What Are The Side Effects Of Etosys Tablets?

My daughter , 10.5 years is having a second period cylcle and one of the gynacologists has advised her to take etosys tablets thrice a day. She is having stomocahce and excessive bleeding for almost 7 days now. please advise as below. why etosys tablet is used does it have any side effects for a girl of 10.5 years old. thanks, Rajesh Delhi