Firstly these tablets may give you diarrohea, did to our friends we advised to stop taking them, they did and so did the "runs", make yourown mind up after taking for a few days. I have been going to India for over 20 years and never have taken them, its usually cautious first time travellers, but there is nothing wrong in being cautious.
Re money, we were refused exchange on some notes in Poona because there was writing/ numbers written in ball pen on them and they only wanted clean notes in a branch of Thomas Cook [ who incidently really screw you on the exchange rates].
have a good trip.