(Gettysburg) -- A Maryland woman faces charges of aggravated assault and endangering the welfare of children after police say she poisoned her young sons with Visine.  

State police in Gettysburg have arrested 23-year-old Samantha Unger of Thurmont after she told them she put eye drops into drinks for her three-year-old and that her one-year-old got sick by drinking them accidentally.

A police affidavit says both children became sick this spring, and the older boy required hospitalization.

Doctors at Penn State Hershey Medical Center in Dauphin County suspected poisoning, and tests found the drug in the three-year-old's urine.

Unger lived in Orrtanna, Adams County, at the time, before moving to Thurmont.

A judge had set bail at $50,000 about two weeks ago.