Lesson 23 - Dosage Calculation Methods

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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 give?

(0.8ml/(Xml) * (1ml) / (0.4ml) = (0.8)/(0.4) = 2ml Answer: 2ml

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?

(150ml * 20gtts) / (25 min) = 3000/25 = 2 hrs. Answer: 2 hrs

The prescription reads 500mg q12h x 10d. The medication is available in 250mg tabs. How many tablets will be dispensed?

(500mg) / (X tab) * (1 tab) / (250mg) = 500/250 = 2 tabs 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 Answer: 40

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?

(500mg) / (Xmg) * (5ml) / (125mg) = 2500/125 = 20ml Answer: 20ml

What is 212 degree Fahrenheit in Celsius?

(number of degrees F - 32) / 1.8 is the standard formula to convert from F to C. (212-32) / 1.8 = 100 Answer: 100 Degrees Celsius

How many milliliter's are in 1 Liter?

1000 mL

The physician has ordered the patient to receive 750ml of NS q6h. What flow rate should the pump be set for in ml/hr?

750ml/6hr = 125ml/hr. Answer:125ml/hr

A prescription order has been written for Glucophage 1gm BID c meals. The medication is available in 500mg tablets. How many tablets will patient take per dosage?

Convert grams to mg's 1gm = 1000mg (1000mg)/(X tab) * (1 tab)/(500mg) = 1000/500 = 2 tabs Answer: 2 Tabs

The physician has ordered Phenobarbital 1mg/kg tid. The child weighs 54lbs. What is the correct dosage for this patient?

Convert weight [lbs o 2.2 = kilograms] or [kg * 2.2 = pounds] 54lbs / 2.2 = 24.5kg = 25kg (25kg)/(Xmg) * (1mg)/(1kg) = 25mg Answer: 25mg

What would Omeprazole be prescribed for?

Heart Burn

A patient comes in with a prescription for Methadone Liquid that was written 4 months ago. What should the pharmacy technician do?

Tell the patient that unfortunately you cannot fill the script

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?

The age and weight of the patient is irrelevant to the question. Keep in mind, sometimes more information is given than is required for the equation. (100mcg)/(Xml) * (0.6ml)/(120mcg) = 60/120 = 0.5ml Answer: 0.5ml

The physician has prescribed Amoxicillin for a two year old patient. The adult dosage is 500mg tid. What is the child's dosage?

This uses Young's rule: Formula is: (Age in years / (Age in years + 12)) * (Average adult dose) 2yrs = (2 / (2 + 12)) * (500) = 71.4 Answer: 71.4mg

How many tablets are dispensed in a Z-pack?

Z pack's are typically composed of 6 tablets. Take 2 tablets stat,and then 1 tablets everyday thereafter until gone/ Answer: 6 tablets

The pharmacy receives and order for medication to be taken BID x 7 days and then QD x 21 days. How many tablets will be dispensed?

BID = twice daily 2 * 7 = 14 QD = once daily 1 * 21 = 21 14 + 21 = 35 Answer: 35


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