Answer :
For one day he had to take 2 capsules.
q12h:
q12h means every 12 hours. This is not the same as twice-daily (bid or BD).
Basically it means we have to take the second dose is supposed to be taken 12 hrs. after the time of the first dose.
Given:
The physician has ordered doxycycline 100 mg q12h.
In his hand, he have the 100 mg capsules.
Then, we have to find how many capsules he will take in one day.
So, according to the definition of q12h,
Let use consider if he take the first dose at 8.00 am
Then he will take the second dose at 8.00 pm on the very same day.
So, based on this explanation, he will take 2 capsules per day.
To know more about q12h here
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