Pharmacy Rx

                                                                                     Conversions

 

                          

 

  GRAIN(GR) TO MILLIGRAM(MG)= X BY 60

  GRAMS(G) TO MILLIGRAMS(MG)= X BY 1000     or move deciaml point 3 places to the right

      MILLIGRAMS(MG) TO GRAMS(G)= DIVIDE BY 1000  or move 3 places to the left

  MILLILITERS(ML) TO GRAMS(G)= DIVIDE BY 1000

  OUNCES(OZ) TO GRAMS(G)= X BY 28.35

       MILLILITERS(ML) TO FLUID OZ= DIVIDE BY 30

      FLUID OZ TO MILLILITERS(ML)= X BY 30

 

                                                    

                                             Dosage Measurement Systems

                                                                                           

Household (Avoirdupois) system
1 tsp = 5 ml , 60 gtt(s)
1 tbsp = 15 ml
1 oz = 30 ml / cc
1 gallon (128 oz) = 3800 ml
1 quart (32 fluid oz)(2 pints)= 960 ml
1 pint (16 fluid oz)= 480 ml  or 473 ml
1 cup (8 fluid oz)= 240 ml
1 pound = 453.59237 grams
1 drop = 1 minim

 

 

**The unit of measure (IU) is used in fat-soluble vitamins (A,D,E), certain hormones, enzymes, & vaccines

**The unit of measure (mEq) is used usually for electrolytes (sodium, potassium, chloride, etc)

             


 

Extra measurements used in hospital setting
 
International Unit (IU)
Milliequivalent (mEq)
Metric System
 
1g = 1000 mg
 
1mg = 1000 mcg
1g = 1000,000 mcg
1kg = 1000 g
1ml = 20 gtts (ear,eye meds)
480 ml = 1pint, 16 oz
1ml = 100 units (insulin)
1L = 1000 ml
 1kg = 2.2 Lbs
453.59237 grams = 1 pound
Apothecary System
1 gr = 65 or 60 mg
15 gr = 1 g 

1 dr =  4 ml
1/2 gr = 30 mg 
5 gr  = 300-325 mg
10 gr =  600-650 mg
1/60 gr =  1 mg
8 dr, 1 oz = 30 gm

3 Scruples = 1 oz, 1 dr
1 Scruple = 20 gr

             

Fraction into a %

Ex} 6/9

6 divide by 9 = 0.66666 X 100 = 67%

Fraction into a decimal

Ex} 1/4

1 divide by 4 = 0.25

Decimal into a %

Ex} 1.5

1.5 X 100 = 150%

% into a decimal

Ex} 150%

150 / 100 = 1.5

Grains fraction into mg

Ex} 1/150 gr

1 divide by 150 = 0.00666 X 60 = 0.4 mg

Ratios are the same as fractions

Ex} 1:20 = 1/20

 

 

Ratio & Proportion method conversion

Ex} How many milliliters are in 6 ounces?


Looking at the conversions above

1 oz = 30ml   so lets calculate with the method


If             1 oz = 30ml

Then     6 oz =   X     

 

6 X 30 / 1 = 180ml in 6 ounces