Dosage calculator

Values here based on information cotanined in William White's Frequently Asked Questions about Dextromethorphan. All listed values are approximations. This section is intended as a quick reference for individuals with ample DXM experience, it is not suitable for inexperienced individuals. YOU MUST CONSULT <a href="faq/index.html">THE DEXTROMETHORPHAN FAQ</a> AND AN EXPERIENCED INDIVIDUAL BEFORE ATTEMPTING TO EXPERIENCE DXM. Cold medicines are dangerous when taken in large quantities and have the potential of making you Sick or Dead.

<script language="JavaScript">function fix() { var w; w=parseFloat(document.tform.wunit.options[ document.tform.wunit.selectedIndex].value)* parseFloat(document.tform.wei.value)/ parseFloat(document.tform.what.options[ document.tform.what.selectedIndex].value); document.tform.p1l.value=w*1.5; document.tform.p1h.value=w*2.5; document.tform.p2l.value=w*2.5; document.tform.p2h.value=w*7.5; document.tform.p3l.value=w*7.5; document.tform.p3h.value=w*15; document.tform.p4l.value=w*15; document.tform.p4h.value=w*20; document.tform.p1u.value=w*2.25; document.tform.p2u.value=w*6.4; document.tform.p3u.value=w*9.4; document.tform.p4u.value=w*18; }</script> <form action="" method="POST" name="tform" type="post"> <p>Javascript DXM Dosage Calculator
I weigh: <input type="text" name="wei" value="" size="4" onchange="fix()"> <select name="wunit" type="text" onchange="fix()"> <option value="1" selected>kg <option value="0.4536">lbs </select>  and I want to take  <select name="what" onchange="fix()"> <option value="88.5" selected>Robitussin (oz) <option value="3">Robitussin (ml) <option value="1">Pure (mg) <option value="15">Robitussin Cough Gels (tablets) * <option value="30">30mg Tablets (Outside of US) </select> .

Usenet recommends
<input type="text" name="p1l" value="0" size="8">
<input type="text" name="p1h" value="0" size="8">
<input type="text" name="p1u" value="0" size="8">
<input type="text" name="p2l" value="0" size="8">
<input type="text" name="p2h" value="0" size="8">
<input type="text" name="p2u" value="0" size="8">
<input type="text" name="p3l" value="0" size="8">
<input type="text" name="p3h" value="0" size="8">
<input type="text" name="p3u" value="0" size="8">
<input type="text" name="p4l" value="0" size="8">
<input type="text" name="p4h" value="0" size="8">
<input type="text" name="p4u" value="0" size="8">
   *Note: Because of antihistimine
  product, Coricidin&#153; is suitable for only first and
  second-plateau dosage.
Thanks to Patrik Lundin for the code.

Dosage Scale

<img src="/web/20170424063856im_/" alt="graphical doseage scale" width="467" height="102" align="bottom">

Metric/US Conversion Table

1 pound (lb) =

0.4536 kilogram (kg)

1 kg =

2.2046 pounds

1 US Fluid Ounce (fl oz) =

28.4131 milliliters (ml)

1 ml =

0.0352 fl oz

1 milligram (mg) =

3.5274 ounces (oz)

1 oz =

0.2835 mg

Dosage Table

Table 1: DXM Plateaus and Dosages





Dosage Range (mg/kg)

1.5-2.5 mg/kg

2.5-7.5 mg/kg

7.5-15 mg/kg


Usenet Suggestions (mg/kg)

2.7 mg/kg

6.4 mg/kg

9.4 mg/kg



Gelcaps (30mg) for 75kg adult

4 to 6 gelcaps

6 to 18 gelcaps

18 to 37 gelcaps

>37 gelcaps

Adjust per 10kg

1/2 to 1 gelcap

1 to 2.5 gelcaps

2.5 to 5 gelcaps

5 gelcaps


Gelcaps (30mg) for 150lb adult

3 to 5 gelcaps

5 to 17 gelcaps

17 to 34 gelcaps

>34 gelcaps

Adjust per 25lb

1/2 to 1 gelcaps

1 to 2.5 gelcaps

2.5 to 5.5 gelcaps

5.5 gelcaps


Syrup (3mg/ml) for 75kg adult

37 to 62 ml

62 to 187 ml

187 to 375 ml

>375 ml

Adjust per 10kg

5 to 8 ml

8 to 25 ml

25 to 50 ml

50 ml


Syrup (3mg/ml) for 150lb adult

2 tbsp to 2 oz (1/4 cup)

2 oz to 5.5 oz (2/3 cup)

5.5 oz to 11 oz (1 1/3 cup)


Adjust per 25lb

1 tsp to 2 tsp

2 tsp to 1 oz (1/8 cup)

2 tbsp to 2oz (1/4 cup)

2 oz

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