If so, I could not find any link between the drug and infertility. Diabetes makes a person more prone to be infertile. According to one drug website I visited:
FDA pregnancy category C. This medication may be harmful to an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant during treatment.
It is not known whether insulin glargine passes into breast milk or if it could harm a nursing baby. Do not use this medication without telling your doctor if you are breast-feeding a baby.