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Atropine is indicated for the treatment of poisoning by susceptible organophosphorus nerve agents having anticholinesterase activity as well as organophosphorus or carbamate insecticides in adults and pediatric patients weighing more than 41 kg (90 pounds). Atropine, a cholinergic muscarinic antagonist, is indicated for the treatment of poisoning by susceptible organophosphorus nerve agents having anticholinesterase activity as well as organophosphorus or carbamate insecticides in adults and pediatric patients weighing more than 41 kg (90 pounds) (1).

Important Administration Information Three (3) Atropine autoinjectors should be available for use in each patient at risk for nerve agent or organophosphate insecticide poisoning; one (1) for mild symptoms plus two (2) more for severe symptoms [see Dosage and Administration (2.2)]. Only administer Atropine to patients experiencing symptoms of organophosphorus poisoning in a situation where exposure is known or suspected. The Atropine autoinjector is intended as an initial treatment of the muscarinic symptoms of insecticide or nerve agent poisonings as soon as symptoms appear; definitive medical care should be sought immediately. In general, atropine should not be used until cyanosis has been overcome since atropine may produce ventricular fibrillation and possible seizures in the presence of hypoxia. The Atropine autoinjector should be used by persons who have had adequate training in the recognition and treatment of nerve agent or insecticide intoxication, but may be administered by a caregiver or by self-administration if a trained provider is not available. Close supervision of all treated patients is indicated for at least 48 to 72 hours. In severe poisonings, concurrent administration of an anticonvulsant (preferably a benzodiazepine) may be warranted if seizure is suspected in the unconscious individual because overt jerking may not be apparent because of the effects of the poison [see Drug Interactions (7.2)]. In poisonings caused by organophosphorous nerve agents and insecticides it may also be helpful to concurrently administer a cholinesterase reactivator such as pralidoxime chloride [see Drug Interactions (7.1)]. The injection site is the mid-lateral thigh area. The Atropine autoinjector can inject through clothing. However, make sure pockets at the injection site are empty. People who may not have a lot of fat at the injection site should also be injected in the mid-lateral thigh, but before giving the injection, bunch up the thigh to provide a thicker area for injection. Dosage Information Dosage for Mild Symptoms in Adults and Pediatric Patients Weighing More Than 41 kg (90 Pounds) First Dose: If the patient experiences two or more mild symptoms of nerve agent (nerve gas) or insecticide exposure listed in Table 1, administer one (1) Atropine injection intramuscularly into the mid-lateral outer thigh. Additional Doses: If, at any time after the first dose, the patient develops any of the severe symptoms listed in Table 1, administer two (2) additional Atropine injections intramuscularly in rapid succession. Wait 10 to 15 minutes for Atropine to take effect. If, after 10 to 15 minutes, the patient does not develop any of the severe symptoms listed in Table 1, no additional Atropine injections are recommended. If possible, a person other than the patient should administer the second and third 2 mg Atropine autoinjectors. Dosage for Severe Symptoms in Adults and Pediatric Patients Weighing More Than 41 kg (90 Pounds) If a patient is either unconscious or has any of the severe symptoms listed in Table 1, immediately administer three (3) Atropine injections intramuscularly into the patient’s mid-lateral outer thigh in rapid succession. Table 1: Common Signs/Symptoms of Organophosphorus and/or Carbamate Poisoning MILD symptoms include: Blurred vision or miosis Unexplained excessive lacrimation Unexplained excessive nasopharyngeal secretions Increased salivation Chest tightness, difficulty breathing, wheezing, or coughing Tremors throughout the body or muscular twitching Nausea, vomiting, abdominal cramping, or diarrhea Tachycardia or bradycardia SEVERE symptoms include: Altered mental status Loss of consciousness Respiratory distress Excessive secretions from the lungs/airway Severe muscular twitching, generalized weakness or paralysis Involuntary urination and/or defecation Convulsions or seizures Additional Care Instructions Environmental All patients should be evacuated immediately from the contaminated environment. …

Cardiovascular Risks Cardiovascular adverse reactions reported in the literature for atropine include, but are not limited to, sinus tachycardia, palpitations, premature ventricular contractions, atrial flutter, atrial fibrillation, ventricular flutter, ventricular fibrillation, cardiac syncope, asystole, and myocardial infarction [see Adverse Reactions (6)]. In patients with a recent myocardial infarction and/or severe coronary artery disease, there is a possibility that atropine-induced tachycardia may cause ischemia, extend or initiate myocardial infarcts, and stimulate ventricular ectopy and fibrillation. Atropine should be used with caution in patients with known cardiovascular disease or cardiac conduction problems. Heat Injury Atropine may inhibit sweating which, in a warm environment or with excessive exercise, can lead to hyperthermia and heat injury. To the extent feasible, avoid excessive exercise and heat exposure [see Adverse Reactions (6)]. Acute Glaucoma Atropine may cause acute glaucoma and should be administered with caution in patients at risk for acute glaucoma or who have severe narrow angle glaucoma. Monitor for signs and symptoms of intraocular pressure, as appropriate. Urinary Retention Atropine may cause urinary retention and should be administered with caution to patients with clinically significant bladder outflow obstruction. Pyloric Stenosis Atropine may cause complete pyloric obstruction in patients with partial pyloric stenosis. These patients should be monitored for gastrointestinal symptoms following administration of Atropine. Exacerbation of Chronic Lung Disease Atropine may cause thickening of bronchial secretions and formation of dangerous viscid plugs in individuals with chronic lung disease. Respiratory status should be monitored in individuals with chronic lung disease following administration of Atropine. Hypersensitivity Atropine can cause hypersensitivity reactions, including anaphylactic reactions [see Adverse Reactions (6)]. Medical supervision is necessary in patients who have had previous anaphylactic reactions to atropine and require treatment for organophosphorus or nerve agent poisoning. Cardiovascular (CV) Risks : Tachycardia, palpitations, premature ventricular contractions, flutter, fibrillation, etc. Use caution in patients with known CV disease or conduction problems. (5.1) Heat Injury: May inhibit sweating and lead to hyperthermia; avoid excessive exercising and heat exposure. (5.2) Acute Glaucoma : May precipitate in susceptible individuals. (5.3) Urinary Retention : Administer with caution in patient with bladder outflow obstruction. (5.4) Pyloric Stenosis : May convert into complete obstruction. (5.5) Exacerbation of Chronic Lung Disease : Atropine may cause inspiration of bronchial secretions and formation of dangerous viscid plugs in individuals with chronic lung disease; monitor respiratory status. (5.6) Hypersensitivity : Atropine may cause hypersensitivity reactions, including anaphylaxis (5.7)

