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math calculations with elixir

What are the total quantity and the total days supply for the following Rx:
Levsin elixir
1 tsp po tid 30 minutes before meals
disp: qs for 10 days
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The doctor has prescribed Levsin elixir, but most pharmacists will dispense the generic version Hyoscyamine elixir.
The total days supply is 10 days as stated by the doctor.
The sig says: take 1 teaspoonful by mouth three times daily 30 minutes before meals
The patient will take 5 mL three times daily, that is, 15mL per day.
In this case, the patient will take 15 mL daily for 10 days, that is, 150mL total.
So, the total quantity to be dispensed is 150 mL
What are the total quantity and the total days supply for the following Rx:
Trihexyphenidyl 2mg/5mL
6 mL bid
60 days supply
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The doctor has prescribed the generic drug Trihexyphenidyl elixir.
The sig says: take 6 mL by mouth twice daily
The patient will take 6 mL twice daily, that is, 6 mL * 2. In other words, the patient will take 12 mL per day.
The doctor wants the pharmacist to dispense enough medicine to last 60 days.
In turn, the total quantity to be dispensed will be 60 * 12, that is, 720mL
The total days supply is 60 days as stated by the doctor.
What are the total quantity and the total days supply for the following Rx:
Artane 2mg/5mL
6 mL po bid
1 month
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The doctor has prescribed the brand-name drug Artane 2mg/5mL, but Artane has been discontinued. In turn, the pharmacist will have to dispense the generic version Trihexyphenidyl 2mg/5mL
The sig says: take 6 mL by mouth twice daily
The sig directions imply mL, that is, liquid. Then, the pharmacist will have to dispense Trihexyphenidyl elixir.
Now, the patient will take 6 mL * 2, that is, the patient will take 12 mL per day.
The doctor wants the pharmacist to dispense enough medicine to last 30 days.
Then, the total quantity will be 12 * 30, that is, 360 mL
The total days supply will be 30 days as stated by the doctor.
It is worth noting that Trihexyphenidyl 2mg/5mL is the same as Trihexyphenidyl 0.4mg/mL
What are the total quantity and the total days supply for the following Rx:
Donnatal 8oz
2 tsp tid for abdominal cramps prn
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The doctor has prescribed Donnatal elixir, but the pharmacist will very likely dispense the generic drug Belladonna Alkaloids with Phenobarbital elixir. On the other hand, some pharmacists may dispense the generic drug RE-PB Hyoscyamine elixir.
The doctor wants the pharmacist to dispense 8 ounces, that is, 240 mL
In turn, the total quantity to be dispensed is 240 mL
The sig says: take 2 teaspoonsful by mouth three times daily for abdominal cramps as needed
Remember that 1 tsp = 5 mL
The patient will take 2 teaspoonsful three times daily, that is, the patient will take 2 * 5mL * 3 daily. In other words, the patient will take 30mL per day.
Now, the total days supply will be 240 mL divided by 30 mL which is 8 days.
What are the total quantity and the total days supply for the following Rx:
Lortab elixir
8 mL po q4h prn pain
240 mL
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The doctor has prescribed the brand-name drug Lortab elixir, but the pharmacist will very likely dispense the generic version hydrocodone/apap elixir. On the other hand, some pharmacists may dispense the generic version hydrocodone/acetaminophen oral solution.
The total quantity is 240 mL as stated by the doctor.
The sig says: take 8 mL by mouth every four hours as needed for pain
The patient will take 8 mL six times daily, that is, 48mL per day.
So, the total days supply will be 240 divided by 48 which is 5 days.
It is worth noting that Lortab is considered a C-III drug.
Calculate the total quantity and the total days supply for the following Rx:
Lortab elixir
take 5 mg po q8h prn pain
disp: 50 mg (fifty)
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The doctor has prescribed Lortab elixir, but the pharmacist will very likely dispense the generic version hydrocodone/acetaminophen 7.5mg/500mg/15mL elixir.
The sig says: take 5 mg by mouth every eight hours as needed for pain
Notice that the doctor says for the patient to take 5 mg, but this medicine is in a liquid form.
