— New York would become the 21st state to allow medical use of marijuana under an initiative Gov. Andrew M. Cuomo will unveil this week.

Cuomo (D) plans to use administrative powers rather than legislative action to allow a limited number of hospitals to dispense marijuana for certain ailments. He will formally announce his plans in his state of the state speech Wednesday.

The New York Times first reported Cuomo’s plan Saturday. It represents an about-face by Cuomo, who previously opposed medical marijuana. Administration officials told the newspaper that the medical marijuana policy will be more restrictive than in states like Colorado and California and subject to New York Health Department standards.

In states that permit medical marijuana, it is commonly prescribed for chronic pain, nausea from cancer chemotherapy, glaucoma and some other conditions. Other controlled substances like narcotics are already authorized for medical use in New York.

Although marijuana remains illegal in New York, possession of small amounts has been reduced to a low-level violation subject to a fine.

The Drug Policy Alliance, which was briefed on the Cuomo plan Saturday, said it would be a huge change but that New York should still enact legislation authorizing a state medical marijuana program that has been blocked so far by the state Senate’s Republicans.

“This is a good development as an interim step,” said Gabriel Sayegh, state director of the Drug Policy Alliance. After the briefing, he said the timing was still unclear as well as precisely who will have access to the program.

The Cuomo administration did not respond to requests from the Associated Press for comment.

Assemblyman Richard Gottfried, a Manhattan Democrat, and Democratic Sen. Diane Savino of Staten Island have recently held hearings on a bill they are sponsoring called the Compassionate Care Act, which would regulate and tax medical marijuana. It has previously passed in the Assembly but failed to get through the Senate.

State Sen. Liz Krueger, another Manhattan Democrat, has been pushing legislation to legalize and tax recreational use of marijuana, arguing that state policy outlawing the drug has been costly in terms of law enforcement resources and the futures of people convicted of crimes.