Diabetes drug metformin may not provide cardiovascular benefits to heart disease patients who don't have diabetes, according to a study published in The Lancet Diabetes & Endocrinology. Researchers didn't find any improvement on carotid intima-media thickness, a sign of atherosclerosis, among metformin users. The drug, however, helped patients lose weight after 18 months of treatment. "Further evidence is needed before metformin can be recommended for cardiovascular benefit in this population," researchers said.

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