One of the original ingredients in Coca-Cola was cocaine.
Coca-Cola was originally marketed as a cure-all, which supposedly treated such conditions as headaches, impotence and morphine addiction, among others. In the late 19th century, it was not uncommon for trace amounts of cocaine to turn up in medically dubious tonics and potions. As such, the product was named for kola nuts and extract of coca leaves, the two ingredients that were considered "medicinal" at the time.
SOURCE: Cocaine-Cola | Snopes.com