This also depends on body weight. For best results, I'd suggest combining Hydergine with Piracetam. They have a synergistic effect, so you need less of both than each one taken alone, and the effects will be stronger. If you'd like to try this combination, I'd suggest taking 800mg Piracetam 3 times a day and 2.25mg Hydergine 2 times a day. These numbers are just rough averages based on what users have told me.
Every person has one's own personal optimal dose, which can vary a lot from the amounts above.
Hope this helps, good luck.