(NET) A progestogen of a type weakly related to the male hormone testosterone. Progestogens of this class are commonly found in the oral contraceptive pill. Norethisterone acetate is marketed as Primolut N and is made by Schering. Called norethindrone in the US.

The progestogen norethisterone acetate (UK, Australia) or norethindrone acetate (US) made by Schering.

A progesterone-like substance, usually more active when given by mouth than natural progesterone is. Used with an estrogen in the birth control (oral contraceptive) pill. Commonly used examples have a structure like progesterone itself (e.g. medroxyprogesterone acetate, or Provera; cyproterone acetate, or Androcur) or have a structure distantly related to the male hormone testosterone (e.g. norethisterone, or Primolut N; norgestrel)