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math calculations with Tamiflu oral suspension
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Calculate the total quantity and the total days supply for the following Rx: Tamiflu 12mg/mL sig: 4 mL bid x5d disp: 40 ------------------------------------------------------------ The doctor has prescribed the brand-name drug Tamiflu 12mg/mL oral suspension. Each bottle has 25 mL The sig says: take 4 mL by mouth twice daily for 5 days The total days supply is 5 days as stated by the doctor. The quantity prescribed by the doctor is 40 mL, but there is no way for the pharmacist to dispense exactly 40mL If 1 bottle = 25 mL, then 2 bottles = 50 mL So, the total quantity to be dispensed will have to be 50 mL In this case, the pharmacist will have to dispense 2 bottles. Now, the pharmacist may want to change the sig directions: take 4 mL by mouth twice daily for 5 days and then discard the remainder. |
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Calculate the total quantity and the total days supply for the following Rx: Tamiflu susp 30 mg bid x 5days QS ------------------------------------------------------------ The doctor has prescribed the brand-name drug Tamiflu 12mg/mL oral suspension. The sig says: take 30 mg by mouth twice daily for 5 days Notice that we need to convert 30 mg into mL because this medicine is in a liquid form. The ratio is 12mg/mL and notice that 12mg/mL is the same as 1mL/12mg x / 30 mg = 1 mL / 12 mg x = (30 * 1) / 12 x = 2.5 mL The new sig will say: take 2.5 mL by mouth twice daily for 5 days The patient will take 2.5 * 2 * 5 which means that the patient will take a total of 25mL Then, the total quantity to be dispensed is 25 mL In this case, the pharmacist will dispense one bottle of 25 mL The total days supply is 5 days as stated by the doctor. |
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Calculate the total quantity and the total days supply for the following Rx: Tamiflu 60mg/5mL #2oz 1 tsp po bid 0RF ------------------------------------------------------------ The doctor has prescribed 2 oz of Tamiflu oral suspension. Now, we need to convert 2 oz into mL 1 fluid ounce = 30 mL and therefore 2 oz = 60 mL So, the quantity is 60 mL, but each bottle of Tamiflu has 25 mL Then, there is no way for the pharmacist to dispense exactly 60 mL If 1 bottle = 25 mL, then 3 bottles = 75 mL So, the total quantity to be dispensed will be 75 mL In this case, the pharmacist will have to dispense 3 bottles of Tamiflu The sig says: take 1 teaspoonful by mouth twice daily In other words, the patient will take 1 * 5 * 2 which is 10mL per day. So, the total days supply will be 75mL divided by 10mL which is 7 days. It is worth noting that Tamiflu 60mg/5mL is the same as Tamiflu 12mg/mL Notice that the doctor has given no refill. |
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Calculate the total quantity and the total days supply for the following Rx: Tamiflu 60/5 45mg po bid x 5d ------------------------------------------------------------ The doctor has prescribed Tamiflu 60mg/5mL oral suspension. The sig says: take 45 mg by mouth twice daily for 5 days Since this is a suspension, we need to convert 45mg into mL Notice that 60mg/5mL is the same as 5mL/60mg x / 45 mg = 5 mL / 60 mg x = (45 * 5) / 60 x = 3.75 mL The new sig will say: take 3.75 mL by mouth twice daily for 5 days The patient will take 3.75 * 2 * 5 which is 37.5mL So, the quantity is 37.5mL, but each bottle of Tamiflu has 25 mL Then, there is no way for the pharmacist to dispense exactly 37.5 mL If 1 bottle = 25 mL, then 2 bottles = 50 mL So, the total quantity to be dispensed will be 50 mL In this case, the pharmacist will have to dispense 2 bottles of Tamiflu 12mg/mL It is worth noting that Tamiflu 60mg/5mL is the same as Tamiflu 12mg/mL The total days supply is 5 days as stated by the doctor. The pharmacist may want to change the sig directions: take 3.75 mL by mouth twice daily for 5 days and then discard the remainder. |
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