Is it ok to take 2-25 mg. alprazolam at the same time if you usually take one at one time, one at another time?

I hope you have forgotten a decimal point in your dosage.

The half life of aprazolam is about 11 hours and I don't know anything about why or how it's prescribed for you.

Generally, the answer would be "NO."

But call any pharmacist to help you assess the risks.