i have the same kind from china it should say on the back the following " all this are on it..
CLENBUTEROL 0.04 in blue color writing
Clenbuterol hydrochloride 0.04mg in red color writing
Hubei Huangshi Huangshi Co, Ltd in blue color writing.
This is the double dosage of the regular 0.02mg
0.02mg=20mcg
0.04mg=40mcg
It's good stuff, try to cycle it, 2weeks on and 2weeks off...
Sides are tremble of the finger, heart attack, rapid heart rythm, nausea, cramps, i get alot of those...
If used within the limit dosage then sides aren't as bad. unless you are used to it, i would start with 1 tab of 0.04mg/ split it to see your tolerance/effect, and increase it as you feel comfortable, but don't exceed this range > 120mgc, could lead to worse sides, just my 2 centavos...