When used for self-medication (OTC labeling): Children and teenagers who have or are recovering from chickenpox or flu-like symptoms should not use this product. Changes in behavior (along with nausea and vomiting) may be an early sign of Reye's syndrome; patients should be instructed to contact their healthcare provider if these occur.
Cardiovascular: Hypotension, tachycardia, dysrhythmias, edema
Central nervous system: Fatigue, insomnia, nervousness, agitation, confusion, dizziness, headache, lethargy, cerebral edema, hyperthermia, coma
Dermatologic: Rash, angioedema, urticaria
Endocrine & metabolic: Acidosis, hyperkalemia, dehydration, hypoglycemia (children), hyperglycemia, hypernatremia (buffered forms)
Gastrointestinal: Nausea, vomiting, dyspepsia, epigastric discomfort, heartburn, stomach pain, gastrointestinal ulceration (6% to 31%), gastric erosions, gastric erythema, duodenal ulcers
Hematologic: Anemia, disseminated intravascular coagulation, prolongation of prothrombin times, coagulopathy, thrombocytopenia, hemolytic anemia, bleeding, iron-deficiency anemia
Hepatic: Hepatotoxicity, transaminases increased, hepatitis (reversible)
Neuromuscular & skeletal: Rhabdomyolysis, weakness, acetabular bone destruction (OA)
Otic: Hearing loss, tinnitus
Renal: Interstitial nephritis, papillary necrosis, proteinuria, renal impairment, renal failure (including cases caused by rhabdomyolysis), increased BUN, increased serum creatinine
Respiratory: Asthma, bronchospasm, dyspnea, laryngeal edema, hyperpnea, tachypnea, respiratory alkalosis, noncardiogenic pulmonary edema
Miscellaneous: Anaphylaxis, prolonged pregnancy and labor, stillbirths, low birth weight, peripartum bleeding, Reye's syndrome
Postmarketing and/or case reports: Colonic ulceration, esophageal stricture, esophagitis with esophageal ulcer, esophageal hematoma, oral mucosal ulcers (aspirin-containing chewing gum), coronary artery spasm, conduction defect and atrial fibrillation (toxicity), delirium, ischemic brain infarction, colitis, rectal stenosis (suppository), cholestatic jaundice, periorbital edema, rhinosinusitis
ACE inhibitors: The effects of ACE inhibitors may be blunted by aspirin administration, particularly at higher dosages.
Buspirone increases aspirin's free % in vitro .
Carbonic anhydrase inhibitors and corticosteroids have been associated with alteration in salicylate serum concentrations.
Heparin and low molecular weight heparins: Concurrent use may increase the risk of bleeding.
Methotrexate serum levels may be increased; consider discontinuing aspirin 2-3 days before high-dose methotrexate treatment or avoid concurrent use.
NSAIDs may increase the risk of gastrointestinal adverse effects and bleeding. Serum concentrations of some NSAIDs may be decreased by aspirin.
Platelet inhibitors (IIb/IIIa antagonists): Risk of bleeding may be increased.
Probenecid effects may be antagonized by aspirin.
Sulfonylureas: The effects of older sulfonylurea agents (tolazamide, tolbutamide) may be potentiated due to displacement from plasma proteins. This effect does not appear to be clinically significant for newer sulfonylurea agents (glyburide, glipizide, glimepiride).
Valproic acid may be displaced from its binding sites which can result in toxicity.
Verapamil may potentiate the prolongation of bleeding time associated with aspirin.
Warfarin and oral anticoagulants may increase the risk of bleeding.
Ethanol: Avoid ethanol (may enhance gastric mucosal damage).
Food: Food may decrease the rate but not the extent of oral absorption.
Folic acid: Hyperexcretion of folate; folic acid deficiency may result, leading to macrocytic anemia.
Iron: With chronic aspirin use and at doses of 3-4 g/day, iron-deficiency anemia may result.
Sodium: Hypernatremia resulting from buffered aspirin solutions or sodium salicylate containing high sodium content. Avoid or use with caution in CHF or any condition where hypernatremia would be detrimental.
Benedictine liqueur, prunes, raisins, tea, and gherkins: Potential salicylate accumulation.
