I strongly recommend doing your research before attempting this.
By this I mean bioavailability, getting a comparison of peak plasma levels between oral and IV administartion, and reading through subjective effects IV'd compared to consumed orally.
You know, chart out the course, foresee and navigate around obstacles.
One thing I will say is to keep your dose below 50mg for your first attempt.
tell us how it went also i'm interested in hearing this
you should start rolling as soon as u finish injecting before you even remove the needle
be sure to tell us your body weight, height and whether or not you work out or lead a healthy lifestyle
and also tell us how high of a dose you took and how strongly it affected you and whether or not you think it was a good does or if you should have went lower or higher
I would urge you to check out the various threads available regards IV mdma so you can get a variety of opinions and then make your decision from there.
Im pretty sure there is some HR info available in there also to ensure you do the least ammount of damage.
Taking into consideration the risks associated with injecting stims and using a needle correctly/safely and monitoring your dose = Safest way to go along the injecting path, if that is what they wish.
plugging has an almost equivalent level of bioavailability compared to IV administration. if your just looking to get the most out of your mdma, you might want to consider plugging instead.