Hormonal alopecia or male pattern hair loss the main culprit is testosterone acting on hair follicles which leads to thinning and eventual bald patches So to counteract the effect we need some anti androgen specifically counteracting the effect on hair follicle without affecting other functions That’s finasteride You have to take it till you have to maintain the results There are other treatment as well like PRP , mesotherapy which helps

It depends on the grade and severity...You 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  send photos of your head, by direct online consultation for accurate diagnosis and proper treatment.