K.I.
This is a question for his doctor!
My sister has high BP & takes meds (at night) & in the beginning they made her very tired, I believe that is why she was instructed to take the meds at night? After the first week or two the fatigue decreased.
The doctors want to monitor him for a month for a reason, I suggest you do not deviate from directions on his Rx without first talking to his doctor.