OKLAHOMA CITY (AP) - Two Oklahoma lawmakers have filed a friend-of-the-court brief defending a state law regulating abortion-inducing drugs that was struck down as unconstitutional.

State Reps. Pam Peterson of Tulsa and Rebecca Hamilton of Oklahoma City filed the document Tuesday in the state Supreme Court, where the ruling that struck down the law was appealed.

The law was passed by the Legislature in May 2011. It required doctors to follow strict guidelines authorized by the U.S. Food and Drug Administration and prohibited off-label uses of drugs such as RU-486.

It also prohibited changing a recommended dosage or prescribing it for different symptoms than the drug was initially approved for.

Peterson and Hamilton say they believe the law is a reasonable way to ensure the health and safety of women seeking chemical abortions.