What Is Carbocaine with Neo-Cobefrin? Uses, Dosage, and What You Need to Know in 2026

If your dentist has mentioned using Carbocaine with Neo-Cobefrin for your procedure, you might be wondering what exactly this drug is and why it's different from other dental anesthetics. Here's everything you need to know — in plain language.

What Is Carbocaine with Neo-Cobefrin?

Carbocaine 2% with Neo-Cobefrin is the brand name for a combination dental anesthetic containing:

Mepivacaine hydrochloride 2% — the primary numbing agent (local anesthetic), an amide-type drug first introduced into dentistry in 1960

Levonordefrin 1:20,000 (Neo-Cobefrin) — a vasoconstrictor that narrows blood vessels at the injection site, slowing absorption and extending the duration of anesthesia

It is manufactured by Septodont, Inc. (formerly distributed under the Cook-Waite brand by Kodak/Carestream Health) and is available in 1.7 mL single-dose dental cartridges, 50 per box. It is intended exclusively for dental use, administered by injection.

What Is It Used For?

Carbocaine with Neo-Cobefrin is FDA-approved for production of local anesthesia for dental procedures by infiltration or nerve block in adults and pediatric patients. Common procedures it's used for include:

Cavity fillings (composite or amalgam restorations)

Root canal treatment (endodontics)

Tooth extractions (simple and surgical)

Crown preparation and dental implant placement

Periodontal surgery and scaling and root planing (deep cleaning)

Any procedure requiring extended operative time where prolonged pain control is needed

How Long Does It Last?

One of the key features of Carbocaine with Neo-Cobefrin is its duration. Because levonordefrin slows absorption by restricting blood flow at the site, the anesthetic lasts significantly longer than a plain formulation:

Upper jaw (maxilla): 1 to 2.5 hours of anesthesia

Lower jaw (mandible): 2.5 to 5.5 hours of anesthesia

Onset is rapid: 30 to 120 seconds in the upper jaw, 1 to 4 minutes in the lower jaw.

What Is the Dosage?

Dosage is determined by your dentist based on the procedure and your body weight. Each dental cartridge contains 1.7 mL, which is 34 mg of the 2% mepivacaine solution. For a typical adult:

Average dose for a single area: 1 cartridge (34 mg) is usually sufficient for infiltration or block of one area

Full mouth anesthesia: Approximately 5.3 cartridges (180 mg) is typically adequate for the entire oral cavity

Maximum adult dose: 6.6 mg/kg body weight, not to exceed 400 mg (approximately 11.8 cartridges for a 60 kg adult)

Who Should NOT Receive Carbocaine with Neo-Cobefrin?

Carbocaine with Neo-Cobefrin is contraindicated (should not be used) in:

Patients with known hypersensitivity or allergy to amide-type local anesthetics (like lidocaine, bupivacaine, prilocaine)

Patients with known sulfite allergy (the product contains potassium metabisulfite)

Used with extra caution in patients with cardiovascular disease, liver or kidney disease, elderly patients, pregnant or nursing women, and children (dose adjusted by weight).

How Is It Different from Regular "Novocaine"?

Despite what many patients call it, most dental anesthetics used today are NOT novocaine. Novocaine (procaine) is an older ester-type anesthetic rarely used in modern dentistry due to its higher rate of allergic reactions. Mepivacaine (Carbocaine) is an amide-type anesthetic with a lower allergy risk, similar potency to lidocaine, and better duration without a vasoconstrictor than most other amides.

Want to understand the science behind how this anesthetic works? Read our deep-dive on how Carbocaine with Neo-Cobefrin works. And if you need help locating a dental provider who stocks it near you, medfinder can help.