A warning was issued by police after a man was taken to hospital after taking illegal drugs.
Officers believe the incident in Jesmond - which left a man needing emergency treatment - was linked to illegal substances, including ecstasy.
Now a leading officer with Northumbria Police has issued a stern warning and urged people not to take the drugs.
Chief Insp George Maratty said: “Taking any illegal drug is dangerous and potentially life threatening. Information suggests those in the house had taken ecstasy, which is an illegal class A drug, and we would urge people not to take it.
“Anyone who has taken it and feels unwell is urged to seek medical treatment immediately.”
Officers were called at 12.50pm on Monday following concerns for a man at an address at Osborne Road in Jesmond, Newcastle.
He has been taken to the RVI for treatment where he is in a serious condition. A number of other people at the address were checked over by paramedics as a precaution.
In a statement released last night a Northumbria Police spokesman said “information passed to the police suggests those involved had taken illegal drugs”.
He added: “It’s thought one of those is ecstasy, however, this has not been confirmed.”
Enquiries are being carried out to establish exactly what has happened, with officers speaking with those involved.
Chief Insp Maratty added: “We were called to the address on Monday where a man was taken to hospital in a serious condition.
“We are carrying out extensive enquiries and are working with our partners to find out what has happened and warn others of the dangers.”
The investigation is ongoing and anyone with any information which could help police is asked to contact officers on 101.
Anyone who needs emergency medical attention should call 999.