Mylan says it knows of two instances "world-wide" where the EpiPens from the recalled lot failed to activate.
It adds: "Anyone who possesses an Epipen for their own use or for someone in their care is urged to check for lot number 5FA665G and to ensure affected pens are immediately replaced".
Failure of the auto-injector to activate could mean people did not get the required dose of adrenaline resulting in the worsening of symptoms of anaphylaxis or anaphylactic reactions which could be life threatening.
Mylan New Zealand says that after consultation with Medsafe and the Ministry of Health, it is calling back two specific batches of the EpiPen 300 microgram Adrenaline Auto-Injectors.
Mylan, the makers of the EpiPen, announced on Monday that more than 80,000 units of the EpiPen, the patented device used to dispense a life-saving dose of adrenaline (a.k.a. epinephrine) in cases of severe allergies, have been recalled in multiple countries.
The affected batch numbers are: 5FA665, 5FA6651, 5FA6652, 5FA6653.
Did you have one of the affected EpiPens?
Pharmacists will replace the EpiPen free of charge. We also have a number of readers outside of the USA, so we're posting this news as a service to any of them who may have some EpiPens waiting to (hopefully never) be used. They added that users should be mindful that they may need to apply more force than normal to activate it.
The alert stated other batches and other makes of the life saving product are not known to be defective and are not subject to this recall.
Alphapharm has been contacted for comment.