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- Adenosine Phosphate
Excipient information presented when available (limited, particularly for generics); consult specific product labeling.
Adenocard: 6 mg/2 mL (2 mL); 12 mg/4 mL (4 mL)
Adenoscan: 3 mg/mL (20 mL, 30 mL)
Generic: 3 mg/mL (20 mL, 30 mL); 6 mg/2 mL (2 mL)
Solution, Intravenous [preservative free]:
Generic: 3 mg/mL (20 mL, 30 mL); 6 mg/2 mL (2 mL); 12 mg/4 mL (4 mL)
Brand Names: U.S.
- Antiarrhythmic Agent, Miscellaneous
- Diagnostic Agent
Antiarrhythmic actions: Slows conduction time through the AV node, interrupting the re-entry pathways through the AV node, restoring normal sinus rhythm
Myocardial perfusion scintigraphy: Adenosine also causes coronary vasodilation and increases blood flow in normal coronary arteries with little to no increase in stenotic coronary arteries; thallium-201 uptake into the stenotic coronary arteries will be less than that of normal coronary arteries revealing areas of insufficient blood flow.
Removed from systemic circulation primarily by vascular endothelial cells and erythrocytes (by cellular uptake); rapidly metabolized intracellularly; phosphorylated by adenosine kinase to adenosine monophosphate (AMP) which is then incorporated into high-energy pool; intracellular adenosine is also deaminated by adenosine deaminase to inosine; inosine can be metabolized to hypoxanthine, then xanthine and finally to uric acid.
Onset of Action
Duration of Action
Use: Labeled Indications
Paroxysmal supraventricular tachycardia: Adenocard: Treatment of paroxysmal supraventricular tachycardia (PSVT) including that associated with accessory bypass tracts (Wolff-Parkinson-White syndrome); when clinically advisable, appropriate vagal maneuvers should be attempted prior to adenosine administration; not effective for conversion of atrial fibrillation, atrial flutter, or ventricular tachycardia
Note: While adenosine will not convert atrial fibrillation or atrial flutter, the transient AV-nodal block may aid in the identification of the arrhythmia by exposing the underlying atrial fibrillation or flutter electrocardiographic morphology.
Guideline recommendations: The American College of Cardiology/American Heart Association/Heart Rhythm Society supraventricular tachycardia (SVT) guidelines recommends adenosine in the acute management of a variety of SVTs (eg, AV nodal reentrant tachycardia [AVNRT], AV reentrant tachycardia [AVRT]) (ACC/AHA/HRS [Page 2015]).
Diagnostic aid: Adenoscan: Pharmacologic stress agent used in myocardial perfusion thallium-201 scintigraphy
Off Label Uses
Monomorphic wide-complex tachycardia (stable)
Data from a multicenter, retrospective, observational study suggests that adenosine may be beneficial in the therapeutic and diagnostic maneuver of stable regular monomorphic, wide-complex tachycardia [Marill 2009]. Additional data may be necessary to further define the role of adenosine in the management of this condition.
Based on the American Heart Association Adult Advanced Cardiovascular Life Support and the Pediatric Advanced Life Support guidelines, adenosine given for the management of stable regular monomorphic, wide-complex tachycardias as a therapeutic (if supraventricular tachycardia [SVT]) and diagnostic maneuver is effective and recommended in this condition.
Narrow-complex regular tachycardia (stable)
Data from a randomized, double blind, controlled study supports the use of adenosine in the treatment of stable, narrow-complex regular tachycardias [Dimarco 1990]. Data from a prospective, uncontrolled, unblinded, pre-hospital study also supports the use of adenosine in the treatment of stable, narrow-complex regular tachycardias [Furlong 1995]. Additional trials may be necessary to further define the role of adenosine for this condition.
Based on the American Heart Association Adult Advanced Cardiovascular Life Support and the Pediatric Advanced Life Support guidelines, adenosine given for stable, narrow-complex regular tachycardias that do not respond to vagal maneuvers is effective and recommended in the management of this condition.
