Papaverine belongs to the active substance group of vasodilatative antispasmodics. As a cAMP phosphodiesterase inhibitor (PDE inhibitor), it has an antispasmodic effect on smooth muscles. Usage Papaverine is a natural compound found in the milky sap of opium poppies. The active ingredient is mainly used in heart surgery. Papaverine prevents blood vessel spasms when removing… Continue reading What is Papaverin and how to use for ED treatment