Okla. Stat. tit. 21, § 861

Every person who administers to any woman, or who prescribes for any woman, or advises or procures any woman to take any medicine, drug or substance, or uses or employs any instrument, or other means whatever, with intent thereby to procure the miscarriage of such woman, unless the same is necessary to preserve her life, shall be guilty of a Class D1 felony offense punishable by imprisonment as provided for in subsections B through F of Section 20N of this title.