A measure designed to tighten the sale of pseudoephedrine passed the Iowa House Monday by a unanimous vote.
The drug is commonly found in cold medicine but is also a key ingredient in methamphetamine.
Under the measure, customers are limited to purchasing 3,600 milligrams of pseudoephedrine in a 24-hour period. They also must sign an electronic log that records the purchase, a move aimed at building a registry where authorities can keep track who is buying the drug.
Customers now must sign a paper log.