Papaverine

Papaverine is a benzylisoquinoline alkaloid that relaxes smooth muscle and dilates blood vessels, partly by inhibiting phosphodiesterase enzymes and raising intracellular cyclic AMP.

Phosphodiesterase: A family of enzymes that hydrolyze cyclic nucleotides such as cAMP and cGMP. Papaverine inhibits several phosphodiesterases, slowing cyclic-nucleotide breakdown.
Erectile dysfunction: Persistent difficulty achieving or maintaining an erection sufficient for sexual activity. Intracavernosal papaverine was used to induce penile smooth-muscle relaxation and blood flow.
Benzylisoquinoline alkaloid: A class of plant alkaloids built around a benzylisoquinoline chemical framework. Papaverine belongs to this structurally diverse alkaloid class.
Morphine: A potent opioid analgesic alkaloid found in opium poppy latex. Unlike morphine, papaverine does not produce its effects through opioid receptors.
Georg Merck: A German chemist associated with the isolation of papaverine from opium in the nineteenth century. Merck's work is linked to papaverine's early isolation and characterization.
Cyclic AMP: A cellular second messenger that regulates enzymes, ion channels, and gene expression. Higher cAMP contributes to papaverine's relaxation of vascular smooth muscle.
Intracavernosal injection: Injection of a medication directly into the erectile tissue of the penis. This route delivered papaverine locally for erection induction.
Papaver somniferum: The opium poppy, a plant cultivated for seeds and for alkaloids in its latex. Papaverine occurs among the alkaloids of the opium poppy.
Codeine: An opioid alkaloid used as an analgesic and cough suppressant. Codeine is an opioid, whereas papaverine primarily relaxes smooth muscle.
Opium: The dried latex of the opium poppy, containing multiple pharmacologically active alkaloids. Papaverine was identified among the alkaloids present in opium.

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