HARRISBURG — Gov. Tom Corbett is changing his position on medical marijuana and now is backing the legalization of a marijuana extract to treat severe seizures in children.

Corbett’s office confirmed today that the Republican governor is meeting with several parents to tell them about his decision.

Corbett had been under pressure from parents who believe the oil extract, called cannabidiol, can save the lives of their seizure-wracked children. Democrats running to challenge Corbett in the fall election also favor the legalization of medical marijuana.

Corbett spokesman Jay Pagni says the governor’s plan will need approval from the Legislature. He says cannabidiol would be dispensed by research-based hospitals with medical professionals who are experienced in treating children with severe seizure disorders.