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304 lines
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<script type="text/javascript" src="/corehtml/pmc/jatsreader/ptpmc_3.22/js/jr.boots.min.js"> </script><title>Aspirin - Drugs and Lactation Database (LactMed®) - NCBI Bookshelf</title>
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<meta name="citation_keywords" content="Rheumintabletten">
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<meta name="citation_keywords" content="Acetylsalicylsaure">
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<meta name="citation_keywords" content="Durlaza">
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<meta name="citation_keywords" content="Sine-Off Sinus Medicine Tablets-Aspirin Formula">
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<meta name="citation_keywords" content="4-10-00-00138 (Beilstein Handbook Reference)">
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<meta name="DC.Title" content="Aspirin">
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<meta name="DC.Date" content="2024/09/15">
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<meta name="description" content="After aspirin ingestion, salicylic acid is excreted into breastmilk, with higher doses resulting in disproportionately higher milk levels. Long-term, high-dose maternal aspirin ingestion probably caused metabolic acidosis in one breastfed infant. Reye's syndrome is associated with aspirin administration to infants with viral infections, but the risk of Reye's syndrome from salicylate in breastmilk is unknown. An alternate drug is preferred over continuous high-dose, aspirin therapy. With low-dose aspirin (75 to 325 mg daily), no aspirin is excreted into breastmilk and salicylate levels are low. If a nursing mother uses aspirin, monitor the infant for bruising and bleeding.">
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<meta name="og:title" content="Aspirin">
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<meta name="og:description" content="After aspirin ingestion, salicylic acid is excreted into breastmilk, with higher doses resulting in disproportionately higher milk levels. Long-term, high-dose maternal aspirin ingestion probably caused metabolic acidosis in one breastfed infant. Reye's syndrome is associated with aspirin administration to infants with viral infections, but the risk of Reye's syndrome from salicylate in breastmilk is unknown. An alternate drug is preferred over continuous high-dose, aspirin therapy. With low-dose aspirin (75 to 325 mg daily), no aspirin is excreted into breastmilk and salicylate levels are low. If a nursing mother uses aspirin, monitor the infant for bruising and bleeding.">
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class="wsprkl btn" title="Jump to next match">▶</a></nav></nav></div><div id="jr-epub-interstitial" class="hidden"></div><div id="jr-content"><article data-type="main"><div class="main-content lit-style" itemscope="itemscope" itemtype="http://schema.org/CreativeWork"><div class="meta-content fm-sec"><div class="fm-sec"><h1 id="_NBK501196_"><span class="title" itemprop="name">Aspirin</span></h1><p class="fm-aai"><a href="#_NBK501196_pubdet_">Publication Details</a></p><p><em>Estimated reading time: 4 minutes</em></p></div></div><div class="jig-ncbiinpagenav body-content whole_rhythm" data-jigconfig="allHeadingLevels: ['h2'],smoothScroll: false" itemprop="text"><p>CASRN: 50-78-2</p><a href="https://pubchem.ncbi.nlm.nih.gov/substance/134971785" title="View this structure in PubChem" class="img_link" ref="pagearea=body&targetsite=entrez&targetcat=link&targettype=pubchem"><img src="https://pubchem.ncbi.nlm.nih.gov/image/imgsrv.fcgi?t=l&sid=134971785" alt="image 134971785 in the ncbi pubchem database" /></a><div id="LM332.Drug_Levels_and_Effects"><h2 id="_LM332_Drug_Levels_and_Effects_">Drug Levels and Effects</h2><div id="LM332.Summary_of_Use_during_Lactation"><h3>Summary of Use during Lactation</h3><p>After aspirin ingestion, salicylic acid is excreted into breastmilk, with higher doses resulting in disproportionately higher milk levels. Long-term, high-dose maternal aspirin ingestion probably caused metabolic acidosis in one breastfed infant. Reye's syndrome is associated with aspirin administration to infants with viral infections, but the risk of Reye's syndrome from salicylate in breastmilk is unknown. An alternate drug is preferred over continuous high-dose, aspirin therapy. With low-dose aspirin (75 to 325 mg daily), no aspirin is excreted into breastmilk and salicylate levels are low. If a nursing mother uses aspirin, monitor the infant for bruising and bleeding.