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Pharmacy IV drip calculation
by John D
An IV has been ordered to run for 4 hours at 10gtt/min with a drop factor of 20 gtt/ml. The solution in the bag is 750mg of active drug dissolved in .5L of D5NS. How many mg of the active drug will the patient receive in two hours? by Jerry This is question #1 from free quiz #4. It has a fair amount of fluff to decode thru. It's a good example of what you coud expect on the PTCB or ExCPT exam. So, first write down all necessary factors, and then work toward the unknown variable. Here's one way to do it: First, convert hours to minutes: 2 Hours = 120 Min Then, Figure out how many drips will drop in that time : 120 Min x 10gtt/min = 1200gtt/duration Next Divide the drips by how many make up an mL : 1200gtt ÷ 20gtt/mL = 60mL Lastly, Setup a quick conversion against the IV solution : 750mg     X  =  crossmultiply for X 500mL    60mL Now, your turn... X =
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