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math calculations with eye solution (1)

Calculate the total quantity and the total days supply for the following Rx:
brimonidine/timolol opth
1 ou bid
3 mL
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The doctor has prescribed brimonidine/timolol ophthalmic solution, but the pharmacist will have to dispense the brand name drug Combigan ophthalmic solution.
The doctor has prescribed 3 mL, but the quantity to be dispensed is 5 mL because this medication comes in two sizes only: 5mL and 10mL
The sig says: instill one drop into each eye twice daily
Now, we need to calculate the total days supply.
Assume 1 mL = 20 drops and, then, 5 mL = 100 drops
The patient will use 4 drops daily. Then, the total days supply will be 100 divided by 4 which is 25 days.
It is worth noting that some pharmacists may assume 1 mL = 15 drops
What are the total quantity and the total days supply for the following Rx:
Lumigan oph soln
disp: 5 mL
sig: 1 gtt ou once daily at night
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The doctor has prescribed the brand-name drug Lumigan ophthalmic solution.
The total quantity to be dispensed is 5 mL as stated by the doctor.
The pharmacist will dispense one bottle of 5 mL
The sig says: instill 1 drop in each eye once daily at night
The patient will use 2 drops per day.
Assume 1 mL = 20 drops and, then, 5 mL = 100 drops
Then, the total days supply will be 100 drops divided by 2 drops which is 50 days.
It is worth noting that the recommended use is once daily in the evening.
What are the total quantity and the total days supply for the following Rx:
Acuvail ophth solution 0.45%
1 gtt od bid
disp: 30
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The doctor has prescribed the brand-name drug Acuvail ophthalmic solution. It is supplied in single-use vials packaged in 6 pouches, 5 vials per pouch. In other words, the package has 30 single-use vials and each vial has 0.4mL of solution.
Now, 30 vials * 0.4 mL = 12 mL and, then, the package provides 12 mL of solution.
The total quantity to be dispensed is either 30 vials or 12 mL depending on the pharmacy computer system.
The sig says: instill 1 drop in the right eye twice daily
Now, the recommended dosing is --- one drop of Acuvail should be applied by the patient to the affected eye twice daily beginning 1 day prior to cataract surgery, and continued through the first 2 weeks of the postoperative period.
Based on the recommended dose, the total days supply will be 15 days.
What are the total quantity and the total days supply for the following Rx:
Acuvail 0.45% eye drops
qty: 1
sig: 1 gtt od tid
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The doctor has prescribed the brand-name drug Acuvail ophthalmic solution. It is supplied in single-use vials packaged in 6 pouches, 5 vials per pouch. In other words, the package has 30 single-use vials and each vial has 0.4mL of solution.
Now, 30 vials * 0.4 mL = 12 mL and, then, the package provides 12 mL of solution.
The total quantity to be dispensed is either 30 vials or 12 mL depending on the pharmacy computer system.
Notice that the doctor wrote 'qty: 1' which means that the pharmacist will dispense 1 package.
The sig says: instill 1 drop into right eye three times daily
The patient will use 3 drops per day. We know the package comes with 30 single-use vials. In turn, we can say that 1 drop is the same as 1 vial.
Then, the total days supply will be 30 vials divided by 3 drops which is 10 days.
Calculate the total quantity and the total days supply for the following Rx:
Garamycin ophth drops
sig: ii gtts ou qid
#5 mL
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The doctor has prescribed Garamycin ophthalmic solution, but this drug has been discontinued.
So, the pharmacist will have to dispense the generic Gentamicin ophthalmic solution.
The total quantity to be dispensed is 5 mL as stated by the doctor.
The sig says: instill two drops into each eye four times daily
In other words, the patient will use 2 drops * 2 eyes * 4 daily, that is, the patient will use 16 drops daily.
Now, we need to calculate the total days supply.
Assume 1 mL = 20 drops and, in turn, 5 mL = 100 drops
Then, the total days supply will be 100 drops divided by 16 drops which is 6 days.
It is worth noting that some pharmacists may assume 1 mL = 15 drops
Calculate the total quantity and the total days supply for the following Rx:
Garamycin eye soln
sig: i-ii drops affected eyes qid
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The doctor has prescribed Garamycin ophthalmic solution, but this drug has been discontinued.
So, the pharmacist will have to dispense the generic Gentamicin ophthalmic solution.
The regular size is 5 mL and then the total quantity to be dispensed is 5mL
The sig says: put 1 to 2 drops in the affected eyes four times daily
In other words, the patient may use 2 drops * 2 eyes * 4 daily, that is, the patient may use 16 drops daily.
Now, we need to calculate the total days supply.
Assume 1 mL = 20 drops and, in turn, 5 mL = 100 drops
Then, the total days supply will be 100 drops divided by 16 drops which is 6 days.
It is worth noting that some pharmacists may assume 1 mL = 15 drops
Calculate the total quantity and the total days supply for the following Rx:
Azithromycin 1% eye drops
2 gtts ou bid for 3 days
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The doctor has prescribed Azithromycin eye drops, but the pharmacist will dispense the brand-name drug Azasite 1% ophthalmic solution.
The days supply is 3 days as stated by the doctor.
The sig says: put 2 drops in both eyes twice daily for 3 days
The bottle has 2.5 mL which is the only size of Azasite available.
The quantity to be dispensed is either 2.5mL or 3mL depending on the pharmacy computer system.
One bottle of Azasite should be enough for 3 days.
It is worth noting that Azasite is kept in the refrigerator.
Calculate the total quantity and the total days supply for the following Rx:
Ciloxan 0.3% eye drops 2.5 mL; Sig: 1 gtt os qid
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The doctor has prescribed Ciloxan 0.3% ophthalmic solution, but the pharmacist may dispense the generic version ciprofloxacin 0.3% ophthalmic solution.
The total quantity is either 2.5mL or 3mL depending on the pharmacy computer system.
Assume 1 mL = 20 drops and, then, 2.5 mL = 50 drops
The sig says: put one drop in the left eye four times a day
The patient uses 1 drop in the left eye 4 times daily. So, 4 drops per day.
The total days supply will be 50 drops divided by 4 drops which is 12 days.
It is worth noting that some pharmacists may assume 1 mL = 15 drops
Calculate the total quantity and the total days supply for the following Rx:
Travatan
i gtt ou qhs
#3 month supply
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The doctor has prescribed Travatan ophthalmic solution 2.5 mL
The sig says: instill one drop into each eye at bedtime
The patient will use 2 drops daily.
The doctor wants the patient to get enough medicine for three months.
So, the patient will use 2 drops for 90 days, that is, the patient will use 180 drops total.
Now, we need to calculate how many bottles to dispense.
1 bottle has 2.5mL and assume 1 mL = 20 drops and then 2.5 mL = 50 drops
So, each bottle has 50 drops.
Now, how many bottles will the pharmacist dispense?
We need to divide 180 drops by 50 drops and, in turn, the pharmacist will dispense 4 bottles.
If 1 bottle = 2.5 mL, then 4 bottles = 10 mL
In turn, the total quantity to be dispensed is 10 mL
The total days supply is 90 days as stated by the doctor.
But, the insurance companies may not want to pay for four bottles all at once. So, the patient will have to get one bottle at a time.
In this case, the total quantity prescribed would be 10 mL, but the total quantity dispensed would be 2.5mL
We know that each bottle has 50 drops and the patient will use 2 drops daily. Then, the total days supply will be 50 divided by 2 which is 25 days.
Now, it is worth noting that some pharmacy computer systems may round off 2.5mL to 3mL. In turn, we will have to recalculate how many bottles to dispense and the total quantity to be dispensed.





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2006