I believe the original poster is referring to
MEPHEDRONE also known as 4-METHYLMETHCATHINONE (4-MMC) or sometimes mKat or even 'meow meow'
I used mephedrone extensively in 2009 before the ban. The high lasts about 30 minutes to an hour (maybe even an hour and a half) and is quite good. Mephedrone is not really empathogenic as MDMA. It is very speedy. It has a mild comedown. Duration can be easily extended by redosing, though some really got REALLY carried away with that and ended up doing like 10 grams in one session. Extreme vasoconstriction, causing some users' knees for example to turn blue, was not unheard of, but it never happened to me. The most I ever did in one session was 3 grams, and that was probably a bit too much. 4-MMC realeases copious amounts of serotonin aka 5-HT (5-hydroxytryptamine)
5-HYDROXYTRYPTAMINE aka 5-HT aka SEROTONIN
like MDMA, but also releases much larger amounts of
DOPAMINE abbreviated DA
than MDMA. Compulsion to redose is quite strong. The drug is very pro-sexual, though its stimulatory nature may make getting an erection difficult if not impossible. The reason meph doesn't last nearly as long as
ICE METHAMPHETAMINE
is that it's carbonyl functional group is quickly metabolized by the enzyme, cathinone reductase, to the ephedrine like
4-METHYLEPHEDRINE
I think meph is great, but haven't run across any in ages and would probably stick with ice methamphetamine if I had to choose between the two based on the extreme difference in the duration of the highs.
Eventually, mephedrone gets metabolized all the way to
2-AMINO-1-(4-CARBOXYPHENYL)-PROPAN-1-OL
in case you're interested. Some people report magical results after shooting 500mg at a time. Mephedrone is a worthy drug and should be tried if you're into stims if you ever run across it.