Papaverines are a class of alkaloids found in opium poppies that are used in the pharmaceutical industry to treat various medical conditions. These alkaloids are commonly used in the treatment of smooth muscle spasms, as they have the ability to relax the muscles. Synonyms for papaverines include benzophenanthridines, protopines, and isoquinolines. Other related compounds that fall under the same class include noscapine and narcotine. While papaverines are derived from natural sources, they can also be synthesized artificially for medical use. Due to their pharmacological properties, papaverines have been used in the treatment of digestive disorders, pulmonary hypertension, and erectile dysfunction.