I make to understand that you want to reduce your weight and that is why your friend is recommending the product "Leisure 18, Slimming Coffee". The Food and Drug Administration of US Govt. says that this product contains sibutramine
. Sibutramine is a controlled substance and has been removed from the US market for safety reasons as it is known to increase blood pressure and/or pulse rate.
I suggest that you seek professional advice rather than taking products on the recommendation of friends or lay press.
Wishing you the best.