Orabloc

1 INDICATIONS AND USAGE ORABLOC is indicated for local, infiltrative, or conductive anesthesia in both simple and complex dental procedures in adults and pediatric patients 4 years of age and older. ORABLOC is a combination of articaine HCl, an amide local anesthetic, and epinephrine, a vasoconstrictor, indicated for local, infiltrative, or conductive anesthesia in both simple and complex dental procedures in adults and pediatric patients 4 years of age and older ( 1 ).

2 DOSAGE AND ADMINISTRATION For dental procedures by intraoral submucosal infiltration or nerve block ( 2.1 ): For infiltration: 0.5 mL-2.5 mL (20 mg-100 mg articaine HCl) ( 2.1 ) For nerve block: 0.5 mL-3.4 mL (20 mg-136 mg articaine HCl) ( 2.1 ) For oral surgery: 1 ml-5.1 mL (40 mg-204 mg articaine HCl) ( 2.1 ) For most routine dental procedures, ORABLOC containing epinephrine 1:200,000 is preferred. However, when more pronounced homeostasis or improved visualization of the surgical field are required, ORABLOC containing epinephrine 1:100,000 may be used. ( 2.1 ) Maximum recommended dosages ( 2.2 ): Healthy adults: 7 mg/kg of articaine HCl and 0.0017mg/kg of epinephrine (equivalent to 0.175 mL/kg for either product presentation, articaine HCl and epinephrine 1:100,000 or 1:200,000) Pediatric patients 4-16 years: 7 mg/kg of articaine HCl and 0.0017mg/kg of epinephrine (equivalent to 0.175 mL/kg for either product presentation, articaine HCl and epinephrine 1:100,000 or 1:200,000) 2.1 General Dosing Information Table 1 summarizes the recommended dosages of ORABLOC administered by intraoral submucosal infiltration or nerve block for various types of anesthetic dental procedures in healthy adults and pediatric patients. Table 1: Recommended Dosages for Both Strengths Procedure Orabloc Injection Volume (mL) Total dose of articaine HCl (mg) Infiltration 0.5 mL to 2.5 mL 20 mg to 100 mg Nerve block 0.5 mL to 3.4 mL 20 mg to 136 mg Oral surgery 1 mL to 5.1 mL 40 mg to 204 mg The recommended dosages of ORABLOC in healthy adults serve only as a guide to the amount of anesthetic required for most routine dental procedures. The dosage to be used in adults depend on several factors such as type and extent of surgical procedure, depth of anesthesia, degree of muscular relaxation, and condition of the patient. In all cases, administer the lowest dosage that will produce the desired result. The dosages of ORABLOC to be used in pediatric patients aged 4 to 16 years old are determined by the age and weight of the patient and the type of dental procedure. For most routine dental procedures, ORABLOC containing epinephrine 1:200,000 is preferred. However, when more pronounced hemostasis or improved visualization of the surgical field are required, ORABLOC containing epinephrine 1:100,000 may be used. The onset of anesthesia and the duration of anesthesia are proportional to the dosage of the local anesthetic used. Exercise caution when employing large volumes because the incidence of adverse reactions may be dose-related. 2.2 Maximum Recommended Dosages Healthy Adults : The maximum dosage of ORABLOC is 7 mg/kg of articaine and 0.0017mg/kg of epinephrine (equivalent to 0.175 mL/kg for either product presentation, articaine HCl and 1:100,000 or 1:200,000 epinephrine). Pediatric Patients Ages 4 to 16 Years : The maximum dosage of ORABLOC is 7 mg/kg of articaine and 0.0017mg/kg of epinephrine (equivalent to 0.175 mL/kg for either product presentation, articaine HCl and 1:100,000 or 1:200,000 epinephrine) [see Use in Specific Populations ( 8.4 )]. 2.3 Dosing in Special Populations Lower dosages or dosage reduction may be required in debilitated patients, acutely ill patients, elderly patients, and pediatric patients commensurate with their age and physical condition. No studies have been performed in patients with renal or liver impairment. Exercise caution when using ORABLOC in patients with severe liver disease. [see Warnings and Precautions ( 5.2 ), Use in Specific Populations ( 8.4 , 8.5 , and 8.6 )] 2.4 Important Administration Instructions Visually inspect ORABLOC for particulate matter and discoloration prior to administration. ORABLOC (articaine HCl and epinephrine) Injection is available in glass cartridges. Prior to using the glass cartridges, disinfect by wiping the cap thoroughly with USP isopropyl alcohol (70%). Avoid use of isopropyl alcohol, as well as solutions of ethyl alcohol that are not of USP grade because they may contain denaturants that are injurious to rubber. Immersion is not recommended.

