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Metformin in Australia: Why This 60-Year-Old Tablet Is Still the Smart First Step for Type 2 Diabetes

By an Australian GP | General information article for people over 30

If you have just been told your blood sugar is too high — or you have been living with type 2 diabetes for years — you may feel worried, overwhelmed, or even afraid of what comes next. Many patients tell me they fear needles, hate the idea of gaining more weight, worry about the cost of medicines, and dread the long-term damage diabetes can do to their eyes, kidneys, feet, and heart.

Here is the good news: metformin — one of the oldest, most studied, and most affordable diabetes medicines in Australia — directly addresses many of those fears. In this review, I will walk you through the key facts, answer the common questions I hear in my Australian GP clinic, and explain why metformin is still the foundation of type 2 diabetes care for adults and many adolescents.

Attention: What Is Metformin and Why Should You Care?

Metformin belongs to a class of medicines called biguanides. It has been used for more than 60 years and is recommended by Australian and international diabetes guidelines as the first-line oral medicine for most people with type 2 diabetes. It does not cure diabetes, but it helps control blood glucose in a way that is safe, effective, and generally well tolerated.

For many people over 30, a type 2 diabetes diagnosis feels like a life sentence. You may picture insulin injections, weight gain, hypos, and expensive medications. Metformin changes that picture. It is an oral tablet, not an injection. It does not usually cause weight gain — in fact, it is often weight neutral or helps modest weight loss. And when used alone, it very rarely causes hypoglycaemia.

Interest: How Metformin Actually Works

To understand metformin, it helps to understand type 2 diabetes. In type 2 diabetes, your body becomes less responsive to insulin, and your liver may produce too much glucose, especially overnight. That pushes blood sugar levels up and drives many of the complications you want to avoid.

Metformin works in three main ways:

• Lowers liver glucose production: The liver is a major source of glucose in the body. Metformin reduces the amount of glucose the liver releases into the bloodstream.
• Improves insulin sensitivity: Your muscles and tissues become better at using glucose for energy, so less sugar stays in the blood.
• May improve gut-related glucose control: Metformin also increases some gut hormones that help regulate appetite and blood sugar.

The result is a meaningful drop in HbA1c — usually around 1% to 1.5%, depending on the starting level and whether it is combined with other medicines. That may sound small, but in diabetes terms it is powerful: every 1% reduction in HbA1c is associated with a substantially lower risk of microvascular complications like eye, kidney, and nerve damage.

Desire: Real-World Answers to the Questions I Hear Every Day

1. Can metformin tablets be stored in the bathroom?

No. I know the bathroom cabinet seems convenient, but it is one of the worst places to store most medicines. Bathrooms are humid and often warm, especially after showers and baths. Moisture and heat can break down metformin tablets, reduce their effectiveness, and cause the coating to soften or crumble.

2. Metformin and dapagliflozin combination — is it useful?

Yes. In Australia, dapagliflozin is an SGLT2 inhibitor sold under the brand name Forxiga, among others. It is often added to metformin when blood glucose is not well controlled on metformin alone. In fact, many Australian GPs and endocrinologists now prescribe this combination because the two medicines work in different but complementary ways.

While metformin mainly reduces liver glucose output and improves insulin sensitivity, dapagliflozin helps the kidneys remove excess glucose through urine. This can add extra blood sugar lowering, and many patients also see modest weight loss and a small reduction in blood pressure.

This combination does not replace metformin. In most cases, metformin remains the foundation, and dapagliflozin is added to it. If your GP has suggested this combination, it is usually a sign your diabetes needs more than one treatment — not that metformin has failed.

3. Metformin and antibiotics — do they interact?

Most common antibiotics are safe to take with metformin, but there are important situations where your doctor may advise caution. Metformin is cleared by the kidneys, so anything that affects kidney function or causes dehydration can increase the risk of side effects, particularly a very rare condition called lactic acidosis.

If you have a serious infection with fever, vomiting, diarrhoea, or poor fluid intake, your kidneys may be under stress. In that situation, your doctor may temporarily pause metformin until you are eating and drinking normally again. Some antibiotics — especially those containing trimethoprim — can also reduce the kidneys' clearance of metformin and temporarily raise metformin levels in your blood.

Always tell any doctor, dentist, or pharmacist who prescribes you a new medicine that you take metformin. This simple step helps avoid problems before they start.

4. What is the PBS listing for metformin?

Metformin is one of the most affordable diabetes medicines in Australia because it is listed on the Pharmaceutical Benefits Scheme (PBS) for type 2 diabetes. Most metformin hydrochloride tablets — including 500 mg, 850 mg, and 1000 mg strengths — are available as PBS-subsidised prescriptions.