Narrow-complex regular tachycardia (unstable)
Based on the American Heart Association Adult Advanced Cardiovascular Life Support and the Pediatric Advanced Life Support guidelines, adenosine given for unstable narrow-complex regular tachycardias while preparations are made for synchronized direct-current cardioversion is effective and recommended in the management of this condition.
Pulmonary artery hypertension (acute vasodilator testing)
Based on the American College of Cardiology Foundation/American Heart Association (ACCF/AHA) expert consensus document on pulmonary hypertension and the 5th World Symposium on Pulmonary Hypertension (WSPH) updated treatment algorithm of pulmonary arterial hypertension, adenosine (Adenoscan) given for acute vasodilator testing in pulmonary artery hypertension is an effective and acceptable alternative agent (inhaled nitric oxide is the gold standard).
Hypersensitivity to adenosine or any component of the formulation; second- or third-degree AV block, sick sinus syndrome, or symptomatic bradycardia (except in patients with a functioning artificial pacemaker); known or suspected bronchoconstrictive or bronchospastic lung disease (Adenoscan), asthma (ACLS [Neumar, 2010]; Adenoscan prescribing information, 2014)
Paroxysmal supraventricular tachycardia (Adenocard): IV (rapid, over 1 to 2 seconds, via peripheral line; see Note): Initial: 6 mg; if not effective within 1 to 2 minutes, 12 mg may be given; may repeat 12 mg bolus if needed (maximum single dose: 12 mg). Follow each dose with 20 mL normal saline flush. Note: Initial dose of adenosine should be reduced to 3 mg if patient is currently receiving carbamazepine or dipyridamole, has a transplanted heart or if adenosine is administered via central line (ACLS 2010; Chang 2002). A subsequent bolus dose of 18 mg (following an initial dose of 6 mg and a repeat bolus dose of 12 mg) has reportedly been used in patients with sustained SVTs (ACC/AHA/HRS [Page 2015]; Domanovits 1994).
Pharmacologic stress testing (Adenoscan): IV: Continuous IV infusion via peripheral line: 140 mcg/kg/minute for 6 minutes using syringe or volumetric infusion pump; total dose: 840 mcg/kg. Thallium-201 is injected at midpoint (3 minutes) of infusion.
Acute vasodilator testing in pulmonary artery hypertension (off-label use) (Adenoscan): IV: Initial: 50 mcg/kg/minute increased by 50 mcg/kg/minute every 2 minutes to a maximum dose of 500 mcg/kg/minute (Schrader, 1992) or to a maximum dose of 350 mcg/kg/minute (ACCF/AHA [McLaughlin, 2009]; ESC/ERS/ISHLT [Galie 2009]; Zuo 2012); acutely assess vasodilator response
Refer to adult dosing. Elderly may be more sensitive to effects of adenosine.
Rapid IV push (over 1 to 2 seconds) via peripheral line, followed by a normal saline flush:
Paroxysmal supraventricular tachycardia (Adenocard): Infants and Children: IV:
Children <50 kg: Initial: 0.05 to 0.1 mg/kg (maximum initial dose: 6 mg). If conversion of PSVT does not occur within 1 to 2 minutes, may increase dose by 0.05 to 0.1 mg/kg. May repeat until sinus rhythm is established or to a maximum single dose of 0.3 mg/kg or 12 mg. Follow each dose with normal saline flush.
Children ≥50 kg: Refer to adult dosing.
Pediatric advanced life support (PALS, 2010): Treatment of SVT: IV, I.O.: Initial: 0.1 mg/kg (maximum initial dose: 6 mg); if not effective within 1 to 2 minutes, administer 0.2 mg/kg (maximum single dose: 12 mg). Follow each dose with ≥5 mL normal saline flush.
Dosing: Renal Impairment
There are no dosage adjustments provided in the manufacturer's labeling. However, adenosine is not renally eliminated.
Dosing: Hepatic Impairment
There are no dosage adjustments provided in the manufacturer's labeling. However, adenosine is not hepatically eliminated.
Doses ≥0.6 mg: Give undiluted.
