Metformin, a biguanide drug that is used to treat type 2 diabetes. It may cause loss of appetite and minor digestive upsets; it should not be used in patients with kidney disease, in whom it may cause lactic acidosis.
Reference: Oxford Concise Colour Medical Dictionary (7th Edition, Kindle Edition) Oxford University Press 2020 ISBN-13: 978-0198836629, p1871
