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<script type="text/javascript" src="/corehtml/pmc/jatsreader/ptpmc_3.22/js/jr.boots.min.js"> </script><title>Mebendazole - Drugs and Lactation Database (LactMed®) - NCBI Bookshelf</title>
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<meta name="citation_inbook_title" content="Drugs and Lactation Database (LactMed®) [Internet]">
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<meta name="citation_title" content="Mebendazole">
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<meta name="citation_publisher" content="National Institute of Child Health and Human Development">
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<meta name="citation_date" content="2024/08/15">
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<meta name="citation_fulltext_html_url" content="https://www.ncbi.nlm.nih.gov/books/NBK501340/">
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<meta name="citation_keywords" content="mebendazole">
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<meta name="citation_keywords" content="Vermox">
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<meta name="citation_keywords" content="Telmin">
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<meta name="citation_keywords" content="Mebenvet">
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<meta name="citation_keywords" content="Pantelmin">
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<meta name="citation_keywords" content="Vermirax">
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<meta name="citation_keywords" content="Mebenoazole">
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<meta name="citation_keywords" content="Ovitelmin">
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<meta name="citation_keywords" content="Bantenol">
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<meta name="citation_keywords" content="Mebutar">
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<meta name="citation_keywords" content="Lomper">
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<meta name="citation_keywords" content="Vermicidin">
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<meta name="citation_keywords" content="Besantin">
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<meta name="citation_keywords" content="Verpanyl">
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<meta name="citation_keywords" content="Noverme">
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<meta name="citation_keywords" content="Mebendazolum">
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<meta name="citation_keywords" content="Mebendazol">
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<meta name="citation_keywords" content="MBDZ">
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<meta name="citation_keywords" content="31431-39-7">
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<meta name="citation_keywords" content="CCRIS 4479">
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<meta name="citation_keywords" content="UNII-81G6I5V05I">
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<meta name="citation_keywords" content="methyl N-(6-benzoyl-1H-benzimidazol-2-yl)carbamate">
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<meta name="DC.Title" content="Mebendazole">
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<meta name="description" content="Mebendazole is poorly excreted into breastmilk and poorly absorbed orally. Reports on the use of mebendazole during breastfeeding have found no adverse reactions in breastfed infants. There are rare case reports of a decrease in milk supply following use of mebendazole, but no convincing evidence that these were caused by the drug. No special precautions are required.">
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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="_NBK501340_"><span class="title" itemprop="name">Mebendazole</span></h1><p class="fm-aai"><a href="#_NBK501340_pubdet_">Publication Details</a></p><p><em>Estimated reading time: 3 minutes</em></p></div></div><div class="jig-ncbiinpagenav body-content whole_rhythm" data-jigconfig="allHeadingLevels: ['h2'],smoothScroll: false" itemprop="text"><p>CASRN: 31431-39-7</p><a href="https://pubchem.ncbi.nlm.nih.gov/substance/134998535" 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=134998535" alt="image 134998535 in the ncbi pubchem database" /></a><div id="LM465.Drug_Levels_and_Effects"><h2 id="_LM465_Drug_Levels_and_Effects_">Drug Levels and Effects</h2><div id="LM465.Summary_of_Use_during_Lactation"><h3>Summary of Use during Lactation</h3><p>Mebendazole is poorly excreted into breastmilk and poorly absorbed orally. Reports on the use of mebendazole during breastfeeding have found no adverse reactions in breastfed infants. There are rare case reports of a decrease in milk supply following use of mebendazole, but no convincing evidence that these were caused by the drug. No special precautions are required.