Muscle shaking, insanely painful cramps, wild heartbeat - and I was taking "only" 60-80 mcg/day. After two weeks I threw the remaining pills into a garbage can. Never more!
I love CLEN too. Ive seen it strip fat off numerous clients and myself. Most of the bad press comes from too large of amounts.
Some of the studies used MG amounts and we (people) only need MCG amounts.
Some people react to different drugs in different ways. If I took too large of a dose of clen I'm pretty certain I would end up in the ER and possibly the morgue. Clen doesn't like me.
On the other hand I can take large amounts of nolva and taper down to stay on for many months and not get a single adverse side. But from listening to a lot of people on EF, you'd be amazed I haven't died from that!
I think clen has a big potential to be pretty dangerous. If you want to try it, I would recommend starting it off in a very low dose trial period, tapering up the dose to a "cycle dose" and paying attention to how your body reacts, before you attempt to cycle it.