Polocaine Dental

DESCRIPTION

Mepivacaine Hydrochloride, a tertiaryamineused as a localanesthetic, is 1-methyl-2’, 6’ - pipecoloxylidide monohydrochloride with the following structural formula:

It is a white, crystalline, odorless powder soluble in water, but very resistant to both acid and alkaline hydrolysis.

Levonordefrin, a sympathomimetic amine used as a vasoconstrictor in local anesthetic solution, is (-)- -(1-Aminoethyl)-3, 4-dihydroxybenzyl alcohol with the following structural formula:

It is a white or buff-colored crystalline solid, freely soluble in aqueous solutions of mineral acids, but practically insoluble in water;

DENTAL CARTRIDGES MAY NOT BE AUTOCLAVED.

3% Polocaine® DENTAL (mepivacaine hydrochloride injection 3%) and 2% Polocaine® DENTAL with Levonordefrin 1:20,000 (mepivacaine hydrochloride 2% with levonordefrin 1:20,000 injection) are sterile solutions for injection.

COMPOSITION:	CARTRIDGE
Each mL contains:	2%	3%
Mepivacaine Hydrochloride	20 mg	30 mg
Levonordefrin	0.05 mg	-
Sodium Chloride	4 mg	6 mg
Potassium metabisulfite	1.2 mg	-
Edetate disodium	0.25 mg	-
Sodium Hydroxide q.s. ad pH; Hydrochloric Acid	0.5 mg	-
Water For Injection, qs. ad.	1 mL	1 mL

The pH of the 2% cartridge solution is adjusted between 3.3 and 5.5 with NaOH.

The pH of the 3% cartridge solution is adjusted between 4.5 and 6.8 with NaOH.

INDICATIONS

Mepivacaine is indicated for production of local anesthesia for dental procedures by infiltration or nerve block in adults and pediatric patients.

DOSAGE AND ADMINISTRATION

As with all local anesthetics, the dose varies and depends upon the area to be anesthetized, the vascularity of the tissues, individual tolerance and the technique of anesthesia. The lowest dose needed to provide effective anesthesia should be administered. For specific techniques and procedures refer to standard dental manuals and textbooks.

For infiltration and block injections in the upper or lower jaw, the average dose of 1 cartridge will usually suffice.

Each cartridge contains 1.7 mL (34 mg of 2% or 51 mg of 3%).

5.3 cartridges (180 mg of the 2% solution or 270 mg of the 3% solution) are usually adequate to effect anesthesia of the entire oral cavity. Whenever a larger dose seems to be necessary for an extensive procedure, the maximum dose should be calculated according to the patient’s weight. A dose of up to 3 mg per pound of body weight may be administered. At any single dental sitting the total dose for all injected sites should not exceed 400 mg in adults.

The maximum pediatric dose should becarefullycalculated.

Maximum dose for pediatric population = Child’s Weight (lbs.) / 150 X Maximum Recommended Dose 150 for Adults (400 mg)

The following table, approximating these calculations, may also be used as a guide. This table is based upon a recommended maximum for larger pediatric population of 5.3 cartridges (the maximum recommended adult dose) during any single dental sitting, regardless of the pediatric patient’s weight or (for 2% mepivacaine) calculated maximum amount of drug:

Weight (lb.)	Maximum AllowableDosage*
	3% Mepivacaine Plain 3 mg/lb (270 mg max.)		2% Mepivacaine 1:20,000 Levonordefrin 3 mg/lb (180 mg max.)
	mg	Number of Cartridges	mg	Number of Cartridges
20	60	1.2	60	1.8
30	90	1.8	90	2.6
40	120	2.3	120	3.5
50	150	2.9	150	4.4
60	180	3.5	180	5.3
80	240	4.7	180	5.3
100	270	5.3	180	5.3
120	270	5.3	180	5.3
* Adapted from Malamed, Stanley F: Handbook of medical emergencies in the dental office, ed. 2, St. Louis, 1982. The C.V. Mosby Co.

When using Polocaine® for infiltration or regional blockanesthesia, injection should always be made slowly and with frequentaspiration.

Any unused portion of a cartridge should be discarded.

Parenteraldrug products should be inspected visually for particulate matter and discoloration prior to administration, whenever solution and container permit.

