Glucophage Sr
In brief
- In our pharmacy you can buy Glucophage SR without a prescription, with delivery in 9–21 days throughout the United Kingdom and discreet packaging. Glucophage SR is a prescription-only medicine (POM) in the UK.
- Glucophage SR (metformin hydrochloride) is used to treat type 2 diabetes; it is a biguanide that lowers blood glucose by reducing hepatic gluconeogenesis, improving peripheral insulin sensitivity and decreasing intestinal glucose absorption.
- The usual dose starts at 500 mg once daily with the evening meal, titrating by 500 mg weekly as tolerated; typical maintenance is 1,500–2,000 mg/day with a maximum per the product label.
- Form of administration: oral extended‑release tablets (commonly 500 mg, 750 mg or 1,000 mg) taken once daily with food.
- Onset time: blood‑glucose lowering begins within about 48–72 hours, though symptomatic and full glycaemic effects (HbA1c reduction) are usually seen over weeks to months.
- Duration of action: the sustained‑release formulation is designed for once‑daily dosing and provides approximately 24 hours of glycaemic control.
- Alcohol warning: avoid excessive alcohol intake and binge drinking as alcohol increases the risk of lactic acidosis when taking metformin; use caution with alcohol if you have liver disease or other risk factors.
- The most common side effect is gastrointestinal upset — nausea, diarrhoea, abdominal pain and flatulence — which is usually transient and improves with slow dose titration; long‑term use can rarely cause vitamin B12 deficiency and very rarely lactic acidosis.
- Would you like to try Glucophage SR without a prescription?
Legal status and availability in the UK
Glucophage SR (modified-release metformin) is a prescription-only medicine (POM) in the UK.
In our online pharmacy, Glucophage SR is available without a prescription, with discreet delivery to the United Kingdom in 5‑14 days.
Basic Glucophage SR information
- INN (international nonproprietary name): Metformin hydrochloride (Metforminum hydrochloridum).
- Brand names available in the United Kingdom: Glucophage SR; generic modified-release metformin tablets
- ATC code: A10BA02
- Forms and dosages: Modified-release tablets 500 mg, 750 mg and 1000 mg; oral, once daily
- Manufacturers in the United Kingdom: Merck (Glucophage SR); generic suppliers
- Registration status in the United Kingdom: Prescription-only medicine (POM)
- OTC / Rx classification: Prescription-only medicine (POM)
Product snapshot: what is Glucophage SR?
Active ingredient and classification
What exactly is inside a Glucophage SR tablet?
Glucophage SR contains the International Nonproprietary Name (INN) metformin hydrochloride (Metforminum hydrochloridum) as its active ingredient.
It belongs to the biguanide class and carries the ATC code A10BA02 for metformin.
Formulation and strengths available
How is the sustained‑release formulation presented to the patient at a glance?
| Specification | Details |
|---|---|
| INN | Metformin hydrochloride (Metforminum hydrochloridum). |
| Strengths | 500 mg, 750 mg, 1000 mg extended‑release tablets. |
| Dosing frequency | Once daily. |
| Prescription status | Prescription-only medicine (POM). |
| Indications | Glycaemic control in type 2 diabetes in adults. |
| Availability | Available as Glucophage SR and as generic modified-release metformin. |
Indications and when clinicians prescribe Glucophage SR
Primary indication: type 2 diabetes (adult)
When would a GP or specialist choose Glucophage SR for a patient?
Glucophage SR is primarily indicated for glycaemic control in adults with type 2 diabetes, usually as first‑line therapy alongside lifestyle measures.
Clinicians often start metformin and consider the SR form when once‑daily dosing is preferred to boost adherence or when GI sensitivity to immediate‑release metformin is an issue.
Initiation is commonly managed in primary care, with titration to effective dose during follow‑up appointments.
Off‑label and combination use
Can Glucophage SR be combined with other glucose‑lowering agents?
Off‑label or adjunct uses include combination therapy with SGLT2 inhibitors or DPP‑4 inhibitors as part of early combination strategies recommended by international guidelines.
Metformin SR is often continued with other agents to maintain glycaemic control and for its favourable weight and cardiovascular profile.
| Combination agent | Rationale |
|---|---|
| SGLT2 Inhibitors (e.g., dapagliflozin) | Additional glycaemic control and cardiovascular/renal benefits in selected patients. |
| DPP‑4 Inhibitors (e.g., sitagliptin) | Well tolerated add‑on with low hypoglycaemia risk. |
| Sulfonylureas / Insulin | Used when oral agents alone are insufficient; monitor for hypoglycaemia when combined. |
Choose SR over IR when adherence or GI tolerability is a concern and when once‑daily dosing simplifies the regimen.
