Doctors will be able to prescribe cannabis products to patients from 1 November, the Home Secretary Sajid Javid says.
The new regulations apply to England, Wales, Scotland and Northern Ireland.
Mr Javid decided to relax the rules on when cannabis products could be given to patients after a review into medicinal cannabis earlier this year.
This followed an outcry over Alfie Dingley and Billy Caldwell being denied access to cannabis oil.
The parents of the two young epilepsy sufferers said the product helped to control their seizures.
Alfie’s mother, Hannah Deacon, welcomed the move, saying: “We urge the medical world to get behind these reforms so they can help the tens of thousands of people who are in urgent need of help.
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