They may not be safe for use.
The agency warns that the vials may not have been stored properly and could be dangerous to consumers. The FDA has received multiple reports of patients who suffered unsafe blood sugar levels after using the products.
The FDA issued an alert in June that three lots of Novo Nordisk's Levemir insulin were stolen in North Carolina. Regulators say only about 2 percent of the 190,000 vials have been returned.
Regulators advised patients not to use Levemir insulin from lots: XZF0036, XZF0037, XZF0038.
The FDA says it continues to investigate the theft.
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