Welcome to healthcare Magic!
You are unable to talk normally after taking the Brahmi
vati gold is indicative of the adverse effect of the drug and is a straight forward indication that you should discontinue it's use.
There is no medicine that can make your brain sharp.
A regular lifestyle, balanced diet and moderate exercise can help you the most if you can ensure regularity on all fronts.
I hope the advise would be informative and useful for you.