Drotaverine

Drotaverine (INN, also known as drotaverin) is an antispasmodic drug, used to enhance cervical dilation during childbirth.

It is structurally related to papaverine, is a selective inhibitor of phosphodiesterase 4, and has no anticholinergic effects.

It is available in Asian and Eastern European countries under several brand names, with No-Spa being one of them.