Eleven people have been hospitalised in Wellington in the past week and a half following suspected synthetic drug use.
Four people were urgently admitted to hospital in the space of 24 hours in Porirua, but Capital and Coast DHB has now revealed the number of affected patients so far this month is more than double that.
"In the past week and a half, 11 people have come to Wellington Regional Hospital's emergency department experiencing the effects of what doctors believe to be synthetic drugs," a statement from the DHB said.
"Of those people, at least five were admitted to hospital between 7 and 8 November."
Kapiti-Mana Police said emergency services were called four times between Tuesday and Wednesday afternoon.