Hello,as you've mentioned you are losing hair in circular manner it may be alopecia areata which is an autoimmune disease but it's difficult to diagnose for me as there is no photo attached. Just notice if there are grey hairs developing mainly on those areas. Medicines are fine, it takes time to see visible result. You need hair mesotherapy or PRP or enzymatic injection to see the visible result.

You need hormone therapy..u are suffering from hormonal changes causing Androgenetic alopecia causing hair fall. It's completely stoppable even regrowth of hair is possible with certain medications without any side effects. Treatment depends on the grade of hair loss. So, it's a must for diagnosing which grade, you are in for an effective treatment. Please meet me in my clinic or do direct personal online consultation by sending photos for accurate diagnosis and proper treatment.