</p></div><div id="LM332.Drug_Levels"><h3>Drug Levels</h3><p>Aspirin is rapidly metabolized to salicylate after ingestion, so most studies have measured salicylate levels in breastmilk after aspirin administration to the mother; however, some studies have not measured salicylate metabolites in breastmilk that may be hydrolyzed in the infant's gut and absorbed as salicylate.[<a class="bibr" href="#LM332.REF.1" rid="LM332.REF.1">1</a>]</p><p><i>Maternal Levels.</i> A woman taking aspirin 4 grams daily for rheumatoid arthritis was nursing her 5 kg infant (age not reported). Salicylate was not detectable (< 50 mg/L) in breastmilk with the relative insensitive assay used.[<a class="bibr" href="#LM332.REF.2" rid="LM332.REF.2">2</a>]</p><p>Six nursing mothers who were 2 to 8 months postpartum (average 5 months) were given aspirin doses of 500, 1000 and 1500 mg of aspirin orally on 3 separate occasions. Peak breastmilk salicylate levels were 5.8 mg/L, 15.8 mg/L, and 38.8 mg/L, respectively. The time of the peak levels occurred between 2 and 6 hours after ingestion, with little variation in levels over time. The disproportionate increase in milk levels as the dose increased was attributed to nonlinear metabolism and protein binding.[<a class="bibr" href="#LM332.REF.3" rid="LM332.REF.3">3</a>]</p><p>Milk and blood levels of salicylate and its metabolites were determined in 8 lactating women following oral administration of 1 gram of aspirin. Peak salicylic acid milk levels averaging 2.4 mg/L occurred 3 hours after the dose. Milk contents of salicyluric acid were greater than those of salicylic acid; a mean peak level of 10.2 mg/L was reached after 9 hours and the average level was 4.4 mg/L at 24 hours after the dose. Total salicylate and metabolite levels were 5.1 mg/L at 3 hours, 9.9 mg/L at 6 hours, 11.2 mg/L at 9 hours and 10.2 mg/L at 12 hours after the dose. Acid labile conjugates were less than 0.2 mg/L.[<a class="bibr" href="#LM332.REF.4" rid="LM332.REF.4">4</a>] Using an average salicylate plus salicyluric acid level over the first 12 hours, a fully breastfed infant would receive an average of 9.4% of the maternal weight-adjusted dosage.</p><p>Two women given aspirin 454 mg orally had peak salicylate milk levels of about 1 mg/L at 1 hour after the dose. The authors estimated that about 0.1% of the mothers' total dose would appear in breastmilk in 48 hours.[<a class="bibr" href="#LM332.REF.5" rid="LM332.REF.5">5</a>] However, salicylate metabolites were not measured in milk.</p><p>A woman who was breastfeeding a 4-month-old was taking long-term aspirin therapy in dosages ranging from 2 to 5.9 grams daily. During this therapy, milk was obtained 4 hours after a 650 mg dose and just before taking a dose of 975 mg. The trough milk salicylate level was 2 mg/L and a peak level of 10 mg/L occurred 3 hours after the dose. Salicylate levels ranged from 4 to 7 mg/L over the 5 hours after the peak.[<a class="bibr" href="#LM332.REF.6" rid="LM332.REF.6">6</a>] Using the peak level from this study, a fully breastfed infant would receive about 10% of the maternal weight-adjusted dosage of salicylate. The assay method used should have measured both salicylate and metabolites in milk.</p><p>Seven nursing mothers between 1 and 8 months postpartum were taking enteric-coated aspirin daily; six took 81 mg and one took 325 mg. Aliquots of a complete collection of milk from both breasts were analyzed for aspirin and salicylic acid 6 times over the following 24-hour period. Aspirin was undetectable (<0.61 mcg/L) in all samples. In mothers taking 81 mg of aspirin daily, the peak salicylate concentration in milk was 115 mcg/L at 2 to 4 hours after the dose and the average milk concentration was 24 mcg/L. In the woman taking 325 mg of aspirin, the peak milk salicylate concentration was 745 mcg/L at 1 hour after the dose and the average salicylate concentration was 107.4 mcg/L. The authors calculated a weight-adjusted infant salicylate dosage of 0.4%.[<a class="bibr" href="#LM332.REF.7" rid="LM332.REF.7">7</a>]</p><p><i>Infant Levels.</i> A 9-week-old infant who was born at 36 weeks gestation was receiving about 50% breastmilk and 50% formula. The infant's mother was taking 2.4 grams of aspirin daily and the infant's serum contained 65 mg/L of salicylate.