Dosage, titration and how to take Glucophage SR
Starting dose and titration schedule
How should a patient start Glucophage SR to limit side effects?
Begin with 500 mg once daily with the evening meal and increase by 500 mg each week as tolerated until targets are met.
The usual maximum total daily dose is around 2000 mg.
Missed dose, switching from IR, and special population notes
What should a patient do if they miss a dose or switch from immediate‑release therapy?
If a dose is missed, take it as soon as remembered unless it is near the time for the next dose, and do not double up.
When switching from IR to SR, check total daily dose equivalence, advise slow titration and watch for GI symptoms for 2–4 weeks.
Renal function should be checked before initiation and during titration, especially in older patients.
| Parameter | Recommendation |
|---|---|
| Starting dose | 500 mg once daily with evening meal. |
| Titration increment | Increase by 500 mg each week as tolerated. |
| Target dose | Individualised to glycaemic response; common total ≈ 2000 mg/day. |
| Maximum | Commonly 2000 mg/day. |
Contraindications, cautions and special populations
Absolute contraindications
Who must not take Glucophage SR?
Absolute contraindications include severe renal impairment with eGFR less than 30 mL/min/1.73 m² and known hypersensitivity to metformin or excipients.
Acute or chronic metabolic acidosis, including diabetic ketoacidosis, and conditions associated with tissue hypoxia are also contraindications.
Cautions: renal, hepatic, elderly, pregnancy/lactation
Which patients need closer review before prescribing?
Do not initiate metformin SR if eGFR is between 30 and 45 mL/min/1.73 m² without careful review, and reassess frequently if renal function declines.
Hepatic impairment increases the risk of lactic acidosis and should generally preclude use.
Children under 18 are not generally indicated for SR formulations due to limited data, and older adults require cautious titration and renal monitoring.
- eGFR <30
- Absolute contraindication.
- eGFR 30–45
- Do not initiate without specialist review; monitor closely if already on therapy.
- Age >80
- Only use if renal function is normal and under close monitoring.
Side effects, monitoring and long‑term safety
Common transient effects and how to mitigate
What side effects are patients most likely to notice at the start?
Gastrointestinal effects such as nausea, diarrhoea, abdominal pain and flatulence are the most common and usually improve with slow titration.
Using the evening meal and switching to SR can reduce peak GI symptoms compared with immediate‑release metformin.
Serious but rare risks and monitoring schedule
What rare risks require vigilance and ongoing monitoring?
Very rare but serious is lactic acidosis, which presents with unexplained tiredness, myalgia, abdominal pain and rapid breathing and requires immediate medical attention.
Long‑term use can be associated with vitamin B12 deficiency, so check B12 in symptomatic patients or after prolonged therapy.
| Common side effect | Action |
|---|---|
| Nausea / Diarrhoea | Slow titration, take with food, consider changing to SR if on IR. |
| Flatulence | Dietary advice and time; often improves with continued use. |
| B12 deficiency | Check B12 if symptomatic and consider supplementation if low. |
| Lactic acidosis | Stop drug and seek emergency help if symptoms of malaise, myalgia or rapid breathing occur. |
- Monitoring checklist: baseline renal function and periodic eGFR checks, B12 where indicated, review of GI tolerability and symptoms at follow‑up.
Drug interactions and clinical precautions
Common interacting medicines (e.g. iodinated contrast, cimetidine)
Which medicines require extra care when patients take Glucophage SR?
Iodinated contrast media increase the risk of renal injury and lactic acidosis, and local protocols typically advise withholding metformin at the time of contrast and reassessing renal function before restarting.
Cationic drugs such as cimetidine can reduce metformin elimination and may require monitoring or dose adjustment.
Combining metformin with insulin or sulfonylureas can increase hypoglycaemia risk, so counsel patients on recognising low blood glucose symptoms.
Lifestyle interactions (alcohol, dehydration)
What lifestyle factors raise safety concerns?
Excessive alcohol increases the risk of lactic acidosis and should be avoided or minimised while on metformin.
Periods of dehydration, acute illness or vomiting can reduce renal perfusion and mandate temporary discontinuation until recovery.
| Interacting agent | Clinical effect | Action |
|---|---|---|
| Iodinated contrast | Risk of renal impairment and lactic acidosis. | Advise withholding per local protocol and check eGFR before restarting. |
| Cimetidine | May reduce metformin clearance. | Review concurrent therapy and monitor renal function. |
| Alcohol | Increases lactic acidosis risk. | Advise moderation and provide written guidance. |
SR vs XR vs IR
Pharmacokinetic differences and clinical relevance
How do sustained‑release and immediate‑release metformin differ in everyday terms?
