The mother and grandmother of two young children who were revived using the opiate antidote naloxone have been charged with felonies in Ohio.

Authorities say doctors revived the 9- and 21-month-old children on Feb. 2 after their mother found them unconscious on the floor in their Warren home and took them to a hospital.

The 18-year-old mother, Carlisa Davis, was indicted Thursday in Trumbull County on two counts of endangering children. She pleaded not guilty and is being held on a $50,000 bond.

The children's grandmother, 43-year-old Lisa Davis, was charged with permitting drug abuse. She pleaded not guilty and was freed on a personal bond.

Court records don't indicate whether the women have attorneys.

Trumbull County has taken custody of the children.