plain: 4.4 mg/kg, max 300 mg (≈5.6 cartridges)
- Bupivacaine 0.5% 1:200,000 epi: 1.3 mg/kg, max 90 mg (≈10 cartridges)
- Prilocaine 4% plain: 6.0 mg/kg, max 400 mg (≈5.6 cartridges)
Source: Malamed SF. Handbook of Local Anesthesia, 7th ed. Elsevier, 2020.
Special Patient Considerations
- Paediatric patients: Use weight-based MRD with no absolute maximum override - the weight-based limit is the critical constraint. Articaine is not recommended under age 4.
- Elderly patients (65+): Reduced hepatic metabolism - reduce dose by 25%. Prilocaine is preferred in cardiac patients due to lower vasoconstrictive requirement.
- Hepatic impairment: All amide local anesthetics are hepatically metabolised. Severe hepatic disease significantly increases plasma half-life - reduce dose by 50% and consider referral.
- Cardiovascular disease: The AHA/ADA guidelines limit epinephrine to 0.04 mg per appointment in patients with significant cardiac disease - equivalent to approximately 2.2 cartridges of 1:100,000 epi solution.
- Pregnancy: Lidocaine is FDA Category B and is the preferred agent. Prilocaine is also Category B. Bupivacaine and mepivacaine should be avoided near term.