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Glucophage

Glucophage: What Is It?

Glucophage is a brand name for the oral medication metformin, an established treatment for type 2 diabetes. The drug is supplied in pill form and is available in strengths of 500 mg, 850 mg, and 1000 mg. In Hong Kong, metformin-containing products are prescription-only medicines regulated by the Hong Kong Department of Health. Glucophage belongs to the therapeutic class of big-biguanide antidiabetic agents that help control blood glucose levels.

How Metformin Works in the Body

Metformin lowers blood glucose primarily by reducing the amount of sugar produced by the liver. It inhibits hepatic gluconeogenesis, a process that normally generates glucose during fasting. At the same time, metformin modestly improves the body’s sensitivity to insulin, allowing muscle and fat cells to take up glucose more efficiently. The drug does not stimulate insulin secretion, which is why it carries a low risk of causing low blood sugar (hypoglycaemia) when used alone.

Key pharmacologic points:

• Onset of action: Blood glucose-lowering effects are generally observed within a few days of starting therapy.
• Peak effect: Peak plasma concentrations occur 2-3 hours after an oral dose.
• Duration: The glucose-lowering effect persists for about 12 hours, which is why most regimens use twice-daily or once-daily dosing.
• Bioavailability: Approximately 50-60 % of an oral dose reaches systemic circulation; food can reduce absorption slightly, so the drug is usually taken with meals.
• Metabolism & excretion: Metformin is not metabolised by the liver. It is excreted unchanged by the kidneys, making renal function a critical factor in dosing decisions.

Conditions Treated with Glucophage

Glucophage is approved in Hong Kong and many other jurisdictions for the management of type 2 diabetes mellitus in adults. It may be used as monotherapy in patients whose blood glucose is not adequately controlled by diet and exercise alone, or as part of combination therapy with other oral antidiabetic agents or insulin when additional glucose-lowering is needed.

Typical patient profiles include:

• Adults diagnosed with type 2 diabetes who have preserved kidney function (eGFR ≥ 45 mL/min/1.73 m²).
• Individuals seeking a medication with a low intrinsic risk of hypoglycaemia.
• Patients who need an inexpensive, well-studied option for long-term glucose control.

Evidence-Based Off-Label Uses

Research has explored metformin for several conditions beyond type 2 diabetes. The most substantiated off-label indications are:

• Polycystic ovary syndrome (PCOS): Metformin improves insulin resistance and may help restore normal menstrual cycles and ovulation. Clinical guidelines note that use should be under specialist supervision.
• Prediabetes / impaired glucose tolerance: Some guidelines endorse metformin to delay progression to overt diabetes in high-risk individuals, especially those with a BMI ≥ 35 kg/m² or a strong family history.

These applications are not approved by Hong Kong regulatory authorities for Glucophage. Off-label use requires careful medical supervision and individualized risk assessment.

Who Should and Should Not Use Glucophage?

Ideal Candidates

• Adults with confirmed type 2 diabetes.
• Patients with a body mass index (BMI) that benefits from the modest weight-neutral or weight-loss effect of metformin.
• Individuals whose renal function is stable and meets minimum clearance criteria.

Absolute Contra-Indications

• Known hypersensitivity to metformin or any of the tablet’s inactive ingredients.
• Severe renal impairment (eGFR < 30 mL/min/1.73 m²).
• Acute or chronic metabolic acidosis, including diabetic ketoacidosis, with or without lactate accumulation.
• Concurrent use of iodinated contrast agents in patients at risk of renal dysfunction (the drug should be withheld before and after the contrast study as per guidance).

Relative Contra-Indications

• Moderate renal impairment (eGFR 30-45 mL/min/1.73 m²) - dose reduction and close monitoring are required.
• Hepatic disease that may predispose to lactic acidosis.
• Heart failure (NYHA Class III/IV) - assess renal perfusion before initiating therapy.
• Pregnancy (use only when benefits outweigh risks) and lactation (caution advised).

Special Populations

• Elderly: Start at the lowest dose and titrate slowly due to higher risk of renal function decline.
• Pregnant women: Metformin may be continued if already prescribed before conception; otherwise, insulin remains the preferred agent for tight glycaemic control.
• Patients undergoing surgery or radiological procedures with contrast: Hold metformin at least 48 hours before and after the procedure if renal function is uncertain.

Safety Profile: Side Effects and Interactions

Common Side Effects

• Gastrointestinal upset (nausea, abdominal discomfort, diarrhea) - occurs in up to 20 % of patients, usually transient.
• Metallic taste - reported occasionally, resolves with continued use.
• Reduced vitamin B12 absorption - long-term therapy may lead to mild deficiency; periodic monitoring is advised.