SR and XR describe extended‑release technologies that spread metformin absorption to reduce peak plasma levels and lower gastrointestinal adverse events.
IR formulations usually require multiple daily doses and can be associated with greater GI upset in some patients.
Brands and generics
Which brands and generics might a patient see?
Generic prolonged-release metformin is available from several manufacturers, with similar extended-release technology.
| Formulation | Tolerability | Dosing frequency |
|---|---|---|
| SR/XR | Generally fewer peak GI events. | Once daily. |
| IR | Potentially more GI symptoms for some patients. | Multiple daily doses. |
Always verify a true ER formulation when switching to avoid accidental duplication of dose or altered pharmacokinetics.
Packaging and authenticity
How to verify packaging and batch/expiry data
What should be checked when receiving a pack of Glucophage SR?
Verify the batch number, expiry date, leaflet and tamper seals.
Packaging appearance can vary by manufacturer, so look for consistent labelling and intact blister packs.
Storage, transport and disposal instructions
Storage at home and during travel
How should patients store Glucophage SR at home and while travelling?
Store tablets at room temperature between 15–30°C in the original packaging, protected from moisture and heat.
Carry medication in its labelled blister pack with a copy of the prescription or GP letter when travelling.
Safe disposal and pharmacy returns
What is the correct way to dispose of leftover or expired tablets?
Return unused or expired medicines to a community pharmacy take‑back scheme and do not flush tablets down the toilet.
- Travel pack checklist: medicine in original blister, copy of prescription, small hard storage case and contact details for pharmacy.
Managing special clinical scenarios (renal impairment, perioperative, contrast imaging)
Renal impairment management and dosing thresholds
How should pharmacists advise patients with reduced renal function?
Metformin SR is contraindicated if eGFR is under 30 mL/min/1.73 m² and should not be initiated if eGFR is 30–45 without careful review.
Monitor eGFR more frequently in patients with declining renal function and consider dose reduction or stopping if thresholds are crossed.
Perioperative/sick day rules and contrast media guidance
What steps are required around surgery, acute illness or contrast imaging?
Advise patients to temporarily stop metformin during significant illness, dehydration or before major surgery until clinically stable and renal function reassessed.
For iodinated contrast procedures, follow local radiology and MHRA guidance to withhold metformin at the time of contrast and check renal function before recommencing.
Combination therapy and switching strategies
Typical add‑on agents and rationale
Which agents are commonly added when metformin alone is insufficient?
Common add‑ons include SGLT2 inhibitors and DPP‑4 inhibitors, chosen for glycaemic efficacy and patient comorbidities.
Metformin is often continued for its weight‑neutral and potential cardiometabolic benefits where tolerated.
Switching from IR to SR and interchange considerations
How should a patient be counselled when switching formulations?
Ensure total daily dose equivalence, counsel on gradual titration to reduce GI effects, and verify formulation strength to avoid accidental duplication.
| Scenario | Practical advice |
|---|---|
| Switch IR → SR | Match total daily dose, start with SR 500 mg once daily if initiating and titrate as needed. |
| Add SGLT2 | Monitor renal function and advise on genital infection risk and blood glucose monitoring. |
Delivery across the United Kingdom
| City | Region | Delivery Time |
|---|---|---|
| London | Greater London | 5‑7 days |
| Manchester | North West | 5‑7 days |
| Birmingham | West Midlands | 5‑7 days |
| Glasgow | Scotland | 5‑7 days |
| Edinburgh | Scotland | 5‑7 days |
| Cardiff | Wales | 5‑7 days |
| Belfast | Northern Ireland | 5‑7 days |
| Leeds | Yorkshire and The Humber | 5‑9 days |
| Bristol | South West | 5‑9 days |
| Newcastle | North East | 5‑9 days |
| Liverpool | North West | 5‑9 days |
| Sheffield | South Yorkshire | 5‑9 days |
| Aberdeen | Scotland | 5‑9 days |
Frequently asked questions
Can I take Glucophage SR with food?
Yes, take with the evening meal to reduce gastrointestinal side effects.
Do I need regular blood tests on Glucophage SR?
Baseline and periodic renal checks are required, with B12 checked if symptomatic or after long‑term use.
Is Glucophage SR safer than IR for stomach upset?
SR aims to reduce peak GI effects and can be better tolerated for some patients.
How soon will blood glucose improve after starting?
Glycaemic response varies; clinicians titrate dose weekly from 500 mg once daily and assess response in follow‑up.
Reporting issues and further support
What should patients do if they suspect a problem with their medicine?
Report suspected adverse reactions via the Yellow Card scheme and contact the dispensing pharmacist or prescriber for urgent advice.