</p></div><div id="LM465.Drug_Levels"><h3>Drug Levels</h3><p><i>Maternal Levels.</i> One author reported information received by personal communication from the manufacturer stating that after a single 100 mg oral dose of mebendazole to a nursing mother (time postpartum not stated), the peak milk level was 6 mcg/L. Mebendazole was no longer detectable (<1 mcg/L) in milk 13.25 hours after the dose.[<a class="bibr" href="#LM465.REF.1" rid="LM465.REF.1">1</a>]</p><p>One woman was given mebendazole 100 mg orally twice daily for 3 days beginning the first day postpartum. Mebendazole was measured in milk following treatment (exact timing not stated). Mebendazole was undetectable (<20 mcg/L) in milk. The authors stated that this value was in agreement with those reported by the manufacturer and that the infant probably absorbed negligible mebendazole from breastmilk.[<a class="bibr" href="#LM465.REF.2" rid="LM465.REF.2">2</a>]</p><p><i>Infant Levels.</i> Relevant published information was not found as of the revision date.</p></div><div id="LM465.Effects_in_Breastfed_Infants"><h3>Effects in Breastfed Infants</h3><p>A case series reported 45 nursing mothers who took mebendazole in doses ranging from 100 mg once to 200 mg twice daily for 3 days. About half took 100 mg repeated once after 7 to 14 days. Thirty-three of the infants were exclusively breastfed with ages ranging from 1 to 30 weeks of age. Eight of the 12 partially breastfed infants were over 20 weeks of age. None of the infants were reported by their mothers to have had any adverse reactions.[<a class="bibr" href="#LM465.REF.3" rid="LM465.REF.3">3</a>]</p><p>A cohort of 33 infants who were breastfed (extent not stated) by hospitalized mothers taking nifurtimox was followed in the Democratic Republic of the Congo. Thirty mothers took a full course of 30 doses of oral nifurtimox 15 mg/kg daily and all received 14 doses of intravenous eflornithine 400 mg/kg daily for 7 days for human African trypanosomiasis. (sleeping sickness). Seventeen nursing mothers also took mebendazole. No serious adverse events were reported in any of the breastfed infants.[<a class="bibr" href="#LM465.REF.4" rid="LM465.REF.4">4</a>,<a class="bibr" href="#LM465.REF.5" rid="LM465.REF.5">5</a>]</p></div><div id="LM465.Effects_on_Lactation_and_Breastmil"><h3>Effects on Lactation and Breastmilk</h3><p>A nursing mother who was 13 weeks postpartum was taking oral metronidazole 250 mg three times daily. Milk production seemed to be unaffected. On the eighth day of therapy she passed a roundworm. Metronidazole was discontinued and oral mebendazole 100 mg twice daily was started. The patient was "tense" for a few days after passing the worm. On the second day of mebendazole treatment, milk production dropped markedly and she began supplementation with formula. By day 7, milk production had ceased. The authors suggested that mebendazole might have caused the drop in milk production, but offered no further evidence other than the temporal relationship.[<a class="bibr" href="#LM465.REF.6" rid="LM465.REF.6">6</a>]</p><p>Four patients were treated with oral mebendazole 100 mg twice daily for 3 days beginning the first day postpartum. Two had pinworm (<i>Enterobius</i>), 1 had roundworm (<i>Ascaris</i>) and 1 had hookworm (<i>Ancyclostomia</i>) infestations. All breastfed successfully.[<a class="bibr" href="#LM465.REF.2" rid="LM465.REF.2">2</a>]</p><p>One author reported information received by personal communication from the manufacturer stating that no inhibition of lactation was noted after a single 100 mg oral dose of mebendazole to a nursing mother (time postpartum not stated).[<a class="bibr" href="#LM465.REF.1" rid="LM465.REF.1">1</a>]</p><p>In a case series reported 45 nursing mothers who took mebendazole in doses ranging from 100 mg once to 200 mg twice daily for 3 days, one mother reported a slight decrease in milk production.[<a class="bibr" href="#LM465.REF.3" rid="LM465.REF.3">3</a>]</p></div><div id="LM465.Alternate_Drugs_to_Consider"><h3>Alternate Drugs to Consider</h3><p>
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<a href="/books/n/lactmed/LM491/?report=reader">Albendazole</a>
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</p></div><div id="LM465.References"><h3>References</h3><dl class="temp-labeled-list"><dl class="bkr_refwrap"><dt>1.</dt><dd><div class="bk_ref" id="LM465.REF.1">Stoukides
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C.
