Defense attorney Carrie Apfel said the Apothecary Shoppe "has agreed that it will not prepare or provide pentobarbital or any other drugs for use in the execution of Michael Taylor," St. Louis Public Radio reported.
Apfel said the pharmacy and the inmate came to an agreement before a review of the matter ordered by a federal judge last week could take place, the radio station said.
Apfel said the Apothecary Shoppe had not sold any drugs to the Missouri Corrections Department for Taylor's execution.
The pharmacy, which had sold the state pentobarbital for three previous executions, could not be reached for comment, St. Louis Public Radio said.
Missouri has another option to carry out executions, the radio station, noting a state official revealed in a sworn deposition last month the state has a supply of midazolam it could use. That drug was used in a recent execution in Ohio that witnesses said left the inmate gasping and snorting for more than 20 minutes before he died.
Taylor is to be executed on Feb. 26 for kidnapping, raping and fatally stabbing a 15-year-old girl.