Dosage Calculation

Measurements, Equivalents, Conversions
 
1 oz = 30 ml
1 tsp = 5 ml
1 tbs = 15 ml
1000ml = 1 liter
1000mcg = 1 mg
1 kg = 2.2lbs
 
Solving for X (Dosage Calculation)
 
    1. Routinely double check all math
    2. Assess each answer to determine if it is logical
    3. Seek out help if you have any question about accuracy
 
Using Ration and Proportion
 
Always write known quantities on the left
Always use same sequence (mg: ml::mg:ml)
Write incomplete or unknown quantities on the right.  This is also dosage ordered.
 
For example:    Give 700 mg of a drug with a dosage strength of 500 mg per 2 ml
            
                        500mg: 2ml::700mg: x ml
 
                        Multiply the means (inside) and the extremes (outside)
 
                         500x = 2 x 700
 
                    x = 2 x 700
                            500
                                                    x = 2.8 ml
                    x = 1400
                           500
 
If the drug weights are of different units of measurement, you must convert first.
 
For example:    Give 750 mg of medication.  Drug is available as 1gm/10ml
 
                        Convert gm to mg
                       1000:10::750::x
                        1000x = 7500
                                                                    
                    x = 7500
                          1000                x = 7.5 ml
                
 
 
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