I take Gaba to ameliorate akathisia otherwise caused by APs and it also turned out to act as an AD in me even though I did not begin using it for that purpose. I am currently on 900 mg but I have been at 1800 mg. And I have a neurologist who manages my migraines and who uses Gaba in his patients with other neuro conditions. He told me he prescribes as much as 4500 mg without any ill effects (and the FDA-approved max is 3600 mg). Gaba is really a unique medication that does not get metabolized, that does not interact much with anything else. It is a godsend. If it helps you, take more of it.