Title: Pharmacobezoar formation in acetaminophen<br/>Author: Hong Kim<br/><a href='http://umem.org/profiles/faculty/526/'>[Click to email author]</a><hr/><p>
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Pharmacobezoars (clumps of medication/pills) formation has been demonstrated in few medications such as aspirin, and ferrous sulfate tablets. Their presence can alter management due to prolonged absorption and may cause GI obstruction.</p>
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Acetaminophen (APAP) is a commonly available over-the-counter medication that is often implicated in an acute overdose event. A recently published in-vitro study (using pig stomach) investigated whether APAP can form a pharmacobezoar.</p>
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APAP group/dosage</p>
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25 gm (50 tablets)</li>
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37.5 gm (75 tablets)</li>
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50 gm (100 tablets)</li>
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Positive control group</p>
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ferrous sulfate (15 gm/50 tablets)</li>
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Negative control group</p>
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chlorpheniramine (200 mg (50 tablets)</li>
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<strong>Results</strong></p>
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APAP formed clumps in 37.5 gm and 50 gm groups</li>
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83% (5 out of 6) of the 25 gm APAP group did not form clumps.</li>
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Dissolution profile: APAP clumps released more slowly (over 60 min tested) compared to individual tablet without reaching a peak.</li>
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<strong>Conclusion</strong></p>
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APAP can form pharmacobezoar at doses greater than 37.5 gm (in-vitro model) and can result in prolonged or delayed toxicity due to pharmacobezoar formation.</li>
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<fieldset><legend>References</legend>
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Li YK et al. In vitro study of pharmacobezoar formation in simulated acetaminophen overdose. Clin Toxicol (Phila) 2019. <a 0.25em="" 0px="" background-color:="" box-sizing:="" color:="" font-size:="" href="https://doi.org/10.1080/15563650.2019.1705971" margin:="" open="" style="caret-color: rgb(51, 51, 51); font-family: " text-decoration:="" word-break:="">https://doi.org/10.1080/15563650.2019.1705971</a></p>
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