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math calculations with Promethazine syrup

What are the total quantity and the total days supply for the following Rx:
Phenergan VC plain
6 oz
1-2 tsp po q6h prn cough
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The doctor has prescribed Phenergan VC plain, but Phenergan has been discontinued and, in turn, the pharmacist will dispense Promethazine VC syrup.
Now, we need to convert 6 oz into mL (milliliters)
1 fluid ounce = 30 mL and, then, 6 ounces = 180 mL
So, the total quantity to be dispensed is 180mL as stated by the doctor.
The sig says: take 1 - 2 teaspoonsful by mouth every six hours as needed for cough
The pharmacist will use the maximum amount of medicine the patient can take per day.
The patient may take 2 teaspoons every six hours, that is, the patient may take 2 teaspoons four times daily. In other words, the patient may take up to 8 teaspoons daily.
We know that 1 tsp = 5 mL and, then, 8 tsp = 40 mL
So, the total days supply will be 180 mL divided by 40 mL which is 4 days.
What are the total quantity and the total days supply of the following Rx:
Promethazine VC w/ Codeine syrup; #8 oz; Sig: 1 q4-6h prn c
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The doctor has given 8 oz and, now, we need to convert 8 fluid ounces into milliliters (mL)
1 fl oz = 30 mL and, then, 8 oz = 240 mL
So, the total quantity dispensed is 240 mL as stated by the doctor.
The sig says: take one teaspoonful by mouth every 4 - 6 hours as needed for cough
Now, we need to know how much medication the patient takes daily.
The most medication the patient may take is one teaspoonful every 4 hours, that is, the patient can take one teaspoonful six times daily.
Since 1 tsp equals 5 mL, the patient can take 5 mL * 6 which is 30mL daily.
So, the patient may take up to 30 mL per day.
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:
Phenergan VC codeine
4 oz
1 tsp q6h for cough and congestion
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The doctor has prescribed Phenergan VC with codeine syrup, but Phenergan has been discontinued and, in turn, the pharmacist will dispense Promethazine VC with codeine syrup.
We know that 1 oz = 30 mL and, then, 4 oz = 120 mL
So, the total quantity is 120 mL as stated by the doctor.
The sig says: take 1 teaspoonful by mouth every six hours for cough and congestion
Notice that 1 tsp = 5 mL
So, the patient will take 5 mL every six hours, that is, the patient will take 5mL four times daily. So, the patient will take 20mL per day.
The total days supply will be 120 mL divided by 20 mL which is 6 days.





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2006