I was diagnosed with migraine & currently using some preventive medications since last november.how long will i have to continue these medications.

Depends: It really depends on how often you get migraines and your exposure to the triggers of the migraines. You may want to consider seeing a doctor that is specialized in trudenta. Most patients can be treated for migraines without any medications or surgery. Go to www.Trudenta.Com to find a provider in your state.

Individual diff.: If your preventative meds have either sharply cut down or eliminated your migraines in the past 3 months, you could likely slowly taper the dosage. If the effect has been minimal or without benefit, could try a different approach, such as botox. Maybe long-term otc preps would fit you better, such as riboflavin, butterbur, co-q10, magnesium? Have some of the trigger events been addressed?