Title: Blue dye for the blue patient<br/>Author: Kishan Kapadia<br/><a href='http://umem.org/profiles/faculty/1143/'>[Click to email author]</a><hr/><p>
Methylene blue is an extremely effective antidote for acquired methemoglobinemia but has important adverse effects if given in excess of recommended dose.</p>
<p>
<strong>Below is the usual dose of methylene blue for treatment of methemoglobinemia</strong></p>
<p>
1-2 mg/kg of 1% solution IV with a repeat dose given if there is inadequate response to the first one</p>
<p>
<u><strong>Adverse effects include</strong></u>:</p>
<ul>
<li>
>4 m/kg -- Reversible skin, feces, and urine discoloration</li>
<li>
5-7 mg/kg -- EKG abnormalities (T-wave inversions, diminished R-waves), shortness of breath, chest discomfort, diaphoresis, nausea, diarrhea, abdominal discomfort</li>
<li>
<strong><em>Paradoxically</em></strong>, between 4 and 15 mg/kg, it may cause methemoglobinemia</li>
</ul>
<fieldset><legend>References</legend>
<p>
Lo, J et al. A review of methylene blue treatment for cardiovascular collapse. 2014 <em>J Emerg Med </em>46(5):670-679.</p>
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