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Can a mother safely breastfeed while on mebendazole (Vermox)?
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J Hum Lact
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1994;10:269.
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[<a href="https://pubmed.ncbi.nlm.nih.gov/7619284" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 7619284</span></a>]</div></dd></dl><dl class="bkr_refwrap"><dt>2.</dt><dd><div class="bk_ref" id="LM465.REF.2">Kurzel
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RB, Toot
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PJ, Lambert
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LV, et al.
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Mebendazole and postpartum lactation.
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N Z Med J
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1994;107:439.
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[<a href="https://pubmed.ncbi.nlm.nih.gov/7970347" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 7970347</span></a>]</div></dd></dl><dl class="bkr_refwrap"><dt>3.</dt><dd><div class="bk_ref" id="LM465.REF.3">Karra
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N, Cohen
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R, Berlin
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M, et al.
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Safety of mebendazole use during lactation: A case series report.
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Drugs R D
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2016;16:251-4.
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[<a href="/pmc/articles/PMC5045833/" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pmc">PMC free article<span class="bk_prnt">: PMC5045833</span></a>] [<a href="https://pubmed.ncbi.nlm.nih.gov/27623793" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 27623793</span></a>]</div></dd></dl><dl class="bkr_refwrap"><dt>4.</dt><dd><div class="bk_ref" id="LM465.REF.4">Schmid
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C, Kuemmerle
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A, Blum
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J, et al.
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In-hospital safety in field conditions of nifurtimox eflornithine combination therapy (NECT) for T. b. gambiense sleeping sickness.
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PLoS Negl Trop Dis
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2012;6:e1920.
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[<a href="/pmc/articles/PMC3510081/" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pmc">PMC free article<span class="bk_prnt">: PMC3510081</span></a>] [<a href="https://pubmed.ncbi.nlm.nih.gov/23209861" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 23209861</span></a>]</div></dd></dl><dl class="bkr_refwrap"><dt>5.</dt><dd><div class="bk_ref" id="LM465.REF.5">Kuemmerle
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A, Schmid
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C, Kande
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V, et al.
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Prescription of concomitant medications in patients treated with nifurtimox eflornithine combination therapy (NECT) for T.b. gambiense second stage sleeping sickness in the Democratic Republic of the Congo.
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PLoS Negl Trop Dis
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2020;14:e0008028.
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[<a href="/pmc/articles/PMC7004379/" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pmc">PMC free article<span class="bk_prnt">: PMC7004379</span></a>] [<a href="https://pubmed.ncbi.nlm.nih.gov/31986140" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 31986140</span></a>]</div></dd></dl><dl class="bkr_refwrap"><dt>6.</dt><dd><div class="bk_ref" id="LM465.REF.6">Rao
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TS. Does mebendazole inhibit lactation?
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N Z Med J
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1983;96:589-90.
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[<a href="https://pubmed.ncbi.nlm.nih.gov/6575310" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 6575310</span></a>]</div></dd></dl></dl></div></div><div id="LM465.Substance_Identification"><h2 id="_LM465_Substance_Identification_">Substance Identification</h2><div id="LM465.Substance_Name"><h3>Substance Name</h3><p>Mebendazole</p></div><div id="LM465.CAS_Registry_Number"><h3>CAS Registry Number</h3><p>31431-39-7</p></div><div id="LM465.Drug_Class"><h3>Drug Class</h3><p>Breast Feeding</p><p>Lactation</p><p>Milk, Human</p><p>Anti-Infective Agents</p><p>Antiparasitic Agents</p><p>Antinematodal Agents</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="_NBK501340_pubdet_">Publication Details</h2><h3>Publication History</h3><p class="small">Last Revision: <span itemprop="dateModified">August 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-. Mebendazole. [Updated 2024 Aug 15].<span class="bk_cite_avail"></span></p></div><div class="small-screen-prev"><a href="/books/n/lactmed/LM783/?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/mechlorethamine/?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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