Fresh fruits containing vitamin C: Displace drug from binding sites, resulting in increased urinary excretion of aspirin.
Herb/Nutraceutical: Avoid cat's claw, dong quai, evening primrose, feverfew, garlic, ginger, ginkgo, red clover, horse chestnut, green tea, ginseng (all have additional antiplatelet activity). Limit curry powder, paprika, licorice; may cause salicylate accumulation. These foods contain 6 mg salicylate/100 g. An ordinarily American diet contains 10-200 mg/day of salicylate.
Duration: 4-6 hours
Absorption: Rapid
Distribution: Vd: 10 L; readily into most body fluids and tissues
Metabolism: Hydrolyzed to salicylate (active) by esterases in GI mucosa, red blood cells, synovial fluid, and blood; metabolism of salicylate occurs primarily by hepatic conjugation; metabolic pathways are saturable
Bioavailability: 50% to 75% reaches systemic circulation
Half-life elimination: Parent drug: 15-20 minutes; Salicylates (dose dependent): 3 hours at lower doses (300-600 mg), 5-6 hours (after 1 g), 10 hours with higher doses
Time to peak, serum: ~1-2 hours
Excretion: Urine (75% as salicyluric acid, 10% as salicylic acid)
Children:
Analgesic and antipyretic: Oral, rectal: 10-15 mg/kg/dose every 4-6 hours, up to a total of 4 g/day
Anti-inflammatory: Oral: Initial: 60-90 mg/kg/day in divided doses; usual maintenance: 80-100 mg/kg/day divided every 6-8 hours; monitor serum concentrations
Antiplatelet effects: Adequate pediatric studies have not been performed; pediatric dosage is derived from adult studies and clinical experience and is not well established; suggested doses have ranged from 3-5 mg/kg/day to 5-10 mg/kg/day given as a single daily dose. Doses are rounded to a convenient amount (eg, 1 /2 of 80 mg tablet).
Mechanical prosthetic heart valves: 6-20 mg/kg/day given as a single daily dose (used in combination with an oral anticoagulant in children who have systemic embolism despite adequate oral anticoagulation therapy (INR 2.5-3.5) and used in combination with low-dose anticoagulation (INR 2-3) and dipyridamole when full-dose oral anticoagulation is contraindicated)
Blalock-Taussig shunts: 3-5 mg/kg/day given as a single daily dose
Kawasaki disease: Oral: 80-100 mg/kg/day divided every 6 hours; monitor serum concentrations; after fever resolves: 3-5 mg/kg/day once daily; in patients without coronary artery abnormalities, give lower dose for at least 6-8 weeks or until ESR and platelet count are normal; in patients with coronary artery abnormalities, low-dose aspirin should be continued indefinitely
Antirheumatic: Oral: 60-100 mg/kg/day in divided doses every 4 hours
Adults:
Analgesic and antipyretic: Oral, rectal: 325-650 mg every 4-6 hours up to 4 g/day
Anti-inflammatory: Oral: Initial: 2.4-3.6 g/day in divided doses; usual maintenance: 3.6-5.4 g/day; monitor serum concentrations
Myocardial infarction prophylaxis: 75-325 mg/day; use of a lower aspirin dosage has been recommended in patients receiving ACE inhibitors
Acute myocardial infarction: 160-325 mg/day (have patient chew tablet if not taking aspirin before presentation)
CABG: 75-325 mg/day starting 6 hours following procedure; if bleeding prevents administration at 6 hours after CABG, initiate as soon as possible
PTCA: Initial: 80-325 mg/day starting 2 hours before procedure; longer pretreatment durations (up to 24 hours) should be considered if lower dosages (80-100 mg) are used
Stent implantation: Oral: 325 mg 2 hours prior to implantation and 160-325 mg daily thereafter
Carotid endarterectomy: 81-325 mg/day preoperatively and daily thereafter
Acute stroke : 160-325 mg/day, initiated within 48 hours (in patients who are not candidates for thrombolytics and are not receiving systemic anticoagulation)
Stroke prevention/TIA: 30-325 mg/day (dosages up to 1300 mg/day in 2-4 divided doses have been used in clinical trials)
Pre-eclampsia prevention (unlabeled use): 60-80 mg/day during gestational weeks 13-26 (patient selection criteria not established)
Dosing adjustment in renal impairment: Clcr<10 mL/minute: Avoid use.
