Ingredient in Speed/Ice.
Used to be in Vick's Inhaler's, can now be obtained pure to make homemade shit.
"Ever wonder why someone would need to buy 24 Vick's Inhaler's at 4:00am. I tell you, they don't have a cold."
A nasal decongestant, also used in the manufacturing of methamphetamine, and methcathinone. Sold in OTC meds,
It is illegal to buy pseudo-ephedrine in mass quantities in the US.