Glucophage (Metformin Hydrochloride)

Glucophage (metformin hydrochloride) is prescribed to lower elevated blood glucose in adults with type 2 diabetes mellitus, particularly when lifestyle measures alone do not achieve glycemic goals. It is commonly incorporated into a broader treatment plan that includes diet, physical activity, and regular monitoring.

• First‑line oral therapy for newly diagnosed type 2 diabetes.
• Added to existing antidiabetic regimens when monotherapy is insufficient.
• Combined with insulin in patients requiring additional glucose control.
• Used in some cases of impaired glucose tolerance to delay onset of diabetes.
• Occasionally employed off‑label for polycystic ovary syndrome under specialist guidance.

Metformin may cause a range of adverse effects, most of which are mild and transient, while rare serious reactions require medical attention.

Common

• Nausea or upset stomach, especially when therapy is initiated.
• Diarrhea or loose stools that often improve with dose adjustment.
• Abdominal discomfort or cramping.
• A metallic or “off‑taste” sensation in the mouth.
• Weight loss or decreased appetite.

Serious

• Lactic acidosis, a rare but life‑threatening metabolic complication.
• Severe hypoglycemia when combined with insulin or secretagogues.
• Marked vitamin B12 deficiency leading to anemia or neuropathy.
• Skin rash or hypersensitivity reactions.
• Persistent elevated lactate levels requiring immediate medical evaluation.

Before starting Glucophage, clinicians assess several patient‑specific factors to minimize risks and ensure safe use.

• Assess renal function; metformin is contraindicated in severe renal impairment.
• Evaluate liver disease, as hepatic dysfunction may increase lactic acidosis risk.
• Review any history of alcohol abuse or conditions that predispose to hypoxia.
• Consider age; older adults may require lower initial doses.
• Monitor vitamin B12 levels during long‑term therapy.
• Discontinue before any radiologic studies that use iodinated contrast agents.

Metformin can interact with several medications, altering its effectiveness or increasing the likelihood of adverse events.

Avoid

• Iodinated contrast agents used in imaging studies (risk of acute kidney injury).
• Cimetidine, which can raise metformin plasma concentrations.
• Certain antivirals such as dolutegravir that may affect renal clearance.

Use with caution

• Insulin or sulfonylureas, which increase hypoglycemia risk.
• Diuretics that may impair renal function.
• ACE inhibitors or ARBs in patients with fluctuating kidney function.
• Alcohol excess, which can precipitate lactic acidosis.
• Other drugs that may affect renal clearance, such as NSAIDs.