4 CONTRAINDICATIONS ORABLOC is contraindicated in patients who are hypersensitive to products containing sulfites. Products containing sulfites may cause allergic-type reactions including anaphylactic symptoms and life-threatening or less severe asthmatic episodes in certain susceptible people. Sulfite sensitivity is seen more frequently in asthmatic than in non-asthmatic people [see Warnings and Precautions ( 5.5 )] . Known hypersensitivity to sulfite ( 4 )

5 WARNINGS AND PRECAUTIONS Accidental Intravascular Injection: May be associated with convulsions followed by coma and respiratory arrest. Resuscitative equipment, oxygen and other resuscitative drugs should be available. ( 5.1 ) Systemic Toxicity: Systemic absorption of ORABLOC can produce effects on the central nervous and cardiovascular systems. ( 5.2 ) Vasoconstrictor Toxicity : Local anesthetic solutions like ORABLOC that contain a vasoconstrictor should be used cautiously, especially in patients with impaired cardiovascular function or vascular disease. ( 5.3 ) Methemoglobinemia: Cases of methemoglobinemia have been reported in association with local anesthetic use. ( 5.4 ) 5.1 Accidental Intravascular Injection Accidental intravascular injection of ORABLOC may be associated with convulsions, followed by central nervous system or cardiorespiratory depression and coma, progressing ultimately to respiratory arrest. Dental practitioners who employ local anesthetic agents including ORABLOC should be well versed in diagnosis and management of emergencies that may arise from their use. Resuscitative equipment, oxygen, and other resuscitative drugs should be available for immediate use. To avoid intravascular injection, aspiration should be performed before ORABLOC is injected. The needle must be repositioned until no return of blood can be elicited by aspiration. Note, however, that the absence of blood in the syringe does not guarantee that intravascular injection has been avoided. Small doses of local anesthetics injected in dental blocks may produce adverse reactions similar to systemic toxicity seen with unintentional intravascular injections of larger doses. Confusion, convulsions, respiratory depression and/or respiratory arrest, and cardiovascular stimulation or depression have been reported. These reactions may be due to intra-arterial injection of the local anesthetic with retrograde flow to the cerebral circulation. Patients receiving these blocks should be observed constantly. Resuscitative equipment and personnel for treating adverse reactions should be immediately available. Dosage recommendations should not be exceeded [see Dosage and Administration ( 2.1 )] . 5.2 Systemic Toxicity This includes toxicity arising from accidental intravascular injection of ORABLOC discussed in Section 5.1, as well as that related to higher systemic concentrations of local anesthetics or epinephrine [see Warnings and Precautions ( 5.3 )] . Systemic absorption of local anesthetics including ORABLOC can produce effects on the central nervous and cardiovascular systems. At blood concentrations achieved with therapeutic doses of ORABLOC, changes in cardiac conduction, excitability, refractoriness, contractility, and peripheral vascular resistance are minimal. However, toxic blood concentrations of ORABLOC can depress cardiac conduction and excitability, which may lead to atrioventricular block, ventricular arrhythmias, and cardiac arrest, possibly resulting in fatalities. In addition, myocardial contractility is depressed and peripheral vasodilatation occurs, leading to decreased cardiac output and arterial blood pressure. ORABLOC should also be used with caution in patients with heart block as well as those with impaired cardiovascular function since they may be less able to compensate for functional changes associated with the prolongation of A-V conduction produced by these drugs. Restlessness, anxiety, tinnitus, dizziness, blurred vision, tremors, depression, or drowsiness may be early warning signs of central nervous system toxicity. Careful and constant monitoring of cardiovascular and respiratory (adequacy of ventilation) vital signs and the patient’s state of consciousness should be performed after each local anesthetic injection of ORABLOC. Repeated doses of ORABLOC may cause significant increases in blood levels because of possible accumulation of the drug or its metabolites. The lowest dosage that results in effective anesthesia should be used to decrease the risk of high plasma levels and serious adverse effects. Tolerance to elevated blood levels varies with the status of the patient. Resuscitative equipment, oxygen, and other resuscitative drugs should be available for immediate use. Precautions for epinephrine administration, discussed in Section 5.3 should be observed. Debilitated patients, elderly patients, acutely ill patients, and pediatric patients should be given reduced doses commensurate with their age and physical condition [see Dosage and Administration ( 2.1 , 2.3 )] . No studies have been performed in patients with liver dysfunction, and caution should be used in patients with severe hepatic disease. 5.3 Vasoconstrictor Toxicity ORABLOC contains epinephrine, a vasoconstrictor that can cause local or systemic toxicity and should be used cautiously. Local toxicity may include ischemic injury or necrosis, which may be related to vascular spasm. ORABLOC should be used with caution in patients during or following the administration of potent general anesthetic agents, since cardiac arrhythmias may occur under such conditions. Patients with peripheral vascular disease and those with hypertensive vascular disease may exhibit exaggerated vasoconstrictor response. The American Heart Association has made the following recommendation regarding the use of local anesthetics with vasoconstrictors in patients with ischemic heart 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 the analgesia rendered 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, 1986). It is essential to aspirate before any injection to avoid administration of the drug into the blood stream. 5.4 Methemoglobinemia Cases of methemoglobinemia have been reported in association with local anesthetic use. Although all patients are at risk for methemoglobinemia, patients with glucose-6-phosphate dehydrogenase deficiency, congenital or idiopathic methemoglobinemia, cardiac or pulmonary compromise, infants under 6 months of age, and concurrent exposure to oxidizing agents or their metabolites are more susceptible to developing clinical manifestations of the condition. If local anesthetics must be used in these patients, close monitoring for symptoms and signs of methemoglobinemia is recommended. Signs of methemoglobinemia may occur immediately or may be delayed some hours after exposure, and are characterized by a cyanotic skin discoloration and/or abnormal coloration of the blood. Methemoglobin levels may continue to rise; therefore, immediate treatment is required to avert more serious central nervous system and cardiovascular adverse effects, including seizures, coma, arrhythmias, and death. Discontinue ORABLOC and any other oxidizing agents. Depending on the severity of the signs and symptoms, patients may respond to supportive care, i.e., oxygen therapy, hydration. A more severe clinical presentation may require treatment with methylene blue, exchange transfusion, or hyperbaric oxygen. 5.5 Anaphylaxis and Allergic-Type Reactions ORABLOC contains sodium metabisulfite, a sulfite that may cause allergic-type reactions including anaphylactic symptoms and life-threatening or less severe asthmatic episodes in certain susceptible people. The overall prevalence of sulfite sensitivity in the general population is unknown. Sulfite sensitivity is seen more frequently in asthmatic than in non-asthmatic people.

