Medications containing pseuduoephedrine sit on a store shelf in Midwest City, Okla. Oklahoma authorities have been at the forefront of the nation's battle against methamphetamine, but they will soon have a tough new opponent: the politically connected, well-heeled pharmaceutical industry. At issue is a proposal to require a prescription for certain cold tablets containing pseudoephedrine, which is used to make meth. Prosecutors say the measure is essential to controlling the meth trade. Drug companies are eager to keep their pills on store shelves.