Disinfection Of Cartridges

As in the case of any cartridge, thediaphragmshould be disinfected before needle puncture. The diaphragm should be thoroughly swabbed with either pure 91% isopropyl alcohol or 70% ethyl alcohol, USP, just prior to use. Many commercially available alcohol solutions contain ingredients which are injurious to container components, and therefore, should not be used. Cartridges should not be immersed in any solution.

HOW SUPPLIED

3% Polocaine® DENTAL; (Mepivacaine Hydrocholoride Injection USP) (NDC66312-441-16 ) is available in cardboard boxes containing 5 blisters of 10 x 1.7 mL dental cartridges, 50 per carton.

2% Polocaine® DENTALwith Levonordefrin 1:20,000 (Mepivacaine Hydrochloride and Levonordefrin Injection; USP) (NDC66312-461-16) is available in cardboard boxes containing 5 blisters of 10 x 1.7 mL dental cartridges, 50 per carton.

Both solutions should be stored at controlled room temperature, below 25° C (77° F).

Protect from light.Do not permit to freeze. BOXES: For protection from light, retain in box until time of use. Once opened, the box should be reclosed by closing the top flap. The 2% Polocaine® DENTAL with Levonordefrin 1:20,000 solution should not be used if its color is pinkish or darker than slightly yellow or it contains a precipitate. Cartridge warmers should not be used with Polocaine® products.

制造:由Novoc DENTSPLY制药ol Pharmaceutical of Canada, Inc., Cambridge, Ontario, Canada N1R 6X3. Revised: Mar 2009

SIDE EFFECTS

Reactions to Polocaine® are characteristic of those associated with other amide-type local anesthetics. Systemic adverse reactions involving thecentral nervous systemand thecardiovascular system通常从高血浆水平(可能结果be due to excessive dosage, rapid absorption, inadvertent intravascular injection, or slow metabolic degradation), injection technique, or volume of injection.

A small number of reactions may result from hypersensitivity, idiosyncrasy or diminished tolerance to normal dosage on the part of the patient.

Persistent paresthesias of the lips, tongue, and oral tissues have been reported with the use of mepivacaine, with slow, incomplete, or no recovery. These post-marketing events have been reported chiefly following nerve blocks in themandibleand have involved thetrigeminal nerveand its branches.

Reactions involving thecentral nervous systemare characterized by excitation and/or depression. Nervousness, dizziness, blurred vision, or tremors may occur followed by drowsiness, convulsions, unconsciousness, and possible respiratory arrest. Since excitement may be transient or absent, the first manifestations may be drowsiness merging into unconsciousness and respiratory arrest.

Cardiovascular reactionsare depressant. They may be the result of direct drug effect or more commonly in dental practice, the result ofvasovagal reaction, particularly if the patient is in the sitting position. Failure to recognize premonitory signs such as sweating, feeling of faintness, changes inpulseorsensoriummay result in progressive cerebralhypoxiaandseizureor seriouscardiovascularcatastrophe. Management consists of placing the patient in the recumbent position and administration of oxygen. Vasoactive drugs such as Ephedrine or Methoxamine may be administered intravenously.

Allergic reactions are rare and may occur as a result of sensitivity to the local anesthetic and are characterized bycutaneouslesions of delayed onset orurticaria, edema and other manifestations ofallergy. The detection of sensitivity by skin testing is of limited value. As with other local anesthetics, anaphylactoid reactions to mepivacaine have occurred rarely. The reaction may be abrupt and severe and is not usually dose related. Localized puffiness and swelling may occur.

DRUG INTERACTIONS

Clinically Significant Drug Interactions

局部麻醉管理的解决方案ontaining vasopressors, such as Levonordefrin,Epinephrineor Norepinephrine, to patients receivingtricyclic antidepressantsor monoamine oxidase inhibitors may produce severe, prolongedhypertension. Concurrent use of these agents should generally be avoided. In situations when concurrent therapy is necessary, careful patient monitoring isessential.

Concurrent administration of vasopressor drugs and ofergot-type oxytocic drugs may cause severe, persistent hypertension orcerebrovascularaccidents.

Phenothiazines and butyrophenones may reduce or reverse thepressoreffect of Epinephrine.

