Oh Sergey....
You need a BP Monitor and need to start low and ramp up, like JP said above. My "sweet spot" is 18mg - if you jump right to this and die, don't come bitching to AM
I don't know why you'd mess with cough syrup though - you can get straight Albuterol for research purposes. I understand if you are leery of that route though - some are good, some can probably kill you. The half life is about the same as Ephedrine though, so I'm not sold on the need to do a 'Clen like' 2 on / 2 off protocol - it kept being effective at 8 weeks in the rodent study - same in people? Who knows, but you should notice it not having the same "kick" if you do downgrade. Also 2/4/6/8mg may be just fine, with higher dosages not being any better - I may just be wasting money at 18mg. Mine comes at 6mg/ml and I just went up by 3 until I found what I felt was "best" with the usual "More is better" stupid mentality some of us have, LOL.