Many of the substances prohibited today were legally available in the past. Some of the pictures are oversized to improve legibility.
Additional photographs are available for some products in the author's private collection.
For a quick comparison with current drug regulations, see Drug Schedules . Some of these companies are prominent companies today manufacturing and distributing well-known consumer products. The incorporation of potent psychoactive substances in a company's product line was common practice during the 19th and early 20th centuries. This was before the deleterious effects of habitual use of these substances was widely recognized. The prohibition of psychoactive substances has evolved gradually in the United States and in Europe.