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math calculations with eye suspension (1)

Calculate the total quantity and the total days supply for the following Rx:
Nevanac
1 gtt os tid
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The doctor has prescribed Nevanac ophthalmic suspension. The bottle has 3mL of suspension.
Since the doctor did not state how much to dispense, the pharmacist will dispense one bottle of 3mL
So, the total quantity to be dispensed is 3 mL
The sig says: instill one drop into left eye three times daily
In other words, the patient will use 3 drops daily.
Now, we need to calculate the total days supply.
The bottle has 3 mL and, now, we assume 1 mL = 20 drops and then 3 mL = 60 drops
The total days supply will be 60 drops divided by 3 drops which is 20 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:
Besivance ophth susp
sig: i gtt ou qid
disp: 1 bottle
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The doctor has prescribed the brand-name drug Besivance ophthalmic suspension.
The doctor wants the pharmacist to dispense one bottle. The regular bottle size is 5 mL
Then, the total quantity to be dispensed is 5 mL
The sig says: instill 1 drop in each eye four times daily
The patient will use 1 drop * 2 eyes * 4 daily, that is, the patient will use 8 drops per day.
The bottle has 5 mL of medicine and now we need to convert 5 mL into drops.
Assume 1 mL = 20 drops and, then, 5 mL = 100 drops
The total days supply will be 100 drops divided by 8 drops which is 12 days.
What are the total quantity and the total days supply for the following Rx:
Alrex ophth solution
1-2 gtt ou qid x 5days
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The doctor has prescribed Alrex ophthalmic solution, but the pharmacist will dispense Alrex ophthalmic suspension. This medication is really a suspension.
The sig says: instill 1 to 2 drops in both eyes four times daily for 5 days
The total days supply is 5 days as stated by the doctor
This drug is supplied in a plastic bottle in the following sizes: 5 mL and 10 mL
The pharmacist will have to choose which size to dispense.
Since the patient needs the medication for 5 days only, the pharmacist will dispense one bottle of 5 mL
Then, the total quantity to be dispensed is 5 mL
Calculate the total quantity and the total days supply for the following Rx:
Brinzolamide suspension
qty: 10 mL
1 gtt ou tid
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The doctor has prescribed Brinzolamide eye suspension, but the pharmacist will dispense the brand-name drug Azopt ophthalmic suspension because there is no generic equivalent to Azopt yet.
The total quantity to be dispensed is 10 mL as stated by the doctor.
The sig says: instill 1 drop in both eyes three times daily
The patient will use 1 drop * 2 eyes * 3 daily, that is, the patient will use 6 drops per day.
Assume 1 mL = 20 drops and, then, 10 mL = 200 drops
Then, the total days supply will be 200 drops divided by 6 drops which is 33 days, but some insurance companies will reject 33 days. In turn, the pharmacist will enter 30 days on the computer.
Calculate the total quantity and the total days supply for the following Rx:
Pred Forte
ii gtts ou q12h
#5 mL
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The doctor has prescribed Pred Forte ophthalmic suspension, but the pharmacist may very well dispense the generic version Prednisolone acetate ophthalmic suspension.
The total quantity to be dispensed is 5mL as stated by the doctor. The smallest bottle has 5 mL
The sig says: instill two drops in each eye every 12 hours
Tha patient will use 2 drops * 2 eyes * 2 daily, that is, the patient will use 8 drops per day.
Now, we need to calculate the total days supply.
Assume 1 mL = 20 drops and, in turn, 5 mL = 100 drops
The total days supply will be 100 divided by 8 which is 12 days.
It is worth noting that the active ingredient of Pred Forte is Prednisolone acetate.
Therefore, we should not confuse Prednisolone acetate ophthalmic suspension with Prednisolone sodium phosphate ophthalmic solution.
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:
FML
1 ou qid
disp: 5 mL
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The doctor has prescribed FML 0.1% Liquifilm ophthalmic suspension, but many pharmacists will dispense the generic version Fluorometholone 0.1% ophthalmic suspension.
The total quantity is 5 mL as stated by the doctor.
The sig says: put 1 drop in each eye four times daily
In other words, the patient will use 1 drop * 2 eyes * 4 daily, that is, the patient will use 8 drops daily.
Now, we need to calculate the total days supply.
Let us assume that 1 mL = 20 drops and then 5 mL = 100 drops
The total days supply will be 100 drops divided by 8 drops which is 12 days.
Calculating the total days supply depends on how many drops the pharmacist will assign to 1 mL. Some pharmacists may assign 20 drops to 1 mL while other pharmacists may assign 15 drops to 1 mL





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