[<a class="bibr" href="#LM332.REF.8" rid="LM332.REF.8">8</a>]</p><p>A 16-day-old infant developed metabolic acidosis with a salicylate serum level of 240 mg/L and salicylate metabolites in the urine. The possibility of direct administration to the infant could not be ruled out.[<a class="bibr" href="#LM332.REF.9" rid="LM332.REF.9">9</a>]</p></div><div id="LM332.Effects_in_Breastfed_Infants"><h3>Effects in Breastfed Infants</h3><p>One case report of metabolic acidosis was caused by salicylate in a 16-day old breastfed infant whose mother was taking aspirin 650 mg every 4 hours for arthritis.[<a class="bibr" href="#LM332.REF.9" rid="LM332.REF.9">9</a>] However, there was no measurement of salicylate in maternal serum or milk and it is unclear whether the infant had received any salicylate directly.</p><p>Thrombocytopenia, fever, anorexia and petechiae occurred in a 5-month-old breastfed infant 5 days after her mother started taking aspirin for fever. One week after recovery, the infant was given a single dose of aspirin 125 mg and the platelet count dropped once again. The original symptoms were probably caused by aspirin or salicylate in breastmilk.[<a class="bibr" href="#LM332.REF.10" rid="LM332.REF.10">10</a>]</p><p>Hemolysis after aspirin and phenacetin taken by the mother of a 23-day-old, glucose-6-phosphate dehydrogenase (G6PD) deficient infant was possibly due to aspirin in breastmilk.[<a class="bibr" href="#LM332.REF.11" rid="LM332.REF.11">11</a>]</p><p>In a telephone follow-up study, mothers reported no side effects among 15 infants exposed to aspirin (dosages and infant ages were unspecified) in breastmilk.[<a class="bibr" href="#LM332.REF.12" rid="LM332.REF.12">12</a>]</p></div><div id="LM332.Effects_on_Lactation_and_Breastmil"><h3>Effects on Lactation and Breastmilk</h3><p>Relevant published information was not found as of the revision date.</p></div><div id="LM332.Alternate_Drugs_to_Consider"><h3>Alternate Drugs to Consider</h3><p><a href="/books/n/lactmed/LM330/?report=reader">Acetaminophen</a>, <a href="/books/n/lactmed/LM142/?report=reader">Ibuprofen</a></p></div><div id="LM332.References"><h3>References</h3><dl class="temp-labeled-list"><dl class="bkr_refwrap"><dt>1.</dt><dd><div class="bk_ref" id="LM332.REF.1">Levy G. Salicylate pharmacokinetics in the human neonate. In: Morselli P, Garattini S, Sereni F, eds. Basic and therapeutic aspects of perinatal pharmacology. New York: Raven Press; 1975:319-30.</div></dd></dl><dl class="bkr_refwrap"><dt>2.</dt><dd><div class="bk_ref" id="LM332.REF.2">Erickson
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SH, Oppenheim
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[<a href="https://pubmed.ncbi.nlm.nih.gov/28418802" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 28418802</span></a>]</div></dd></dl><dl class="bkr_refwrap"><dt>8.</dt><dd><div class="bk_ref" id="LM332.REF.8">Unsworth
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J, d'Assis-Fonseca
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A, Beswick
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DT. Serum salicylate levels in a breast fed infant.
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Ann Rheum Dis
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1987;46:638-9.
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[<a href="/pmc/articles/PMC1002216/" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pmc">PMC free article<span class="bk_prnt">: PMC1002216</span></a>] [<a href="https://pubmed.ncbi.nlm.nih.gov/3662653" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 3662653</span></a>]</div></dd></dl><dl class="bkr_refwrap"><dt>9.</dt><dd><div class="bk_ref" id="LM332.REF.9">Clark
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JH, Wilson
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WG. A
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16-day-old breast-fed infant with metabolic acidosis caused by salicylate.
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Clin Pediatr (Phila)
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1981;20:53-4.
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[<a href="https://pubmed.ncbi.nlm.nih.gov/7449246" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 7449246</span></a>]</div></dd></dl><dl class="bkr_refwrap"><dt>10.</dt><dd><div class="bk_ref" id="LM332.REF.10">Terragna
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A, Spirito
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L. Thrombocytopenic purpura in an infant after administration of acetylsalicylic acid to the wet-nurse.