7 DRUG INTERACTIONS The administration of local anesthetic solutions containing epinephrine to patients receiving monoamine oxidase inhibitors, nonselective beta-adrenergic antagonists or tricyclic antidepressants may produce severe, prolonged hypertension. Phenothiazines and butyrophenones may reduce or reverse the pressor effect of epinephrine. Concurrent use of these agents should generally be avoided. In situations when concurrent therapy is necessary, careful patient monitoring is essential [see Warnings and Precautions ( 5.1 )] . Patients who are administered local anesthetics are at increased risk of developing methemoglobinemia when concurrently exposed to the following drugs, which could include other local anesthetics: Table 5: Examples of Drugs Associated with Methemoglobinemia: Class Examples Nitrates/Nitrites nitric oxide, nitroglycerin, nitroprusside, nitrous oxide Local anesthetics articaine, benzocaine, bupivacaine, lidocaine, mepivacaine, prilocaine, ropivacaine, procaine, tetracaine Antineoplastic agents cyclophosphamide, flutamide, hydroxyurea, ifosfamide, rasburicase Antibiotics dapsone, nitrofurantoin, para-aminosalicylic acid, sulfonamides Antimalarials chloroquine, primaquine Anticonvulsants phenobarbital, phenytoin, sodium valproate, Other drugs acetaminophen, metoclopramide, quinine, sulfasalazine Monoamine Oxidase Inhibitors, Nonselective Beta-adrenergic Antagonists, or Tricyclic Antidepressants : May produce severe, prolonged hypertension ( 7 ) Phenothiazines and butyrophenones : May reduce or reverse the pressor effect of epinephrine ( 7 )