Hemodialysis: Dialyzable (50% to 100%)
Dosing adjustment in hepatic disease: Avoid use in severe liver disease.
|
|
Serum Salicylate Concentration (mcg/mL) |
Desired Effects | Adverse Effects / Intoxication |
| ~100 |
Antiplatelet Antipyresis Analgesia |
GI intolerance and bleeding, hypersensitivity, hemostatic defects |
| 150-300 | Anti-inflammatory | Mild salicylism |
| 250-400 | Treatment of rheumatic fever | Nausea/vomiting, hyperventilation, salicylism, flushing, sweating, thirst, headache, diarrhea, and tachycardia |
| >400-500 | | Respiratory alkalosis, hemorrhage, excitement, confusion, asterixis, pulmonary edema, convulsions, tetany, metabolic acidosis, fever, coma, cardiovascular collapse, renal and respiratory failure |
Primary Prevention:
The U.S. Preventive Services Task Force strongly recommends that clinicians discuss aspirin therapy for primary prevention of heart disease with adults who are at increased risk. The balance of benefits and harm is most favorable in patients at high risk for coronary heart disease (those with a 5-year risk
3%). Risk can be calculated at www.med-decisions.com. Adequate blood pressure control is necessary in hypertensive patients who are candidates for aspirin.
Secondary Prevention: In unstable angina, aspirin reduces the rate of refractory angina, nonfatal MI, and death. Aspirin reduces the rate of recurrent ischemia and infarction, stroke and death following MI. In patients who have acute coronary syndrome (ACS) but are not already receiving aspirin, the first dose may be chewed to rapidly establish a high blood level.
Primary Prevention:
The U.S. Preventive Services Task Force strongly recommends that clinicians discuss aspirin therapy for primary prevention of heart disease with adults who are at increased risk. The balance of benefits and harm is most favorable in patients at high risk for coronary heart disease (those with a 5-year risk
3%). Risk can be calculated at www.med-decisions.com. Adequate blood pressure control is necessary in hypertensive patients who are candidates for aspirin.
Secondary Prevention: In unstable angina, aspirin reduces the rate of refractory angina, nonfatal MI, and death. Aspirin reduces the rate of recurrent ischemia and infarction, stroke and death following MI. In patients who have acute coronary syndrome (ACS) but are not already receiving aspirin, the first dose may be chewed to rapidly establish a high blood level.
Caplet:
Bayer® Aspirin: 325 mg [film coated]
Bayer® Aspirin Extra Strength: 500 mg [film coated]
Bayer® Extra Strength Arthritis Pain Regimen: 500 mg [enteric coated]
Bayer® Women's Aspirin Plus Calcium: 81 mg [contains elemental calcium 300 mg]
Caplet, buffered (Ascriptin® Extra Strength): 500 mg [contains aluminum hydroxide, calcium carbonate, and magnesium hydroxide]
Gelcap (Bayer® Aspirin Extra Strength): 500 mg
Gum (Aspergum®): 227 mg [cherry or orange flavor]
Suppository, rectal: 300 mg, 600 mg
Tablet: 325 mg
Aspercin: 325 mg
Aspercin Extra: 500 mg
Bayer® Aspirin: 325 mg [film coated]
Tablet, buffered: 325 mg
Ascriptin®: 325 mg [contains aluminum hydroxide, calcium carbonate, and magnesium hydroxide]
Bayer® Plus Extra Strength: 500 mg [contains calcium carbonate]
Bufferin®: 325 mg [contains citric acid]
Bufferin® Extra Strength: 500 mg [contains citric acid]
Buffinol: 325 mg [contains magnesium oxide]
Buffinol Extra: 500 mg [contains magnesium oxide]
Tablet, chewable: 81 mg
Bayer® Aspirin Regimen Children's Chewable: 81 mg [cherry, mint or orange flavor]
St. Joseph® Adult Aspirin: 81 mg [orange flavor]
Tablet, controlled release (ZORprin®): 800 mg
Tablet, enteric coated: 81 mg, 325 mg, 500 mg, 650 mg
Bayer® Aspirin Regimen Adult Low Strength, Ecotrin® Low Strength, St. Joseph Adult Aspirin: 81 mg
Bayer® Aspirin Regimen Regular Strength, Ecotrin®: 325 mg
Easprin®: 975 mg
Ecotrin® Maximum Strength: 500 mg
Halfprin: 81 mg, 162 mg
Sureprin 81™: 81 mg
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Antman EM, Anbe SC, Alpert JS, et al, "ACC/AHA Guidelines for the Management of Patients With ST-Elevation Myocardial Infarction - Executive Summary: A Report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines (Writing Committee to Revise the 1999 Guidelines for the Management of Patients With Acute Myocardial Infarction)," Circulation , 2004, 110:588-636. Available at: http://www.circulationaha.org/cgi/content/full/110/5/588. Last accessed August 26, 2004.
