What Diet And Exercise Should Be Followed While On Zerofat Pills?

hi doctor ,
I am a 23 yr old obese female from India ... I have been prescribed zerofat a tablets to be taken one hour before my breakfast and dinner .... I am concerned about weight reducing pills in general .... so what all should I be doing while taking these pills .... any specific diet ? exercise ? swimming ? vitamin tablets ? B complex tablets ? .... when can I be expecting weight loss in me ... months weeks ??? .... please do reply