We did ivf 3 times at india but we are not succecced. how effective is clomid (clomiphene)?

Probably not very: Generally if you were at a good ivf clinic and were not successful after 3 attempts, using Clomid (clomiphene) will probably not be very effective. Although anything is possible, Clomid (clomiphene) is used for ovulation induction and because it works as an anti-estrogen, it might interfere with cervical mucus production and/or the lining of your uterus, actually decreasing pg rates. Good luck.