Lesson 23 - Dosage Calculation Methods 100% Pass

Lesson 23 - Dosage Calculation Methods 100% Pass The physician has ordered Phenobarbital 1mg/kg tid. The child weighs 54lbs. What is the correct dosage for the patient? 25mg 54lbs / 2.2 = 24.5kg = 25kg (25kg)/(Xmg) * (1mg)/(1kg) = 25mg How many milliliters are in a liter? 1,000 mL The prescription reads 500mg q12h x 10d. The medication is 250mg tabs. How many tablets will be dispensed? 40 Q12h = every 12 hours = twice daily 2 tabs * 2 daily = 4 tabs a day 10d = 10 days 4 tabs * 10 day = 40 tabs total dispensed What is 212 degrees Fahrenheit in Celsius? 100 Degrees Celsius (number of degrees F - 32) / 1.8 is the standard formula to convert from F to C. (212-32) / 1.8 = 100 How many tablets are dispensed in a Z-pack? 6 tablets Z pack's are typically composed of 6 tablets. Take 2 tablets stat, and then 1 tablet every day thereafter until gone A prescription order has been written for Glucophage 1mg BID c meals. The medication is available in 500mg tablets. How many tablets will patient take per dose? 2 Tabs Convert grams to mg's 1gm = 1000mg (1000mg)/(X tab) * (1 tab)/(500mg) = 2 tabs A patient comes in with a prescription for Methadone Liquid that has written 4 months ago. What should the pharmacy technician do? Tell the patient that unfortunately you cannot fill the script What would Omeprazole be prescribed for? Heart Burn The order is 150ml to be infused at 25gtts/min. The drop factor is 20gtts/ml. How long will it take for all the 150ml to be infused? 2 hrs (150ml * 20gtts) / (25 min) = 3000/25 = 2 hours The doctor orders 100mcg qd to be given to a 45 year old patient weighing 135lbs. The drug is available in 120mcg/0.6ml. How many ml's will be given? 0.5ml (100mcg)/(Xml) * (0.6ml)/(120mcg) = 60/120 = 0.5ml The physician has ordered 0.8mg/ml to be given BID. The medication is available at 0.4mg/ml. What is the dosage amount to given? 2ml (0.8ml)/(Xml) * (0.4ml) = (0.8)/(0.4) =2ml The physician has ordered the patient to receive 750ml of NS q6h. What flow rate should the pump be set for ml/hr? 125ml/hr 750ml/6hr = 125ml/hr The physician has prescribed Amoxicillin for a two year old patient. The adult dosage is 500mg tid. What is the child's dosage? 71.4mg Formula is: (Age in years / (age in years + 12)) * (average adult dose) 2yrs = (2 / (2+12)) * (500) = 71.4 The pharmacy receives an order for medication to be taken BID x 7 days and then QD x 21 days. How many tablets will be dispensed? 35 BID = twice daily 2 * 7 = 14 QD = once daily 1* 21 = 21 14 + 21 = 35 The pharmacy receives an order for Augmentin 500mg TID. This medication is available 125mg/5ml. What is the volume of medication to be given with each dosage? 20ml (500mg) / (Xmg) * (5ml) / (125mg) = 2500/125 = 20ml