Fastin was introduced in the marketplace by SmithKline Beecham and contained a generic Phentermine. It was used as an appetite suppressant and was approved by the FDA. It was removed from the market in 1988 but no reason was given. Another product of a similar nature showed up shortly thereafter – Fen Phen. This drug also had to be removed from the marketplace due to users showing elevated blood pressure and damage to heart valves.