Papaverine is a natural substance that is extracted from the seeds of the opium poppy plant. This alkaloid is widely used in medicine to treat various conditions, including spasms in the intestines, urinary tract and blood vessels. Other synonyms for papaverine include benzylisoquinoline, opianin and sternopine. Additionally, some of the brand names for medications containing papaverine as an active ingredient include Pavacol-D, Papaver and Regitine. It is important to note that while papaverine has therapeutic benefits, it is also a controlled substance due to its potential for abuse and addiction. Therefore, it should only be used under the guidance of a qualified healthcare professional.