Tried every method to increase my breast milk.but failed.i have intense desire to feed baby at least till 2 year.is there any safe medication for long term use to increase my breasrmilk?

A medication class called lactogogues can modestly increase breast milk production, however their use is NOT recommended even short-term due to potentially serious side-effects. That being said, you haven't mentioned a few things: how old is your baby now? Have you met with a lactation consultant yet? Do you have any other children who you breastfed and if so, how long did you breastfeed them?