6 ADVERSE REACTIONS Reactions to articaine are characteristic of those associated with other amide local anesthetics. Adverse reactions to this group of drugs may also result from excessive plasma levels (which may be due to overdosage, unintentional intravascular injection, or slow metabolic degradation), injection technique, volume of injection, or hypersensitivity or they may be idiosyncratic. The most common adverse reactions (incidence >2%) are headache and pain ( 6.1 ). To report SUSPECTED ADVERSE REACTIONS, contact Pierrel S.p.A. at 610-989-4213 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch. 6.1 Clinical Studies Experience Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed cannot be directly compared to rates in other clinical trials and may not reflect the rates observed in practice. The reported adverse events are derived from clinical trials in the United States and the United Kingdom with a similar product containing articaine and epinephrine. Table 2 displays the adverse events reported in clinical trials where 882 individuals were exposed to articaine containing epinephrine 1:100,000. Table 3 displays the adverse events reported in clinical trials where 182 individuals were exposed to articaine containing epinephrine 1:100,000 and 179 individuals were exposed to articaine containing epinephrine 1:200,000. Adverse reactions observed in at least 1% of patients: Table 2: Adverse Reactions in Controlled Trials with an Incidence of 1% or Greater in Patients Administered articaine containing epinephrine 1:100,000 Body System/Reaction articaine containing epinephrine 1:100,000 (N=882) Incidence Body as a whole Face edema 13 (1%) Headache 31 (4%) Infection 10 (1%) Pain 114 (13%) Digestive system Gingivitis 13 (1%) Nervous system Paresthesia 11 (1%) Table 3: Adverse Reactions in Controlled Trials with an Incidence of 1% or Greater in Patients Administered articaine containing epinephrine 1:200,000 and articaine containing epinephrine 1:100,000 Reaction articaine with epinephrine 1:200,000 (N=179) Incidence articaine with epinephrine 1:100,000 (N=182) Incidence Any adverse event 33 (18%) 35 (19%) Pain 11 (6.1%) 14 (7.6%) Headache 9 (5%) 6 (3.2%) Positive blood aspiration into syringe 3 (1.6%) 6 (3.2%) Swelling 3 (1.6%) 5 (2.7%) Trismus 1 (0.3%) 3 (1.6%) Nausea and emesis 3 (1.6%) 0 (0%) Sleepiness 2 (1.1%) 1 (0.5%) Numbness and tingling 1 (0.5%) 2 (1.%) Palpitation 0 (0%) 2 (1.%) Ear symptoms (earache, otitis media) 1 (0.5%) 2 (1.%) Cough, persistent cough 0 (0%) 2 (1.%) Adverse reactions observed in less than 1% of patients: Table 4: Adverse Reactions in Controlled Trials with an Incidence of Less than 1% but Considered Clinically Relevant Body System Events Body as a Whole Asthenia; back pain; injection site pain; burning sensation above injection site; malaise; neck pain Cardiovascular System Hemorrhage; migraine; syncope; tachycardia; elevated blood pressure Digestive System Dyspepsia; glossitis; gum hemorrhage; mouth ulceration; nausea; stomatitis; tongue edemas; tooth disorder; vomiting Hemic and Lymphatic System Ecchymosis; lymphadenopathy Metabolic and Nutritional System Edema; thirst Musculoskeletal System Arthralgia; myalgia; osteomyelitis Nervous System Dizziness; dry mouth; facial paralysis; hyperesthesia; increased salivation; nervousness; neuropathy; paresthesia; somnolence; exacerbation of Kearns-Sayre Syndrome Respiratory System Pharyngitis; rhinitis; sinus pain; sinus congestion Skin and Appendages Pruritus; skin disorder Special Senses Ear pain; taste perversion 6.2 Postmarketing Experience The following adverse reactions have been identified during post-approval use of articaine hydrochloride with epinephrine. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure. Persistent paresthesias of the lips, tongue, and oral tissues have been reported with use of articaine hydrochloride, with slow, incomplete, or no recovery. These postmarketing events have been reported chiefly following nerve blocks in the mandible and have involved the trigeminal nerve and its branches. Hypoesthesia has been reported with use of articaine, especially in pediatric age groups, which is usually reversible. Prolonged numbness can result in soft tissue injuries such as that of the lips and tongue in these age groups. Ischemic injury and necrosis has been described following use of articaine with epinephrine and has been postulated to be due to vascular spasm of terminal arterial branches. Paralysis of ocular muscles has been reported, especially after posterior, superior alveolar injections of articaine during dental anesthesia. Symptoms include diplopia, mydriasis, ptosis and difficulty in abduction of the affected eye. These symptoms have been described as developing immediately after injection of the anesthetic solution and persisting one minute to several hours, with generally complete recovery.

8.1 Pregnancy Teratogenic Effects-Pregnancy Category C. There are no adequate and well-controlled studies in pregnant women with articaine with epinephrine. Articaine hydrochloride and epinephrine (1:100,000) has been shown to increase fetal deaths and skeletal variations in rabbits when given in doses approximately 4 times the maximum recommended human dose (MRHD). ORABLOC should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus. In embryo-fetal toxicity studies in rabbits, 80 mg/kg, subcutaneously (approximately 4 times the MRHD based on body surface area) caused fetal death and increased fetal skeletal variations, but these effects may be attributable to severe maternal toxicity, including seizures, observed at this dose. In contrast, no embryo-fetal toxicities were observed when articaine and epinephrine (1:100,000) was administered subcutaneously throughout organogenesis at doses up to 40 mg/kg in rabbits and 80 mg/kg in rats (approximately 2 times the MRHD based on body surface area). In pre- and postnatal developmental studies subcutaneous administration of articaine hydrochloride to pregnant rats throughout gestation and lactation, at a dose of 80 mg/kg (approximately 2 times the MRHD based on body surface area) increased the number of stillbirths and adversely affected passive avoidance, a measure of learning, in pups. This dose also produced severe maternal toxicity in some animals. A dose of 40 mg/kg (approximately equal to the MRHD on a mg/m2 basis) did not produce these effects. A similar study using articaine and epinephrine (1:100,000) rather than articaine hydrochloride alone produced maternal toxicity, but no effects on offspring.