Kratom extract is one of the most effective and pleasurable psychoactive herbs available. The effect last up to 6 hours. In low doses it induces mild euphoria and reduces fatigue. There are several ways of taking kratom. In traditional use the dried leaves are smoked, chewed, made into tea or made into an extract. It has been used since hundreds of years as a substitute for opium. A small minority of users use kratom to prolong sexual intercourse.