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Minerva Pediatr
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1967;19:613-6.
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[<a href="https://pubmed.ncbi.nlm.nih.gov/6069440" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 6069440</span></a>]</div></dd></dl><dl class="bkr_refwrap"><dt>11.</dt><dd><div class="bk_ref" id="LM332.REF.11">Harley
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JD, Robin
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H. "Late" neonatal jaundice in infants with glucose-6-phosphate dehydrogenase-deficient erythrocytes.
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Australas Ann Med
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1962;11:148-55.
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[<a href="https://pubmed.ncbi.nlm.nih.gov/13960788" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 13960788</span></a>]</div></dd></dl><dl class="bkr_refwrap"><dt>12.</dt><dd><div class="bk_ref" id="LM332.REF.12">Ito
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S, Blajchman
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A, Stephenson
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M, et al.
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Prospective follow-up of adverse reactions in breast-fed infants exposed to maternal medication.
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Am J Obstet Gynecol
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1993;168:1393-9.
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[<a href="https://pubmed.ncbi.nlm.nih.gov/8498418" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 8498418</span></a>]</div></dd></dl></dl></div></div><div id="LM332.Substance_Identification"><h2 id="_LM332_Substance_Identification_">Substance Identification</h2><div id="LM332.Substance_Name"><h3>Substance Name</h3><p>Aspirin</p></div><div id="LM332.CAS_Registry_Number"><h3>CAS Registry Number</h3><p>50-78-2</p></div><div id="LM332.Drug_Class"><h3>Drug Class</h3><p>Breast Feeding</p><p>Lactation</p><p>Milk, Human</p><p>Analgesic Agents</p><p>Anti-Inflammatory Agents, Non-Steroidal</p><p>Platelet Aggregation Inhibitors</p></div></div><div><dl class="temp-labeled-list small"><dl class="bkr_refwrap"><dt></dt><dd><div><p class="no_top_margin"><p><b>Disclaimer: </b>Information presented in this database is not meant as a substitute for professional judgment. You should consult your healthcare provider for breastfeeding advice related to your particular situation. The U.S. government does not warrant or assume any liability or responsibility for the accuracy or completeness of the information on this Site.</p></p></div></dd></dl></dl></div><div id="bk_toc_contnr"></div></div></div><div class="fm-sec"><h2 id="_NBK501196_pubdet_">Publication Details</h2><h3>Publication History</h3><p class="small">Last Revision: <span itemprop="dateModified">September 15, 2024</span>.</p><h3>Copyright</h3><div><div class="half_rhythm"><a href="/books/about/copyright/">Copyright Notice</a><p class="small"><b>Attribution Statement:</b> LactMed is a registered trademark of the U.S. Department of Health and Human Services.</p></div></div><h3>Publisher</h3><p><a href="https://www.nlm.nih.gov/" ref="pagearea=page-banner&targetsite=external&targetcat=link&targettype=publisher">National Institute of Child Health and Human Development</a>, Bethesda (MD)</p><h3>NLM Citation</h3><p>Drugs and Lactation Database (LactMed®) [Internet]. Bethesda (MD): National Institute of Child Health and Human Development; 2006-. Aspirin. [Updated 2024 Sep 15].<span class="bk_cite_avail"></span></p></div><div class="small-screen-prev"><a href="/books/n/lactmed/LM620/?report=reader"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" preserveAspectRatio="none"><path d="M75,30 c-80,60 -80,0 0,60 c-30,-60 -30,0 0,-60"></path><text x="20" y="28" textLength="60" style="font-size:25px">Prev</text></svg></a></div><div class="small-screen-next"><a href="/books/n/lactmed/LM971/?report=reader"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" preserveAspectRatio="none"><path d="M25,30c80,60 80,0 0,60 c30,-60 30,0 0,-60"></path><text x="20" y="28" textLength="60" style="font-size:25px">Next</text></svg></a></div></article></div><div id="jr-scripts"><script src="/corehtml/pmc/jatsreader/ptpmc_3.22/js/libs.min.js"> </script><script src="/corehtml/pmc/jatsreader/ptpmc_3.22/js/jr.min.js"> </script></div></div>
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