"It is never advisable to take medication that hasn't been obtained from or prescribed by a health professional, so we are asking for their immediate return."
The items have a combined value of around $15,000. As a charity that relies on community donations to keep the service free of charge, the theft is extra hard to take.
Tibbott says the theft came on the same day the service launched its annual Onesie Appeal, which asks the community to donate to the charity and keep its service free to use.
"It feels like a slap in the face that we now have to replace these stolen items at considerable cost."
Senior Sergeant Richard Potton from Wellington Police said they are investigating the serious incident.
"It is really disappointing that this has occurred to a vital lifesaving service that should be off limits to a criminal act," he said.
"We encourage anyone with information to please come forward so we can return the equipment."