Monday, December 7, 2015

Dosage Calculation - Mass for Mass Questions

Source Website: http://www.dosagehelp.com/mass.html
By DosageHelp.com


Mass for Mass Questions
Given an amount of mass per tablet, how many tablets do you require?

 
Formula:  


    
         
            
              Ordered
              Have
           
           =
           Y(Tablets required)
        
  

Example: Metroprolol (Lopressor), 25 mg PO, is ordered. Metropolol is available as 50 mg tablets. How many tablets would the nurse administer?

         
            
              Ordered
              Have
           
           =
           Y(Tablets required)
        

         
            
              25 mg
              50 mg
           
           =
           
             
              1
              2
            
           tablets
           
        
Alternatively, 50 mg = 1 tablet
Therefore 25 mg = 1/50 x 25 = 0.5 tablets

Example: Potassium Chloride is available as 10 mg per tablet. Potassium Chloride (K-Dur), 40 mg is ordered. How many tablets would the nurse administer?

         
            
              Ordered
              Have
           
           =
           Y(Tablets required)
        

         
            
              40 mg
              10 mg
           
           =
           
             4 tablets
           
        
Alternatively, 10 mg = 1 tablet
Therefore 40 mg = 1/10 x 40 = 4 tablets

Example: (From Ngee Ann Polytechnics Dosage Calculation Worksheet)
ORDER: Drug C 0.35 mg P.O.
AVAILABLE: Drug C tabs 0.7 mg


         
           GIVE:
           
             
          
          Tab(s)
        

         
            
              Ordered
              Have
           
           =
           Y(Tablets required)
        

         
            
              0.35 mg
              0.7 mg
           
           =
           
             
              1
              2
            
           tablets
           
        
Alternatively, 0.7 mg = 1 tablet
Therefore 0.35 mg = 1/0.7 x 0.35 = 0.5 tablets

Continue (Dosage Calculation - Mass for Mass Questions - (2))


Reference

[1] Advanced Formatting, Ry’s MathML Tutorial, http://rypress.com/tutorials/mathml/advanced-formatting.
[2] MathML, Presentation MathML, https://en.wikipedia.org/wiki/MathML.
[3] MathJax in Blogger (II), Posted on Tuesday, 12 July 2011, http://irrep.blogspot.sg/2011/07/mathjax-in-blogger-ii.html
[4] MathJax, http://docs.mathjax.org/en/latest/start.html