Serious Adverse Events

• Lactic acidosis: A rare but life-threatening condition characterised by rapid breathing, muscle pain, and abdominal discomfort. The incidence is < 0.1 % but rises sharply in the presence of renal failure or severe hypoxia.
• Hypersensitivity reactions: Rash, urticaria, or angioedema may occur; discontinue immediately if severe.

Drug Interactions

• Cimetidine, trimethoprim, and certain antivirals can increase metformin plasma levels by reducing renal clearance.
• Contrast media (iodinated agents) may precipitate acute renal injury; metformin should be suspended before the exam and resumed only after renal function is confirmed stable.
• Alcohol can potentiate the risk of lactic acidosis; patients should limit intake.

Food and Lifestyle Interactions

• Take Glucophage with meals to minimise gastrointestinal side effects and improve absorption.
• Alcohol consumption should be moderate; heavy drinking raises the risk of lactic acidosis.
• No known impairment of driving or machinery operation.

If patients are unsure about potential interactions, they should disclose all prescribed medicines, over-the-counter products, herbal supplements, and dietary habits to their healthcare provider.

How to Take Glucophage

Standard Dosing

• Initial dose: 500 mg taken once daily with the evening meal.
• Titration: Increase by 500 mg weekly or every 2 weeks, based on tolerance, to a typical maintenance dose of 1500 mg-2000 mg per day divided into two doses.
• Maximum dose: 2550 mg per day (usually administered as 850 mg + 850 mg + 850 mg). The three available strengths (500 mg, 850 mg, 1000 mg) allow flexible dosing.

Special Population Adjustments

• Renal impairment: For eGFR 30-45 mL/min/1.73 m², limit total daily dose to ≥ 1000 mg and monitor renal function every 3-6 months.
• Elderly: Start at 500 mg once daily; consider once-daily extended-release formulations where available.
• Hepatic disease: Use the lowest effective dose; monitor lactate levels if clinically indicated.

Administration Tips

• Swallow the tablet whole; do not crush or chew.
• Store tablets at room temperature, away from moisture and direct sunlight.
• Keep out of reach of children; original blister packs provide child-resistant closures.

Missed Dose

If a dose is missed, take it with the next meal. Do not double the dose to compensate for a missed one.

Overdose

Signs of metformin overdose include severe nausea, vomiting, abdominal pain, and rapid breathing. Immediate medical attention is required. Treatment focuses on supportive care, correction of acid-base imbalance, and, in severe cases, hemodialysis.

Discontinuation

Metformin does not generally require tapering. However, abrupt cessation in patients with poorly controlled diabetes may lead to hyperglycaemia; a transition plan to an alternative glucose-lowering therapy should be arranged by a clinician.

Monitoring and Follow-Up

• HbA1c: Check every 3 months after initiating therapy or adjusting the dose, aiming for a target individualized by the treating physician (often < 7 %).
• Renal function: Measure serum creatinine and calculate eGFR at baseline, then at least annually; more frequently if there is existing renal compromise.
• Vitamin B12: Assess every 2-3 years, especially in patients on metformin for several years.
• Lactate levels: Not routinely measured, but should be checked if clinical suspicion of lactic acidosis arises.

Regular follow-up visits enable dose optimisation, early detection of adverse effects, and reinforcement of lifestyle measures.

Storage and Handling

• Keep Glucophage tablets in their original container, tightly closed.
• Store at 15 °C-30 °C (room temperature).
• Protect from excess moisture and heat.
• Do not use tablets past the printed expiration date.
• Dispose of unused medication according to local pharmacy-take-back programs or Hong Kong Environmental Protection Department guidelines.

Medication-Specific Glossary

Biguanide

A class of antidiabetic agents that includes metformin; they primarily inhibit hepatic glucose production.

Lactic Acidosis

A rare metabolic complication characterised by elevated blood lactate levels and a pH < 7.35; it can be life-threatening.

eGFR (Estimated Glomerular Filtration Rate)

A calculated measure of kidney function used to adjust metformin dosing and assess safety.

HbA1c (Glycated Hemoglobin)

A blood test reflecting average glucose levels over the previous 2-3 months; used to gauge long-term diabetes control.

Medical Disclaimer

This article provides educational information about Glucophage and is not a substitute for professional medical advice. Treatment decisions, including use for unapproved indications, must be made under the guidance of a qualified healthcare provider. The content is intended for informational purposes and does not constitute medical recommendations. Always consult a physician before starting, stopping, or changing any medication regimen.