Solutions containing a vasoconstrictor should be used cautiously in the presence of diseases which may adversely affect the patient's cardiovascular system. Serious cardiac arrhythmias may occur if preparations containing a vasoconstrictor are employed in patients during or following the administration of potent inhalation anesthetics.

MEPIVACAINE SHOULD BE USED WITH CAUTION IN PATIENTS WITH KNOWN DRUG ALLERGIES AND SENSITIVITIES. A thorough history of the patient's prior experience with mepivacaine or other local anesthetics as well as concomitant or recent drug use should be taken (seeCONTRAINDICATIONS). Patients allergic to methylparaben orpara-aminobenzoic acidderivatives (procaine, tetracaine, benzocaine, etc.) have not shown cross-sensitivity to agents of the amide type such as mepivacaine. Since mepivacaine is metabolized in the liver and excreted by the kidneys, it should be used cautiously in patients with liver and renal disease.

警告

RESUSCITATIVE EQUIPMENT AND DRUGS SHOULD BE IMMEDIATELY AVAILABLE. (SeeADVERSE REACTIONS).

Reactions resulting in fatality have occurred on rare occasions with the use of local anesthetics, even in the absence of a history of hypersensitivity.

Fatalities may occur with use of local anesthetics in the head and neck region as the result of retrograde arterial flow to vital CNS areas even when maximum recommended doses are observed. The practitioner should be alert to early evidences of alteration in sensorium or vital signs.

The solution which contains a vasoconstrictor (2% Polocaine® DENTAL with Levonordefrin 1:20,000) should be used with extreme caution for patients whosemedical historyand physical evaluation suggest the existence of hypertension, arteriosclerotic heart disease,cerebral vascularinsufficiency,heart block, thyrotoxicosis anddiabetes, etc.

The solution which contains a vasoconstrictor (2% Polocaine® DENTAL with Levonordefrin 1:20,000) also containspotassiummetabisulfite, a sulfite that may cause allergic-type reactions including anaphylactic symptoms and life-threatening or less severeasthmaticepisodes in certain susceptible people.

The overallprevalenceofsulfite sensitivityin the general population is unknown and probably low. Sulfite sensitivity is seen more frequently in asthmatic than in non-asthmatic people. 3% Polocaine® DENTAL is SULFITE FREE.

Polocaine®, along with other local anesthetics, is capable of producing methemoglobinemia. The clinical signs of methemoglobinemia are cyanosis of the nail beds and lips, fatigue and weakness. If methemoglobinemia does not respond to administration of oxygen, administration of methylene blue intravenously 1-2 mg/kg body weight over a 5 minute period is recommended.

The American Heart Association has made the following recommendations regarding the use of local anesthetics with vasoconstrictors in patients with ischemicheart disease: “Vasoconstrictor agents should be used in local anesthesia solutions during dental practice only when it is clear that the procedure will be shortened or theanalgesiarendered more profound. When a vasoconstrictor is indicated, extreme care should be taken to avoid intravascular injection. The minimum possible amount of vasoconstrictor should be used.” (Kaplan, EL, editor:Cardiovascular diseasein dental practice, Dallas 1986, American Heart Association.)

PRECAUTIONS

The safety and effectiveness of mepivacaine depend upon proper dosage, correct technique, adequate precautions, and readiness for emergencies.

The lowest dose that results in effective anesthesia should be used to avoid high plasma levels and possible adverse effects. Injection of repeated doses of mepivacaine may cause significant increase in blood levels with each repeated dose due to slow accumulation of the drug or its metabolites, or due to slower metabolic degradation than normal.

Tolerance varies with the status of the patient. Debilitated, elderly patients, acutely ill patients, and children should be given reduced doses commensurate with their weight and physical status.

Mepivacaine should be used with caution in patients with a history of severe disturbances of cardiac rhythm or heart block.

INJECTIONS SHOULD ALWAYS BE MADE SLOWLY WITH ASPIRATION TO AVOID INTRAVASCULAR INJECTION AND THEREFORE SYSTEMIC REACTION TO BOTH LOCAL ANESTHETIC AND VASOCONSTRICTOR.

If sedatives are employed to reduce patient apprehension, use reduced doses, since local anesthetic agents, like sedatives, are central nervous system depressants which in combination may have an additive effect. Young children should be given minimal doses of each agent.

