Updated

The Missouri governor and attorney general want to make Missouri the third state to require a doctor's prescription to buy cold and allergy medicines that can be used to make the illegal drug methamphetamine.

Gov. Jay Nixon and Attorney General Chris Koster announced their support on Tuesday for legislation imposing a prescription mandate on medicines containing pseudoephedrine, which is sold under brands such as Sudafed, Claritin-D and Aleve Cold & Sinus.

Missouri for years has led the nation in busts of methamphetamine labs, even while enacting increasingly stricter laws.

Proposals to require prescriptions for the medication have been rejected in the past by the Missouri Legislature and face opposition from the pharmaceutical industry. But Nixon and Koster say more safeguards are needed.