It's not on shelves because it's a precursor chemical to actual meth manufacturing, not because it's a dangerous drug (otherwise it'd be Rx-only, like the other meth-like drugs).
Neither ephedrine, pseudoephedrine, or phenylpropanolamine are the reversed-chirality methampetamine. "Regular" methamphetamine is dextromethamphetamine; the other version is levomethamphetamine.