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The latest recall of type 2 diabetes drug metformin was made Friday by Viola Pharmaceuticals, which pulled two lots of 750 mg tablets.

This is Viola’s first metformin recall. But, the cause is the same as the many previous metformin recalls over the last 13 months: too much NDMA (N-nitrosodimethylamine), a probable carcinogen (cancer-causing ingredient) in the tablets.

Another rerun from previous recalls is the companion advice to keep taking the recalled metformin until you come up with a replacement treatment in consultation with a doctor or pharmacist. The amount of NDMA in the drug doesn’t make it instantly lethal, but slightly increases the chance of getting cancer.

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