A man who's advocated for bringing back pseudoephedrine wants official recognition it was a bad idea.

John Key's Government removed the cold and flu medication, hoping to stall meth manufacture.

Associate Health Minister David Seymour is introducing a bill this  to reclassify the drug, so it's available in pharmacies without a prescription.

Blackland PR director, Mark Blackham says a moral panic about meth forced the rushed ban, despite evidence showing it wouldn't work.

"I think the only way of stopping bad decisions in the future is to get Governments to apologise for the role they had."

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• Act Party promises to bring back over-the-counter pseudoephedrine