A client taking metformin reports experiencing nausea, diarrhea, and abdominal discomfort. What is the best nursing intervention to minimize these side effects?

Metformin's most common gastrointestinal side effects — nausea, diarrhea, and abdominal discomfort — are largely related to the drug's local irritating effect on the gastrointestinal mucosa. Taking metformin with food slows absorption and reduces direct mucosal irritation, which is the most evidence-based and clinically recommended strategy for managing these symptoms. Prescribers routinely advise patients to take metformin with meals specifically for this reason, and adherence improves significantly when patients follow this instruction. Taking an over-the-counter antacid before each dose is not recommended because antacids do not address the mechanism of metformin's GI side effects and can interfere with the absorption of other medications. Splitting the dose may sometimes be suggested, but this is a prescriber decision rather than an independent nursing intervention, and it does not address the root cause as directly as meal-time dosing. Increasing fiber intake gradually addresses general gastrointestinal health but is not the primary intervention for metformin-induced GI symptoms; in fact, adding fiber does not prevent the drug's mucosal irritation. Therefore, instructing the client to take metformin with meals is the best and most appropriate nursing intervention to minimize these side effects.