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PTCB Practice Question

A prescription is written for a hydrocortisone 5% in zinc oxide compound. The total quantity to be dispensed is 50 g. On stock you have 50 mg of hydrocortisone tablets.

How many hydrocortisone 50 mg tablets will you need to triturate for this compound?

The answer is 50 tablets, but what is the formula you use to get the answer on these problems?


Comments for PTCB Practice Question

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by: Anonymous

The correct answer is 1000 tablets. Double check to see if that's one of the answer choices.


You need to dispense 50g of hydrocortisone. There are 50,000mg in 50g. In stock, one tablet has 50mg. 50,000mg ÷ 50mg = 1,000 tablets.

1(tab)/50mg = x(tab)/50,000mg
1*50,000 = x*50
50,000 = x50
50,000 ÷ 50 = x50 ÷ 50
1,000 = x

You need 1,000 tablets

50,000mg ÷ 1,000tab = 50mg per tablet

50,000 = 50g

the answer is 50 tablets
by: NY

The answer is 50 tab.
The amount of hydrocortisone in 5% zinc oxide compound 50g is 2.5g.
(5g:100g=2.5g:50g or 50gx0.05=2.5g)

isn't the answer 100 tablets?
by: Anonymous

In sorry but isn't the prescription asking for 5% hydrocortisone to be added to the zinc compound and that the total weight would be 50g. So wouldn't the answer be 100 tablets?

2nd answer is correct
by: Dang

Answer 2 is correct, because it is asking for 5% of hydrocortisone inside a 50g compound of both zinc and hydrocortisone therefore 50g x 5% = 2.5g

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