Calculating Dosages Using the Formula Method Directions: review the example below, then complete the 10 practice questions on the next page. Example: The physician orders 0.2g of Equanil tabs. The dose on hand is 400mg tab. Step 1: Determine whether the medication ordered and the medication on hand is available in the same unit of measure. Step 2: If the medication ordered and the medication on hand is not in the same unit of measure, you need to convert them so that both measures are expressed using the same unit of measure. Conversion: To change 0.2g to mg 1000mg: 1g = x mg: 0.2g x = 200mg or Multiply 0.2 x 1000 = 200 Step 3: Now use the following formula to calculate the dosage. Dose ordered Dose on hand x Quantity (Q) = Amount to give OR D x Q = Amount to give H The physician ordered 0.2g of Equanil tabs (0.2g converts to 200mg). The dose you have on hand is 400mg tabs. 200mg x 1 tab = 200 or 1 tab 400mg 400 2 Practice Problems (Show your work) 1. The physician orders 650mg of Acetaminophen. On hand you have 325mg tabs. How many tablets will be given to the patient? 2. The physician orders 1g of chloral hydrate. On hand you have 500mg caps. How many capsules will be given to the patient? 3. The physician orders 0.05g of Indocin. On hand you have 50mg caps. The patient will receive how many capsules? 4. The patient has a streptococcal throat infection and the physician has ordered 500mg of ampicillin IM. On hand you have a 1g vial that contains 250mg/ml. How many ml will be administered? 5. The physician orders 75mg of Demerol IM for pain. On hand you have 30ml multiple dose vials that contain 50mg/ml. How many ml will be given? 6. The physician orders 125mg of Diamox. On hand you have 250mg tablets. How many tablets will be given to the patient? 7. The physician orders 8000 USP units of heparin to be administered subcutaneously. On hand is a vial of 10,000 USP units per ml. How much heparin will be given? 8. The physician orders 600,000 units of Bicillin for an IM injection. What you have on hand are vials of 1,200,000 units per 2 milliliters. How many milliliters will be given patient? 9. The physician orders 250mg of Tagamet liquid. On hand you have 300mg/5ml. How many milliliters will be given? 10. The physician orders 60mg of Depo-Medrol. On hand you have 80mg/ml. How many mls will be given?
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