Big picture summary at a glance
Product name: Glucophage. Active substance: metformin. Main indication: treatment of type 2 diabetes mellitus in adults as part of lifestyle measures and, when needed, in combination with other medicines.
Glucophage is commonly supplied as a prescription-only oral antidiabetic medicine across the United Kingdom. If you want to jump straight to administration advice use the link to How to take correctly metformin correctly, for safety concerns see Warning signals and urgent signs, or for supply options go to Ways to obtain Status of UK statutes and what it involves..
The way the device operates and what it demonstrates
Metformin belongs to the biguanide class. Its glucose-lowering effects come from several a mechanisms:
- Reduction of liver glucose production.
- Enhancing peripheral insulin sensitivity so muscles and fat take up more glucose.
- Modestly decreasing glucose absorption from the gastrointestinal tract.
Unlike secretagogues, metformin does not stimulate insulin release, which is why it generally has a low risk of causing low blood sugar when used alone. It is often the first drug prescribed for type 2 diabetes after lifestyle measures fail to control glucose.
Potency options and corresponding dosing information
In the UK metformin is produced by multiple manufacturers in immediate-release and modified-release forms. Common tablet strengths include 250 mg, 500 mg, 850 mg and 1000 mg.
- Immediate-release: often started at 500 mg twice daily or 850 mg once daily with meals and increased gradually with ongoing monitoring.
- Modified-release (MR/XR): typically taken once daily, usually with the main evening meal to reduce stomach upset.
Typical upper limits for healthy adults are up to about 2550 mg daily for some immediate-release regimens, but prescribers may set lower maxima for patients with renal impairment. Always follow the dosing schedule provided by your prescriber besides the pharmacy label. For switching strategies and timing see Guidelines for taking metformin.
Ways to take metformin
Use metformin only as prescribed for you. Do not share your tablets with anyone.
- Take immediate-release tablets with food to reduce gastrointestinal unwanted reactions.
- Swallow modified-release tablets whole; do not crush, chew or split unless the product information allows it.
- Stick to the regimen agreed with your clinician and attend blood tests to monitor kidney function and glucose control.
- If your treatment plan changes or you develop new symptoms, contact your prescriber or pharmacist before altering doses.
If you are considering changing from twice-daily dosing to a once-daily MR formulation, seek advice from your healthcare professional first. If a dose is forgotten, refer to the missed dose the part called section. Instructions for i missed a doses.
Warning alerts and urgent signs
A rare but serious complication associated with accumulation of metformin is lactic acidosis. Seek emergency medical attention if you experience any combination of the following:
- Marked weakness or extreme fatigue
- Difficulty breathing or unusually rapid breathing
- Very slow or irregular heartbeat, feeling cold or lightheaded
- Severe muscle pain, fainting or dizziness
- Persistent abdominal pain, nausea or vomiting
While metformin alone seldom causes hypoglycaemia, the risk increases when it is used with insulin or sulfonylureas. Keep fast-acting carbohydrate available and follow your hypoglycaemia action plan when on combinations that can lower blood sugar.
Limit alcohol intake because heavy or binge drinking raises the chance of lactic acidosis and can disturb glucose control. You may be instructed to stop metformin temporarily before and after procedures using iodinated contrast media or prior to major surgery; follow the advice of your healthcare team.
Contratraces to use in these settings and safety advisories
Do not start or continue metformin if any of the following apply unless a specialist has advised otherwise:
- Known hypersensitivity to metformin or any component of the product
- Severe or acute renal impairment
- Current diabetic ketoacidosis or hyperosmolar state
- Advanced liver disease
- Unstable or severe heart failure, recent myocardial infarction, or severe respiratory disease
- Severe infection, dehydration or shock
- Spirits dependence or heavy alcohol use
- Very low calorie diets (for example under 1000 kcal per day)
- Previous lactic acidosis attributed to metformin
- Pregnancy and breast feeding unless advised by your clinician
Older people and those performing heavy manual work should have an individualized assessment of risks and benefits before taking metformin. Discuss any concerns by consulting your prescriber.
Possible reactions and symptoms to look out for
The most commonly reported adverse impact on health affect the digestive system and are often transient:
- Nausea and sometimes vomiting
- Gastrointestinal diarrhoea, wind or bloating
- Anorexia or abdominal discomfort
- Minor weight changes in some people
Allergic reactions such as rash or facial swelling are rare but need urgent assessment. If you notice symptoms that could suggest lactic acidosis, see Cautionary notes and urgent signs and seek emergency help.
Drug-pharmacologic the exchange that happens when people meets at scale reveal systemic patterns. between drugs with other substances
Tell your healthcare team about all medicines, including over-the-counter drugs, supplements and herbal remedies. Examples of the quality of interacting as a shared activitys matters for trust. include:
- Cimetidine (Tagamet) may increase blood levels of metformin; observation and tracking may be required if both are used.
