Earlier quoted context omitted.
Not necessarily. Pharmacies have arbitrary power. My doctor gives me a three month prescription for a scheduled substance and I've had a couple pharmacies reject it because it's "sketchy". Of course, they never offer to call my doctor to confirm anything. They just smirk and cross their arms.
Even OTC amphetamines have purchased limits, some imposed by law depending on the state.
Also, I think you mean OTC amphetamine alternatives since amphetamine is sched I.