"Aspirin for the Primary Prevention of Cardiovascular Events: Recommendation and Rationale. U.S. Preventive Services Task Force," Ann Intern Med , 2002, 136(2):157-60.
Bar-Oz B, Bulkowstein M, Benyamini L, et al, "Use of Antibiotic and Analgesic Drugs During Lactation," Drug Saf , 2003, 26(13):925-35.
Branch DW and Khamashta MA, "Antiphospholipid Syndrome: Obstetric Diagnosis, Management, and Controversies," Obstet Gynecol , 2003, 101(6):1333-44.
Braunwald E, Antman EM, Beasley JW, et al, "ACC/AHA 2002 Guideline Update for the Management of Patients With Unstable Angina and Non-ST-Segment Elevation Myocardial Infarction - Summary Article: A Report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines (Committee on the Management of Patients With Unstable Angina)," J Am Coll Cardiol , 2002, 40(7):1366-74. Available at: http://www.acc.org/clinical/guidelines/unstable/incorporated/index.htm. Accessed May 20, 2003.
Carp HJ, "Antiphospholipid Syndrome in Pregnancy," Curr Opin Obstet Gynecol , 2004, 16(2):129-35.
Chobanian AV, Bakris GL, Black HR, et al, "The Seventh Report of the Joint National Committee on Prevention, Detection, Evaluation, and Treatment of High Blood Pressure: The JNC 7 Report," JAMA , 2003, 289(19):2560-71.
Coomarasamy A, Honest H, Papaioannou S, et al, "Aspirin for Prevention of Preeclampsia in Women With Historical Risk Factors: A Systematic Review," Obstet Gynecol , 2003, 101(6):1319-32.
Department of Health and Human Services, Food and Drug Administration, "Labeling for Oral and Rectal Over-the-Counter Drug Products Containing Aspirin and Nonaspirin Salicylates; Reye's Syndrome Warning; Final Rule, (29 CFR Part 201)," Federal Register , April 17, 2003, 18861-9.
Mokhlesi B, Leikin JB, Murray P, et al, "Adult Toxicology in Critical Care: Part II: Specific Poisonings," Chest , 2003, 123(3):897-922.
Ostensen M, "Nonsteroidal Anti-inflammatory Drugs During Pregnancy," Scand J Rheumatol Suppl , 1998, 107:128-32.
"Physician's Health Study: Aspirin and Primary Prevention of Coronary Heart Disease," N Engl J Med , 1989, 321(26):1825-8.
Schömig A, Neumann FJ, Kastrati A, et al, "A Randomized Comparison of Antiplatelet and Anticoagulant Therapy After the Placement of Coronary-Artery Stents," N Engl J Med , 1996, 334(17):1084-9.
"Seventh ACCP Consensus Conference on Antithrombotic and Thrombolytic Therapy," Chest , 2004, 126(3 Suppl):172-608.
Spigset O and Hagg S, "Analgesics and Breast-feeding: Safety Considerations," Paediatr Drugs , 2000, 2(3):223-38.
Tincani A, Branch W, Levy RA, et al, "Treatment of Pregnant Patients With Antiphospholipid Syndrome," Lupus , 2003, 12(7):524-9.
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