OKLAHOMA CITY (AP) - Gov. Mary Fallin has signed into law a bill that expands the use of an oil derived from marijuana.

Fallin on Friday signed the bill that expands the medically supervised use of cannabidiol (can-uh-bih-DIE'-all), a non-intoxicating derivative of marijuana. Supporters say the oil effectively treats people who experience epileptic seizures. Previously, its use was limited to children under 18. The bill Fallin signed removes the age restriction.

It also allows its use to treat spasticity due to multiple sclerosis, paraplegia and symptoms of chronic wasting disease.

Last year, Fallin signed legislation authorizing the use of cannabidiol in children, but says she remains opposed to legalizing all medical marijuana.

Meanwhile, medical marijuana supporters have begun a signature drive on a public vote to allow the drug for medicinal purposes.