The document discusses various drugs used to treat diabetes, including their mechanisms of action, side effects, and classifications. It notes that lactic acidosis is common with phenformin, rosiglitazone acts as a PPAR gamma agonist but not by increasing insulin secretion, hypokalemia can occur if insulin is given rapidly for diabetic ketoacidosis, and metformin can cause vitamin B12 deficiency. Common side effects of thiazolidinadiones include water retention and weight gain.