Tolfenamic acid (Clotam) is a member of the anthranilic acid derivatives (or fenamate) class of NSAID drugs discovered by scientists at Medica Pharmaceutical Company in Finland. Like other members of the class, it is a COX inhibitor and prevents formation of prostaglandins.
It is used in the UK as a treatment for migraine. It is generally not available in the US. It is available in some Asian, Latin American and European countries as a generic drug for humans and for animals.
^ abNIH LiverTox Database Mefenamic Acid Last updated June 23, 2015. Page accessed July 3, 2015. Quote: "(fenamates generally not available in the United States, such as tolfenamic acid and flufenamic acid)"