The BMJ Oct 17 2024 Potential fathers with type 2 diabetes can be reassured that taking the drug metformin is not associated with birth defects in their offspring, concludes a large study of more than 3 million pregnancies published by  The BMJ  today.  The researchers say the findings show that metformin can continue to be considered a suitable drug for managing blood sugar levels in men with type 2 diabetes who plan on having children. Metformin is widely used to treat type 2 diabetes in men