The veterinarian asks you to fill a prescription for butorphanol for a coughing dog, dispensing sufficient tablets for 5 days of treatment. The dog weighs 55 lb. The recommended dose is 0.08 mg/kg. The tablets are available in 1-, 5-, and 10-mg sizes. The charge is $0.35 per tablet. How many tablets are required for a single dose? If the dosage specifies use q6h, how many tablets are required for each day of treatment? How many tablets should you dispense for the total 5 days of treatment? What is the charge for the dispensed medication?
First convert the dog's weight to kilograms: 55 lb x 1 kg/2.2 lb = 25 kg. Now determine how much drug a 25-kg dog will need: 25 kg x 0.08 mg/kg = 2 mg of drug needed. Now select the tablet size, keeping in mind that you do not want to break a tablet into anything smaller than one half of a tablet. If the 1-mg tablet size is used then we need: 2 mg x 1 tablet/1 mg = 2 tablets per dose. Now determine how many tablets you will need for 5 days of treatment if the drug is to be given q6h (every 6 hours). You would need 2 tablets/dose x 4 doses/day x 5 days = 40 tablets for the 5-day period. Cost of the medication of 40 tablets x $0.35/tablet = $14.00