The Missouri House has endorsed legislation further limiting sales of pseudoephedrine, a decongestant that's also a key ingredient in methamphetamine.
Missouri now caps purchases of medicines containing the popular cold and allergy medicine at nine grams every month.
Stores in Missouri like Stones Corner Pharmacy in Webb City have to keep the medicines behind counters and keep records of individual purchases.
The House bill that was given first round of approval this week would limit consumers to seven and a half grams a month.
"I think by itself it's certainly not going to make an enormous difference in the meth problem that we have but it is a small deterrence I think in making them work a little harder to obtain substances they are going to use in illegal products," says Chad Isaacs, pharmacist and owner of Stones Corner Pharmacy.
Joplin is one of several communities that have made pseudoephedrine a prescription drug.