# Thread: Question Regarding Calculation

1. Good post? |

## Question Regarding Calculation

A prescription for alomide reads as follows
Alomide 0.1 &#37; eye drops
Sig: 2 gtts ou qid X 30 days
How many milligrams of alomide are present in per day dose of the drug?
I thought
per day 16 drops.
1ml =20 drops
? 16 drops so it would be 0.8 ml

drug is 0.1%
100-------------0.1
0.8-------------?
So I got the answer as 0.8 mg
But the answer given in the book is 1.6 mg.
Please correct me If I am wrong?
Thank you
Kpharma

2. Good post? |
I tried that calculation, and I came up with 0.8mg/day as well. the only possible way I can think of getting 1.6 is if they thought there were 10 drops/mL, but that does not make any sense. Is it possible that the book is wrong?

3. Good post? |
Where is the 20 drops/ml coming from? I thought it is 25 drops/ml.

Anyway, I did not have 1.6 mg.

4. Good post? |
It is because you are giving drops in both eyes so 0.8x2.
By the way, where are you studying the calculations from? I am trying to use APHA but it is such a mess, I'm lost! Particularly the beginning of the chapter about kinetics.
Can you answer me please?

5. Good post? |
Hi,
I don't think you can again multiply it by 2, because 16 drops is for both the eyes. Please correct me if I am wrong.

6. Good post? |
Originally Posted by lol5561
Hi,
I don't think you can again multiply it by 2, because 16 drops is for both the eyes. Please correct me if I am wrong.
I Agree with LOl. if you typed the problem correct it should be 0.8
and elieve me some times the answers are wrong, thats why they some up with new ed. to the book :P

7. Good post? |
Sorry my bad, you're right.

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