State health department officials said that many of the youth were brought unconscious with symptoms of drug overdose to the Civil Hospital here where many of them died.
"Some of them were revived by administering antidotes while some died as they received treatment too late," the officials said.
Jeremy Pachuau, Medical Officer of the Aizawl Civil Hospital's Emergency department said that most of the cases were due to consumption of cough syrup spiked with grape wine which could produce dangerous chemical reactions.
Further investigations were necessary, he added.