Struggling to lose weight

I am one of those people who are struggling to lose weight. I used to have a skinny body before I give birth and I have been wishing to gain few kilos that time. And this wish was granted when I give birth to my son to the point that I need to buy new clothes because my old clothes doesn’t fit me anymore. But now, that I gain way too much for my wish weight I am starting to find effective diet pills for me. I need to be sure that the pill I am taking is safe for my health too.