- Alcohol content can increase lactic acidosis risk and affect glucose control; avoid excess intake.
- Diuretics, particularly thiazides, can affect kidney function and glucose levels.
- Insulin and sulfonylureas increase the risk of hypoglycaemia when combined with metformin and may necessitate dose adjustments.
- Certain antibiotics, corticosteroids and sympathomimetic agents can alter glucose control and require keeping track of metrics.
If you are scheduled for imaging involving iodinated contrast, follow local guidance about pausing metformin; see Warning alerts and urgent signs additional details are available.
Treatment guidance for i missed the medication doses
- When you forget a dose by mistake, take it as soon as you remember unless it is almost time for the next dose.
- Do not take two doses at once in order to make up for a missed tablet.
- Return to where you left off your regular dosing schedule with the next planned dose.
If the dose was misseds are frequent, discuss reminder strategies with your pharmacist or consider whether a once-daily MR preparation might improve adherence. For serious dosing errors refer to Steps to take in fatal overdose management and emergencies.
Emergency actions in experiencing an overdose cases
An excessive intake of metformin can cause severe illness. Early signs include marked nausea, vomiting and abdominal pain. In larger fatal overdoses lactic acidosis may develop, leading to rapid breathing, extreme tiredness, dizziness or fainting. If an fatal overdose is suspected obtain immediate emergency medical care.
If you are on combination therapy and develop symptoms of hypoglycaemia such as sweating, tremor or confusion, measure your blood glucose and follow your hypoglycaemia action plan. Emergency services should be contacted for severe or persistent symptoms.
Digital the storage of files is essential for data management. safety guidelines
- Store metformin at normal room temperature, ideally between 20 and 25 C.
- Keep the medicine away from excessive heat, moisture and direct sunlight.
- Do not store medicines in bathrooms. Ensure medicines stay hidden from children and out of their reach.
UK price approximations for various other selections
Costs vary by supplier, pack size and whether the supply is private or on the NHS. The figures below are approximate private retail ranges in GBP and should be treated as a rough guide.
Typical metformin costs
- Generic metformin immediate-release 500 mg: approximately 1 to 6 GBP for common 28 to 56 tablet packs.
- Metformin modified-release (MR/XR) products: around 5 to 20 GBP per month depending on dose and pack size.
Other glucose-lowering medicine options (indicative private monthly costs)
- Sulfonylureas (for example gliclazide, glimepiride): low cost generics, roughly 2 to 6 GBP per month; higher hypoglycaemia risk.
- DPP-4 inhibitors (sitagliptin, linagliptin): typically 20 to 40 GBP per month.
- SGLT2 inhibitors (empagliflozin, dapagliflozin): commonly 20 to 50 GBP per month; may offer cardiorenal benefits for selected patients.
- Pioglitazone (thiazolidinedione): generally inexpensive but not suitable in heart failure.
- GLP-1 receptor agonists (semaglutide, dulaglutide): often considerably more expensive, frequently from 70 GBP per month and typically injectable.
- Insulin: price and regimen vary greatly by type and dosage; requires ongoing supervision and monitoring and tailored prescribing.
Choice of therapy depends on kidney function, cardiovascular risk, weight goals, side effect profiles and patient preferences. Discuss the options and likely costs with your prescriber or pharmacy team. Practical administration advice is at Ways to take the metformin medication and safety risks to assess at Warnings and urgent signs.
A guide to Juridical status under UK law and how to secure it.
Classification: metformin (Glucophage) is a prescription-only medicine (POM) in the UK.
- It is supplied on an NHS prescription or via a private prescription issued by a prescriber registered in the United Kingdom.
- Dispensing must be performed by pharmacies registered with the General Pharmaceutical Council (GPhC).
- Online pharmacies based in the UK must be registered with the GPhC and will require a valid UK prescription; reputable services carry out a clinical review before dispensing.
- Importing prescription medicines into the UK is restricted; using UK-registered suppliers and prescribers is the safest and most lawful approach.
- NHS prescription charges apply in England (fixed fee per item for many adults); prescriptions are free in Scotland, Wales and Northern Ireland. Concessions and prepayment certificates may reduce costs.
- Driving: metformin alone has a low risk of causing hypoglycaemia. If you use additional medicines that can cause low blood sugar, follow advice from the DVLA and your clinician about driving and monitoring.
Keep records of your prescription conjoined with the pharmacy label. If you have questions about legal supply or safe sourcing, consult a registered UK pharmacist or your prescriber. For dosing details, see the accompanying documentation. Merits and dosing guidelines information.
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