I am used ferrous sulphate folic acid tablets(large) composition:dried ferrous sulphate ip335 mg,equivelent element iron 100mg ,folic acid500 mg twice a day, now ferrous furmarate&folic acid tablets bp,ferrous furmarate ip 152 mg, equvalent element 50 mg iron folic acid 1500 mcg tablet tell me a diffrent &dossage