Suggest Medication For Recurring Migraine Headache

Hi I am Rahul, I have been suffering from migrane attacks since I was 13-14 years, Now I am 29. previously i used to get migrane every 3 to 4 months. of the it has increased in frequency, evry 10 to 12 days intensity of pain is less though. but i take Dart it relives in 3-4 hrs time. i am worried about too much intake of DART avg of 3-4 a month. is it fine. or do you suggest an alternative.