It's worthless.
If you want a real amphetamine like buzz that's over the counter, buy a propylhexadrine inhaler (or rather, Benzedrex), its often sold right next to where the Vicky's inhalers containing "l-methamfetamine" are found. Propylhexadrine does stimulate the central nervous system and is quite euphoric and long lasting. You need to break the inhaler open and cut the cotton into little pieces which you then let soak in lemon juice (or some other type of acid) of at least 15 minutes (I've found an hour to be the best amount of time to wait). When the time is up, wring out the cotton of all the liquid, throw it away, dilute the lemon juice/propylhexadrine solution with some water and drink it down. I around 20 minutes you'll start speeding. It's similar to methamphetamine IMO moreso than regular Dextroamphetamine, though its a bit dirtier. However, for harm reductions sake, no matter what, DO NOT SHOOT THE RESULTING SOLUTION. The only reported deaths due to Benzedrex (with propylhexadrine, not amphetamine) were when users extracted propylhexadrine crystals and then injected them.
Also, each inhaler contains 250mg of propylhexadrine, which is approximately equal to around 50mg of Dextroamphetamine (so D-amp is around 5x stronger). If your tolerance is low or non existent, you can easily get two doses out of one inhaler. The main downsides are that drinking this shit down tastes like crap mixed with lavender, and that it causes pretty bad vasoconstriction. However it is a good fall back stimulant and unlike l-methamphetamine and ephedrine, it actually does cause euphoria.