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Both the medicines are given for different purpose. Clomiphene
is given to induce ovulation in woman who is not ovulating. It is usually given from day2 -day 6. while duphaston
is usually given in last 15 days to support the pregnancy
if fertilization occurs or to get periods when patient is not ovulating. Its safe if you take together but it wont be required to take both the medicines same day. In same cycle both can be taken .Take care.