Doses <0.6 mg: Further dilution of dose may be necessary to ensure complete and accurate administration; dilution with NS to a final concentration of 0.3 to 1 mg/mL has been used; to prepare a 0.3 mg/mL solution, add 3 mg of adenosine (1 mL) to 9 mL of NS; to prepare a 1 mg/mL, add 3 mg of adenosine (1 mL) to 2 mL of NS.
Adenocard: For rapid bolus IV use only; administer IV push over 1 to 2 seconds at a peripheral IV site as proximal as possible to trunk (not in lower arm, hand, lower leg, or foot); follow each bolus with a rapid normal saline flush (infants and children ≥5 mL; adults 20 mL). Use of 2 syringes (one with adenosine dose and the other with NS flush) connected to a T-connector or stopcock is recommended. If administered via central line in adults, reduce initial dose to 3 mg (ACLS 2010; Chang 2002).
Adenoscan: For IV infusion only via peripheral line
Avoid dietary caffeine for at least 12 hours prior to pharmacologic stress testing.
Store between 15°C and 30°C (59°F and 86°F). Do not refrigerate; crystallization may occur (may dissolve by warming to room temperature).
Caffeine and Caffeine Containing Products: May diminish the therapeutic effect of Adenosine. Management: Monitor for decreased effect of adenosine if patient is receiving caffeine. Discontinue caffeine in advance of scheduled diagnostic use of adenosine whenever possible. Consider therapy modification
CarBAMazepine: May enhance the adverse/toxic effect of Adenosine. Specifically, the risk of higher degree heart block may be increased. Management: Consider using a lower initial dose of adenosine in patients who are receiving carbamazepine. Consider therapy modification
Digoxin: May enhance the adverse/toxic effect of Adenosine. Monitor therapy
Dipyridamole: May enhance the adverse/toxic effect of Adenosine. Specifically, cardiovascular effects of adenosine may be enhanced. Adenosine dose reduction may be needed. Management: Reduction of the initial dose of adenosine may be warranted. Consider therapy modification
Nicotine: May enhance the AV-blocking effect of Adenosine. Nicotine may enhance the tachycardic effect of Adenosine. Monitor therapy
Theophylline Derivatives: May diminish the therapeutic effect of Adenosine. Consider therapy modification
Note: Frequency varies based on use and is not always defined; higher frequency of infusion-related effects, such as flushing and lightheadedness/dizziness, were reported with continuous infusion (Adenoscan).
Cardiovascular: Cardiac arrhythmia (transient and new arrhythmia after cardioversion; eg, atrial premature contractions, atrial fibrillation, premature ventricular contractions; 55%), chest pressure (and discomfort; 7% to 40%)
Central nervous system: Headache (2% to 18%), dizziness (≤12%)
Dermatologic: Facial flushing (18% to 44%)
Gastrointestinal: Gastrointestinal distress (13%)
Neuromuscular & skeletal: Neck discomfort (includes throat, jaw; <1% to 15%)
Respiratory: Dyspnea (12% to 28%)
1% to 10%:
Cardiovascular: Atrioventricular block (infusion 6%; third-degree <1%), depression of ST segment on ECG (3%), hypotension (<1% to 2%), chest pain, palpitations
Central nervous system: Nervousness (2%), paresthesia (≤2%), numbness (1%), apprehension
Gastrointestinal: Nausea (3%)
Neuromuscular & skeletal: Upper extremity discomfort (≤4%)
<1% (Limited to important or life-threatening): Atrial fibrillation, blurred vision, bradycardia, bronchospasm, cardiac arrest, increased intracranial pressure, injection site reaction, myocardial infarction, respiratory arrest, torsades de pointes, transient hypertension, ventricular arrhythmia, ventricular fibrillation, ventricular tachycardia
Concerns related to adverse effects:
• Atrial fibrillation/flutter: There have been reports of atrial fibrillation/flutter when administered to patients with paroxysmal supraventricular tachycardia (PSVT) and may be especially problematic in patients with PSVT and underlying Wolff-Parkinson-White syndrome; has also been reported in patients with or without a history of atrial fibrillation undergoing myocardial perfusion imaging with adenosine infusion.
