Nursing Entrance Exam

Nursing Preparation Study Guide

5.3 Formula #2 – Proportions At the end of formula #1 you saw the ratio below was derived. =

• • = form and amount in which the drug comes (tablet, capsule, liquid) • = desireddose • = amount to give Now let’s do an example. Imagine that a doctor prescribes 1 g Tylenol supplements to be administrated rectally every 6 hours if the temperature goes above 101. The Tylenol supplements come in 325 mg (scored) tablets. How many supplements should you administer? Again, begin my identifying what you know from the scenario. The dose comes in 325 mg tablets. Since the prescribed dose is in grams go ahead and convert the dose on the container to g, 325 mg = 0.325 g. Then since 325 g of the medicine is contained in 1 supplement then = 1 , and the desired dose is 1 g. Now substitute these values into the proportion. 0.325 g = 1 g 1 supp ? supp Then cross multiply and solve for the unknowns. (0.325 g)(? supp) = (1 g)(1 supp) ⟹ (0.325 g)(? supp) = 1(g)(supp) 0.325 g 0.325 g ⟹? supp = 1 0.325 supp = 3.08 supp Now interpret your results. Per the doctors’ orders 3 tablets need to be administered to the patient if need per conditions mentioned earlier. = dose on thecontainer

Achieve

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