https://en.wikipedia.org/wiki/Obetrol came before Adderall

Obetrol was the brand name of a drug combining several amphetamine salts indicated for the treatment of exogenous obesity.

The original formulation of amphetamine mixed salts that included methamphetamine was approved by the U.S. Food and Drug Administration (FDA) on January 19, 1960, under the name Obetrol. Indicated for exogenous obesity,

In 1970 the FDA issued an order requiring new drug applications for previously approved amphetamine products. The FDA was critical of combinations of amphetamines and non-amphetamines, but also considered amphetamine and methamphetamine mixtures a combination drug, and required the ingredients to be effective and safe individually and in combination. In September 1973 the FDA withdrew approval for Obetrol under the FDA Drug Efficacy Study Implementation program.

Because FDA considered combinations of amphetamine and dextroamphetamine salt a single entity, Rexar simply reformulated Obetrol to exclude methamphetamine salts and continued to sell this new formulation under the same Obetrol brand name. This new unapproved formulation was later rebranded and sold as Adderall by Richwood after it acquired Rexar resulting in FDA warning in 1994. Richwood resubmitted this formulation as NDA 11-522 and Adderall gained FDA approval for the treatment of attention-deficit/hyperactivity disorder on February 13, 1996.

There’s no meth in Adderall but this is where the confusion probably comes from.