• Cardiovascular events (Adenoscan): Cardiac arrest (fatal and nonfatal), myocardial infarction (MI), cerebrovascular accident (hemorrhagic and ischemic), and sustained ventricular tachycardia (requiring resuscitation) have occurred following Adenoscan use. Avoid use in patients with signs or symptoms of unstable angina, acute myocardial ischemia, or cardiovascular instability due to possible increased risk of significant cardiovascular consequences. Appropriate measures for resuscitation should be available during use.
• Conduction disturbances: Adenosine decreases conduction through the AV node and may produce first-, second-, or third-degree heart block. Patients with preexisting SA nodal dysfunction may experience prolonged sinus pauses after adenosine; use caution in patients with first-degree AV block or bundle branch block; use is contraindicated in patients with high-grade AV block, sinus node dysfunction, or symptomatic bradycardia (unless a functional artificial pacemaker is in place). Rare, prolonged episodes of asystole have been reported, with fatal outcomes in some cases. Discontinue adenosine in any patient who develops persistent or symptomatic high-grade AV block.
• Hypersensitivity: Hypersensitivity reactions (including dyspnea, pharyngeal edema, erythema, flushing, rash, or chest discomfort) have been reported following Adenoscan administration.
• Hypertension: Systolic and diastolic pressure increases have been observed with Adenoscan infusion. In most instances, blood pressure increases resolved spontaneously within several minutes; occasionally, hypertension lasted for several hours.
• Hypotension: May produce profound vasodilation with subsequent hypotension. When used as a bolus dose (PSVT), effects are generally self-limiting (due to the short half-life of adenosine). However, when used as a continuous infusion (pharmacologic stress testing), effects may be more pronounced and persistent, corresponding to continued exposure. Use infusions with caution in patients with autonomic dysfunction, carotid stenosis (with cerebrovascular insufficiency), hypovolemia, pericarditis, pleural effusion and/or stenotic valvular heart disease; discontinue infusion in patients who develop persistent or symptomatic hypotension.
• Proarrhythmic effects: Monitor for proarrhythmic effects (eg, polymorphic ventricular tachycardia) during and shortly after administration/termination of arrhythmia. The benign transient occurrence of atrial and ventricular ectopy is common upon termination of arrhythmia.
• Seizures: Seizures (new-onset or recurrent) have been reported following Adenoscan administration; risk may be increased with concurrent use of aminophylline. Use of any methylxanthine (eg aminophylline, caffeine, theophylline) is not recommended in patients experiencing seizures associated with Adenoscan administration.
• Arrhythmia (wide-complex tachycardia): Avoid use in irregular or polymorphic wide-complex tachycardias; may cause degeneration to ventricular fibrillation (ACLS, 2010).
• Electrolyte imbalance: Correct electrolyte disturbances, especially hypokalemia or hypomagnesemia, prior to use and throughout therapy.
• Heart transplant recipients: Use with extreme caution in heart transplant recipients; adenosine may cause prolonged asystole; reduction of initial adenosine dose is recommended (ACLS, 2010); considered by some to be contraindicated in this setting (Delacrétaz, 2006).
• Pulmonary artery hypertension: Acute vasodilator testing (not an approved use): Use with extreme caution in patients with concomitant heart failure (LV systolic dysfunction with significantly elevated left heart filling pressures) or pulmonary veno-occlusive disease/pulmonary capillary hemangiomatosis; significant decompensation has occurred with other highly selective pulmonary vasodilators resulting in acute pulmonary edema.
• Respiratory disease: Avoid use in patients with bronchoconstriction or bronchospasm (eg, asthma); dyspnea, bronchoconstriction, and respiratory compromise have occurred during use. Per the ACLS guidelines and the manufacturer of Adenoscan, use considered contraindicated in patients with asthma. Use caution in patients with obstructive lung disease not associated with bronchoconstriction (eg, emphysema, bronchitis). Immediately discontinue therapy if severe respiratory difficulty is observed. Appropriate measures for resuscitation should be available during use.
