A woman who said she had a gun demanded a powerful painkiller from a pharmacy Friday but was arrested shortly after running off with the drugs, Suffolk police said.

She told an employee at Islip Pharmacy on Main Street that she had a gun and wanted OxyContin, an addictive painkiller, police said. The robbery happened about 2:20 p.m., police said.

But a short time later, officers arrested the woman in her car on Union Boulevard and Champlin Avenue in East Islip, police said.

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No gun was found at the time, police said.

Police on Friday night declined to release her name and charges.