I've got twin brain, so their first year was a blur. I think I started using it at about 6 months of their life. I tw as just SO discouraged by my lack of progress with pumping, so I decided to bite the bullet and just try it. I seem to recall that my pumping output increased by at least 50% (I pumped at work and nursed at night) and the direct nursing was much more pleasant -- I just hated that "dry nursing" raspy tongue feeling.
I started with 60 mg, was on a max of 100 mg daily. Now I'm down to 20 mg (at 20 months), and am so glad that it was available for me to use.
I would recommend you try it, if everything else has failed. I think it can definitely improve the breastfeeding relationship in the right circumstances.