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Math Formulas
Pharmacy Calculations
Question | Answer |
---|---|
When question asks for mL/hour. | volume/time |
When question asks for mL/hour and just gives total volume, gtts/min, and gtts/mL. | time/volume x 60 minutes |
When question asks to solve for gtts/min. | volume/time x drop factor |
When question asks for number of tablets, capsules, mLs..... | need/have x quantity |
When question asks for quantity or strength solve for x. | strength/quantity = strength/quantity |
2 BSA formulas are: | cm x kg/3600 and in x lbs/3131 |
When question asks for amount to give patient when order says: strength/m2/day or hourly rate. | strength x BSA = amount to give |
m2 | BSA |
When question asks to solve for amount to give patient and you are given child's BSA and adult strength of medication. | strength x BSA/1.7 |
When question asks for amount to give patient using order of strength/kg/day(hourly rate). | strength x kilograms of body weight |
Young's Rule | age/age+years x adult dose |
Clark's Rule | weight/150 x adult dose |
Freid's Rule. | age/150 x adult dose |
When question asks to dilute medication from a precent strength. | initial strength/ final strength = initial volume/final volume |
Large units to smaller units | multiply |
Small units to large units | divide |