None. None (4)

Pralidoxime When atropine and pralidoxime are used together, the signs of atropinization (flushing, mydriasis, tachycardia, dryness of the mouth and nose) may occur earlier than might be expected when atropine is used alone because pralidoxime may potentiate the effect of atropine. Excitement and manic behavior immediately following recovery of consciousness have been reported in several cases. However, similar behavior has occurred in cases of organophosphate poisoning that were not treated with pralidoxime. Barbiturates Barbiturates are potentiated by the anticholinesterases; therefore, barbiturates should be used cautiously in the treatment of convulsions resulting from exposure to Atropine. Pralidoxime : may potentiate the effect of atropine (7.1). Barbiturates : atropine may potentiate the effect of barbiturates (7.2) See 17 for PATIENT COUNSELING INFORMATION and FDA-approved patient labeling.

The following serious adverse reactions are described elsewhere in the labeling: Cardiovascular Risks [ see Warnings and Precautions ( 5.1) ] Heat Injury [ see Warnings and Precautions ( 5.2) ] Acute Glaucoma [ see Warnings and Precautions ( 5.3) ] Urinary Retention [ see Warnings and Precautions ( 5.4) ] Pyloric Stenosis [ see Warnings and Precautions ( 5.5) ] Exacerbation of Chronic Lung Disease [ see Warnings and Precautions ( 5.6) ] Hypersensitivity [ see Warnings and Precautions (5.7) ] The following adverse reactions associated with the use of atropine were identified in the literature. 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. Injection Site Reactions Mild to moderate pain may be experienced at the site of injection. Adverse Reactions at Recommended Dosages The major and most common side effects of atropine can be attributed to its antimuscarinic action. These include dryness of the mouth, blurred vision, dry eyes, photophobia, confusion, headache, dizziness, fatigue, tachycardia, palpitations, flushing, urinary hesitance or retention, constipation, abdominal pain, abdominal distention, nausea, vomiting, loss of libido, and impotency. Anhidrosis may produce heat intolerance and impairment of temperature regulation especially in a hot environment. Hypersensitivity Hypersensitivity reactions will occasionally occur with atropine; these are usually seen as skin rashes, on occasion progressing to exfoliation. Anaphylactic reactions have occurred. Additional Adverse Reactions to Atropine by Organ System The following adverse reactions were reported in published literature for atropine in both adults and pediatric patients: Cardiovascular : Sinus tachycardia, supraventricular tachycardia, junctional tachycardia, ventricular tachycardia, bradycardia, palpitations, ventricular arrhythmia, ventricular flutter, ventricular fibrillation, atrial arrhythmia, atrial fibrillation, atrial ectopic beats, ventricular premature contractions, bigeminal beats, trigeminal beats, nodal extrasystole, ventricular extrasystole, supraventricular extrasystole, asystole, cardiac syncope, prolongation of sinus node recovery time, cardiac dilation, left ventricular failure, myocardial infarction, intermittent nodal rhythm (no P wave), prolonged P wave, shortened PR segment, R on T phenomenon, shortened RT duration, widening and flattening of QRS complex, prolonged QT interval, flattening of T wave, repolarization abnormalities, altered ST-T waves, retrograde conduction, transient AV dissociation, increased blood pressure, decreased blood pressure, labile blood pressure, weak or impalpable peripheral pulses. Eye : Mydriasis, pupils poorly reactive to light, decreased contrast sensitivity, decreased visual acuity, decreased accommodation, cycloplegia, strabismus, heterophoria, cyclophoria, acute angle closure glaucoma, conjunctivitis, keratoconjunctivitis sicca, blindness, tearing, dry conjunctiva, irritated eyes, crusting of eyelid, blepharitis. Gastrointestinal : Paralytic ileus, decreased bowel sounds, delayed gastric emptying, decreased food absorption, dysphagia. General : Hyperpyrexia, lethargy, somnolence, chest pain, excessive thirst, weakness, syncope, insomnia, tongue chewing, dehydration, feeling hot. Special Investigations : Leukocytosis, hyponatremia, elevated BUN, elevated hemoglobin, elevated erythrocytes, low hemoglobin, hypoglycemia, hyperglycemia, hypokalemia, increase in photic stimulation on EEG, signs of drowsiness on EEG, runs of alpha waves on EEG, alpha waves (EEG) blocked upon opening eyes. Metabolic : Failure to feed. Central Nervous System : Ataxia, hallucinations (visual or aural), seizures (generally tonic-clonic), abnormal movements, coma, stupor, amnesia, diminished tendon reflexes, hyperreflexia, muscle twitching, opisthotnos, Babinski's reflex/Chaddock's reflex, …