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math calculations with oral inhaler HFA

Calculate the total quantity and the total days supply for the following Rx:
Proventil HFA
sig: ii puffs qid
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The sig says: inhale 2 puffs by mouth four times daily
So, the patient has to inhale 2 puffs * 4, which means the patient will inhale 8 puffs daily.
This inhaler has 200 metered inhalations and the content is 6.7g
So, the days supply will be 200 divided by 8 which is 25 days.
The total quantity to be dispensed is either 6.7g or 7g depending on the pharmacy computer system.
Calculate the total quantity and the total days supply for the following Rx:
Flovent HFA 44 mcg
2 puffs bid prn
#11
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The doctor has prescribed Flovent HFA 44 mcg inhaler.
This inhaler provides 120 actuations and the content is 10.6g
Now, the total quantity to be dispensed is either 10.6g or 11g depending on the pharmacy computer system.
In this case, the pharmacist will dispense one inhaler.
The sig says: inhale 2 puffs twice daily as needed
So, the patient will inhale 4 puffs per day and, in turn, the total days supply will be 120 inhalations divided by 4 puffs which is 30 days.
It is worth noting that the doctor wrote 11 for quantity, but the exact content of the inhaler is 10.6
What are the total quantity and the total days supply for the following Rx:
Flovent HFA 110 mcg
sig: 2 inhalations bid
disp: 1
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The doctor has prescribed Flovent HFA 110 mcg inhaler.
This inhaler provides 120 actuations and the content is 12 grams.
So, the total quantity to be dispensed is 12 g
In this case, the pharmacist will dispense one inhaler as stated by the doctor.
The sig says: inhale 2 puffs twice daily
So, the patient will inhale 4 puffs per day and, in turn, the total days supply will be 120 inhalations divided by 4 puffs which is 30 days.
It is worth noting that actuations, inhalations, and puffs are used interchangeably.
What are the total quantity and the total days supply for the following Rx:
beclomethasone dipropionate
1 inhalation bid
dose: 80 mcg (7.3gm)
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The doctor has prescribed beclomethasone dipropionate HFA 80mcg. But, the pharmacist will very likely dispense the brand-name drug QVAR 80mcg
QVAR is a HFA inhaler which contains the active ingredient beclomethasone dipropionate. At this moment, there is no generic equivalent to QVAR.
The content of the inhaler is 7.3g and the inhaler provides 100 metered inhalations.
The total quantity to be dispensed is either 7.3 grams or 8 grams depending on the pharmacy computer system.
The sig says: use 1 inhalation by mouth twice daily
The patient will inhale 2 puffs per day.
So, the total days supply will be 100 divided by 2 which is 50 days.
It is worth noting that inhalations, puffs, and actuations have the same meaning and are used interchangeably.
Calculate the total quantity and the total days supply for the following Rx:
Advair 45/21
sig: 2 puffs po bid x 1m
#1
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The doctor has prescribed Advair HFA 45mcg/21mcg inhaler. This inhaler provides 120 puffs and the size of the inhaler is 12gm
The sig says: inhale 2 puffs by mouth twice daily for 30 days
The total quantity to be dispensed is 12 g
In other words, the pharmacist will dispense one inhaler.
The total days supply is 30 days as stated by the doctor.
Now, the pharmacist may want to check the days supply. The patient will inhale 4 puffs daily and we know that the inhaler contains 120 puffs. Then, the total days supply will be 120 divided by 4 which is 30 days.
Calculate the total quantity and the total days supply for the following Rx:
Xopenex HFA
2 puffs q4-6h prn sob
#1
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The doctor has prescribed Xopenex HFA inhalation aerosol 15g with 200 inhalations. The box has one inhaler.
The total quantity to be dispensed is 15 g
The sig says: inhale 2 puffs by mouth every 4 to 6 hours as needed for shortness of breath
In order to calculate the total days supply, the pharmacist will use the maximum amount of medicine the patient can use per day.
In this case, the patient may use up to 2 puffs six times daily, that is, the patient may use up to 12 puffs daily.
Then, the total days supply will be 200 divided by 12 which is 16 days.
What are the total quantity and the total days supply for the following Rx:
ProAir HFA
2 inhalations q 4 to 6 h
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This inhaler is supplied as an 8.5g canister containing 200 puffs.
The total quantity to be dispensed is either 8.5g or 9g depending on the pharmacy computer system.
The sig says: inhale 2 puffs by mouth every 4 to 6 hours
The patient may use up to 2 puffs every 4 hours, that is, the patient may use up to 2 puffs six times daily. So, the patient may use up to 12 puffs daily.
The total days supply will be 200 divided by 12 which is 16 days.
What are the total quantity and the total days supply for the following Rx:
Ventolin HFA
2 inhalations 15 to 30 minutes before exercise
#60 inhalations
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This inhaler is supplied as an 18g canister containing 200 actuations and is also supplied as an 8g canister containing 60 actuations.
The doctor wants the patient to use 60 inhalations and, in turn, the pharmacist will dispense Ventolin HFA 8 grams.
So, the total quantity to be dispensed is 8 g
The sig says: inhale 2 puffs by mouth 15 to 30 minutes before exercise
Let's assume that the patient exercises once daily. Then, the patient will use 2 puffs daily.
The total days supply will be 60 divided by 2 which is 30 days.
What are the total quantity and the total days supply for the following Rx:
Dulera 100
2 puffs bid x 3 mon
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The doctor has prescribed the brand-name drug Dulera 100 mcg/5 mcg oral inhalation. Dulera is a HFA inhaler and it is a metered-dose inhaler providing 120 actuations.
The sig says: inhale 2 puffs by mouth twice daily
The patient will inhale 4 puffs per day. We know that one inhaler provides 120 inhalations. If we divide 120 inhalations by 4 puffs, then one inhaler will last 30 days.
In turn, if one inhaler lasts 30 days, then three inhalers will last 90 days.
The doctor wants the pharmacist to dispense enough medicine for 3 months, that is, for 90 days. In this case, the pharmacist will dispense 3 inhalers.
Also, we know that one inhaler has 13 grams of medicine. Now, if 1 inhaler has 13 grams, then 3 inhalers have 39 grams of medicine.
In turn, the total quantity to be dispensed is 39 grams.
The total days supply is 90 days as stated by the doctor.
It is worth noting that some insurance companies may not want to pay for 3 inhalers all at once. In turn, the patient may have to get 1 inhaler now and 2 inhalers in the next two months.
In this case, the total quantity prescribed will be 39 grams, but the total quantity dispensed will be 13 grams and the total days supply will be 30 days.





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2006