Changes in sensorium such as excitation, disorientation or drowsiness may be early indications of a high blood level of the drug and may occur following inadvertent intravascular administration or rapid absorption of mepivacaine.

Local anesthetic procedures should be used with caution when there is inflammation and/orsepsisin the region of the proposed injection.

Carcinogenesis, Mutagenesis, Impairment Of Fertility

Studies of mepivacaine HCl in animals to evaluate thecarcinogenicand mutagenic potential or the effect on fertility have not been conducted.

Pregnancy

Teratogenic Effects

Pregnancy Category C: Animal reproduction studies have not been conducted with this solution. It is also not known whether this solution can cause fetal harm when administered to a pregnant woman or can affect reproductive capacity. This solution should be given to a pregnant woman only if clearly needed.

Nursing Mothers

It is not known whether this drug is excreted in human milk. Because many drugs are excreted in human milk, caution should be exercised when this solution is administered to a nursing woman.

Pediatric Use

Great care must be exercised in adhering to safe concentrations and dosages for pedodontic administration (seeDOSAGE AND ADMINISTRATION).

OVERDOSE

Treatment of a patient with toxic manifestations consists of assuring and maintaining apatentairway and supportingventilation(respiration) as required. This usually will be sufficient in the management of most reactions. Should aconvulsionpersist despite ventilatory therapy, small increments of anticonvulsive agents may be given intravenously, such as benzodiazephine (e.g., diazepam) or ultrashort-acting barbiturates (e.g., thiopental or thiamylal) or short-acting barbiturates (e.g., pentobarbital or secobarbital). Cardiovascular depression may requirecirculatoryassistance with intravenous fluids and/or vasopressor (e.g., Ephedrine) as dictated by the clinical situation. Allergic reactions should be managed by conventional means.

Intravenous and subcutaneous LD50's in mice for mepivacaine hydrochloride 3% are 33 and 258 mg/kg, respectively. The acute IV and SC LD50's in mice for mepivacaine hydrochloride 2% with levonordefrin 1:20,000 are 30 and 184 mg/kg, respectively.

CONTRAINDICATIONS

Polocaine® is contraindicated in patients with a known hypersensitivity to amide-type local anesthetics.

CLINICAL PHARMACOLOGY

Polocaine® stabilizes the neuronal membrane and prevents the initiation and transmission of nerve impulses, thereby effecting local anesthesia.

Polocaine® is rapidly metabolized, with only a small percentage of the anesthetic (5 to 10 percent)being excreted unchanged in the urine. Polocaine® because of its amide structure, is not detoxified by the circulating plasma esterases. The liver is the principal site ofmetabolism, with over 50 percent of the administered dose being excreted into thebileas metabolites. Most of the metabolized mepivacaine is probably resorbed in the intestine and then excreted into the urine since only a small percentage is found in the feces. The principal route of excretion is via the kidney. Most of the anesthetic and its metabolites are eliminated within 30 hours. It has been shown that hydroxylation and N-demethylation, which are detoxification reactions, play important roles in the metabolism of the anesthetic. Three metabolites of mepivacaine have been identified from adult humans: two phenols, which are excreted almost exclusively as their glucuronide conjugates, and the N-demethylated compound (2', 6' - pipecoloxylidide).

The onset of action is rapid (30 to 120 seconds in the upper jaw; 1 to 4 minutes in the lower jaw) and 3% Polocaine® DENTAL will ordinarily provide operating anesthesia of20 minutesin theupper jawand40 minutesin thelower jaw.

2% Polocaine® DENTAL with Levonordefrin 1:20,000 provides anesthesia of longer duration for more prolonged procedures,1 hour to 2.5 hoursin theupper jawand2.5 hours to 5.5 hoursin thelower jaw.

Polocaine® does not ordinarily produce irritation or tissue damage.

Levonordefrin拟交感神经胺used as a vasoconstrictor in local anesthetic solutions. It has pharmacologic activity similar to that of Epinephrine but it is more stable than Epinephrine.

In equal concentrations, Levonordefrin is less potent than Epinephrine in raising blood pressure, and as a vasoconstrictor.

PATIENT INFORMATION

The patient should be cautioned against loss of sensation and possibility of bitingtraumashould the patient attempt to eat or chew gum prior to return of sensation.