Medsafe says it has had discussions today with the maker of the hormonal pregnancy test known as Primodos.
The product is at the centre of fears in Britain and elsewhere over whether it caused serious deformities in children.
Primodos was available in this country from 1966 until 1975.
Medsafe said the drug-maker, Bayer, has not been able to say how many doses were distributed here.
The Dunedin-based Centre for Adverse Reactions Monitoring has received no reports of foetal malformations associated with Primodos.
Anyone worried is urged to contact Healthline.