Suggest An Alternate To Dronis 20

i have problem of irregular period for the last 2-3 months because of an i pill...now my doctor has presccribed meprate 10 mg n after dat dronis 20...but jus now i read dat dronis 20 has side effects of wieght gain...so i m afraid of it ..so could u please prescribe some other medicine..
i am a mother of 3 n my age is 30 n weight 70 kg n height 5.3