• Wolff-Parkinson-White (WPW) syndrome: Adenosine should not be used in patients with WPW syndrome and preexcited atrial fibrillation/flutter since ventricular fibrillation may result (AHA/ACC/HRS [January, 2014]).
Concurrent drug therapy issues:
• Drug-drug interactions: Potentially significant interactions may exist, requiring dose or frequency adjustment, additional monitoring, and/or selection of alternative therapy. Consult drug interactions database for more detailed information.
• Caffeine: Pharmacologic stress testing: Since caffeine antagonizes the activity of adenosine, withhold for 5 half-lives prior to adenosine use; avoid dietary caffeine for at least 12 hours prior to pharmacologic stress testing (Henzlova, 2006).
• Carbamazepine: Concomitant use potentiates the effects of adenosine; reduction of initial adenosine dose is recommended when used for SVT (ACLS, 2010).
• Dipyridamole: Concomitant use potentiates the effects of adenosine; reduction of initial adenosine dose is recommended when used for SVT (ACLS, 2010); withhold dipyridamole-containing medications for at least 24 hours prior to pharmacologic stress testing (Henzlova, 2006)
• Drugs which slow AV node conduction: Use with caution in patients receiving other drugs which slow AV node conduction (eg, digoxin, verapamil).
• Theophylline (includes aminophylline): Pharmacologic stress testing: Since theophylline antagonizes the activity of adenosine, withhold for 5 half-lives prior to adenosine use whenever possible.
• Elderly: Use with caution in the elderly; may be at increased risk of hemodynamic effects, bradycardia, and/or AV block.
Dosage form specific issues:
• Adenocard: Transient AV block is expected. When used in PSVT, at the time of conversion to normal sinus rhythm, a variety of new rhythms may appear on the ECG. Administer as a rapid bolus, either directly into a vein or (if administered into an IV line), as close to the patient as possible (followed by saline flush). Dose reduction recommended when administered via central line (ACLS, 2010).
• Appropriate use: ECG monitoring is required during use. Equipment for resuscitation and trained personnel experienced in handling medical emergencies should always be immediately available. Adenosine does not convert atrial fibrillation/flutter to normal sinus rhythm; however, may be used diagnostically in these settings if the underlying rhythm is not apparent.
ECG, heart rate, blood pressure; consult individual institutional policies and procedures
Pregnancy Risk Factor
Animal reproduction studies have not been conducted. Adenosine is an endogenous substance and adverse fetal effects would not be anticipated. Adenosine is recommended for the acute treatment of SVT in pregnant women. The usual recommended doses may be used, although higher doses may be needed in some cases (Page [ACC/AHA/HRS 2015]). ACLS guidelines suggest use is safe and effective in pregnancy (ACLS [Neumar 2010]).
• Discuss specific use of drug and side effects with patient as it relates to treatment. (HCAHPS: During this hospital stay, were you given any medicine that you had not taken before? Before giving you any new medicine, how often did hospital staff tell you what the medicine was for? How often did hospital staff describe possible side effects in a way you could understand?)
• Patient may experience abdominal pain or flushing. Have patient report immediately to prescriber signs of severe cerebrovascular disease (change in strength on one side is greater than the other, difficulty speaking or thinking, change in balance, or vision changes), vision changes, shortness of breath, angina, severe dizziness, passing out, tachycardia, bradycardia, abnormal heartbeat, seizures, severe headache, neck pain, jaw pain, or throat pain (HCAHPS).
• Educate patient about signs of a significant reaction (eg, wheezing; chest tightness; fever; itching; bad cough; blue skin color; seizures; or swelling of face, lips, tongue, or throat). Note: This is not a comprehensive list of all side effects. Patient should consult prescriber for additional questions.
Intended Use and Disclaimer: Should not be printed and given to patients. This information is intended to serve as a concise initial reference for healthcare professionals to use when discussing medications with a patient. You must ultimately rely on your own discretion, experience and judgment in diagnosing, treating and advising patients.
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