Toxicology tests have confirmed that seven UCD students, who were hospitalised, had taken LSD and amphetamines separately.
Gardai have dismissed earlier reports that they became ill after taking a lethal new concoction, known on the streets as "scuzz".
The seven were admitted to hospital and six of them were said to be in a serious condition.
All had been behaving very erratically and, according to gardai, posed a danger to themselves and to others.
Gardai warned, last night, that taking the two drugs on the same night could also result in a heart attack.
Those admitted to hospital were all either medical or veterinary students at UCD.
Source: Irish Independent, 16/05/2014