So, we need to convert 5 mg into milliliters. In this case, we need to use the ratio 7.5mg/15mL
Notice that 7.5mg/15mL is the same as 15mL/7.5mg
x / 5 mg = 15 mL / 7.5 mg
x = (5mg * 15mL) / 7.5mg
x = 75 / 7.5
x = 10 mL
Now, we need to rewrite the sig directions. So, the final sig will say:
take 10 mL by mouth every eight hours as needed for pain
In turn, the patient will take 10 mL every eight hours, that is, the patient will take 10mL three times daily. In other words, the patient will take 30mL per day.
Now, the doctor wants the pharmacist to dispense the quantity of 50mg
But, we need to convert 50 mg into milliliters. In this case, we need to use the ratio 7.5mg/15mL
x / 50 mg = 15 mL / 7.5 mg
x = (50mg * 15mL) / 7.5mg
x = 750 / 7.5
x = 100 mL
So, the total quantity to be dispensed is 100 mL
Now, the total days supply will be 100mL divided by 30mL which is 3 days.
What are the total quantity and the total days supply for the following Rx:
lortab 33.3mg/0.5mg/mL solution
2 mL q4h
qty: 120 mL
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The doctor has prescribed the brand-name drug Lortab elixir, but the pharmacist will very likely dispense the generic version hydrocodone/apap 7.5mg/500mg/15mL elixir.
On the other hand, some pharmacists may dispense the generic version hydrocodone/acetaminophen 7.5mg/500mg/15mL oral solution.
Notice that Lortab 33.3mg/0.5mg/mL is the same as Lortab 0.5mg/33.3mg/mL
Now, let's prove that Lortab 0.5mg/33.3mg/mL is the same as Lortab 7.5mg/500mg/15mL
If we divide 7.5mg/500mg/15mL by 15 across, then we get 0.5mg/33.3mg/mL
Now, the sig says: take 2 mL by mouth every four hours
The patient will take 2 mL six times daily, that is, the patient will take 12mL per day.
The total quantity to be dispensed is 120 mL as stated by the doctor.
The total days supply will be 120 divided by 12 which is 10 days.
It is worth noting that Lortab is considered a C-III drug.
What are the total quantity and the total days supply for the following drug:
Benadryl elixir 12.5mg/5mL
disp: 4 oz
1 tsp po q 6 h prn rash/itching
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The doctor has prescribed Benadryl 12.5mg/5mL elixir, but some pharmacists will dispense the generic version Diphenhydramine 12.5mg/5mL oral solution while other pharmacists will dispense the generic drug Q-dryl 12.5mg/5mL elixir. Also, some pharmacists may dispense the generic drug Diphenhist 12.5mg/5mL oral solution.
The doctor wants the pharmacist to dispense 4 fluid ounces, that is, 120 mL
So, the total quantity to be dispensed is 120 mL
The sig says: take 1 teaspoonful by mouth every six hours as needed for rash/itching
The patient will take 5 mL every six hours, that is, 5 mL four times daily.
In other words, the patient will take 20 mL per day.
The total days supply will be 120 divided by 20 which is 6 days.
It is worth noting that Benadryl is an over-the-counter medication. But, the pharmacist may very likely dispense from within the pharmacy because some insurance plans such as Medicaid will pay for the medication.
What are the total quantity and the total days supply for the following Rx:
Decadron
1 tsp qid x 4 doses
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The sig says: take one teaspoonful by mouth four times daily
Since the patient has to take one teaspoonful, we can state that this drug is in the liquid form. In turn, the doctor has prescribed Decadron 0.5mg/5mL elixir, but Decadron has been discontinued. As a result, the pharmacist will dispense the generic version Dexamethasone 0.5mg/5mL elixir.
The sig says: take one teaspoonful by mouth four times daily
The doctor has indicated four doses, that is, the patient will take one dose four times daily for a total of four doses.
Notice that one dose is one teaspoonful.
In this case, the patient will take one teaspoonful four times daily, that is, the patient will take 5mL four times daily.
In other words, the patient will take 5mL * 4, that is, the patient will take 20mL total.
In turn, the total quantity to be dispensed is 20 mL
The total days supply is 1 day because the patient will take all four doses in the same day, that is, the patient will take all four teaspoonsful in the same day.





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2006