Could Confusion In A Person Be Due To The Side Effects Of Rcinex?

My father is on ATT medication for about 5 months, from a couple of months there has been a change in his mental behavior. He seems confused of the place and time, and does not seem to understand no matter how many times we tell him.

I have read online of the side effects of Rcinex 450 mg include Confusion.

Can his condition be reversible ?