THE Northern Ireland Ambulance Service say up to 40 people have been treated for the effects of drink and drugs.
A total of 14 were taken to Ulster Hospital in Dundonald, the Mater Hospital in north Belfast and the Royal Victoria Hospital in west Belfast.
All are said to be in a stable condition.
The Belfast Trust said tonight that it does not expect to anymore patients from the concert at this stage.
However, police are monitoring the situation both inside and outside the venue.
A doctor was at the scene after scores of people presented themselves at the SOS Charity bus at the Odyssey.
John McPoland of the NIAS said: “A number of those who presented themselves to the SOS bus were suffering from the effects of drink and drugs.”
At least one gave the appearance of being unconscious.
A major incident was declared at the Ulster, Royal and Mater Hospitals with extra doctors and consultants drafted in to cope with the situation.
It is understood some of those had tried to get access to the Odyssey but were refused because they were “pre-loaded” with drink.