For standard type 2 diabetes use, metformin does not usually require an authority approval. This means your GP can simply write a normal PBS prescription, and you can fill it at any Australian pharmacy. As a guide, the standard PBS co-payment in 2025 is around $31.60 for general patients and $7.70 for concession card holders. If you reach the PBS Safety Net during the year, your medicines may become cheaper or free. Some brands and private prescriptions may cost more, so ask your pharmacist about the most affordable PBS brand.

5. Metformin in adolescents with type 2 diabetes in Australia

Type 2 diabetes is no longer only an adult disease. In Australia, more adolescents are being diagnosed with type 2 diabetes, often linked to excess weight, family history, and lifestyle factors. This worries parents and teens — understandably, nobody wants a young person to start insulin or face long-term complications early in life.

Here in Australia, metformin is TGA-approved for children and adolescents aged 10 years and older with type 2 diabetes, and it can be prescribed on the PBS when clinically appropriate. It is usually the first oral medicine started after lifestyle changes have not been enough to control blood glucose. For adolescents, metformin offers a needle-free option that does not cause significant weight gain and rarely causes hypos when used alone.

The usual approach is to start low — often 500 mg once daily with food — and increase gradually as tolerated. Regular monitoring of growth, kidney function, and vitamin B12 levels is part of good care.

6. Does metformin reduce microvascular complications?

Yes, indirectly but importantly. Microvascular complications are the small-vessel damage that diabetes can cause in the eyes, kidneys, and nerves — leading to vision loss, kidney failure, foot ulcers, and amputation. These are the complications many people over 30 fear most.

The landmark UK Prospective Diabetes Study (UKPDS) and long-term follow-up showed that improving glucose control in type 2 diabetes significantly reduces microvascular complications. Metformin's ability to lower HbA1c by about 1% to 1.5% therefore translates into meaningful protection. In major diabetes studies, each 1% drop in HbA1c is associated with roughly a 35% reduction in microvascular complications over time.

Metformin does not make diabetes disappear, and you still need regular eye checks, foot checks, kidney tests, and blood pressure control. But it is a proven foundation for lowering your long-term risk.

7. Can metformin cause hypoglycaemia?

This is one of the most common concerns I hear: “Will this tablet make my sugar drop too low?”

The short answer is that metformin alone rarely causes hypoglycaemia. Unlike some other diabetes medicines, metformin does not push the pancreas to release extra insulin. Instead, it reduces the liver's glucose output and improves your body's sensitivity to insulin. That means your blood glucose comes down in a smoother, more controlled way.

However, hypoglycaemia can occur if metformin is combined with other diabetes medicines, especially sulfonylureas such as gliclazide, glibenclamide, or glimepiride, or with insulin. It can also happen if you skip meals, drink excessive alcohol, or have severely reduced kidney function.

If you take metformin alone and feel shaky, sweaty, or dizzy, do not assume it is a hypo without checking. But if you have those symptoms, treat them promptly with fast-acting glucose and speak to your doctor. Always keep a hypo plan if you take any diabetes medicine that can lower blood glucose more strongly.

8. When to go to emergency for metformin side effects

Most metformin side effects are mild and settle within the first few weeks. Nausea, diarrhoea, and abdominal discomfort are common when starting, and they can often be reduced by taking the tablet with food and increasing the dose slowly. However, there is a rare but serious side effect called lactic acidosis that requires urgent medical attention.

Also seek urgent medical help if you have severe dehydration from gastroenteritis, cannot keep fluids down, or have signs of very low blood glucose that do not improve with fast-acting glucose. Lactic acidosis is extremely rare when metformin is used correctly and kidney function is monitored, but knowing the warning signs can save your life.

Action: Your Next Steps After Reading This

If you are over 30 and living with type 2 diabetes, prediabetes, or you have been told your blood sugar is rising, metformin is one of the safest, cheapest, and most effective foundations of treatment. It does not replace healthy eating, regular movement, or weight management — but it makes those efforts work better and protects you from long-term damage.

Here is exactly what to do next:

• Book a GP appointment: Ask for a diabetes review including HbA1c, kidney function, blood pressure, and a foot and eye check.
• Ask your doctor if metformin is right for you: If you have type 2 diabetes and have not started it, ask why. If you are on other diabetes medicines, ask whether metformin should still be part of your plan.
• Request a PBS prescription: If metformin is suitable, ask for a PBS-subsidised script. Most people can get it for a standard co-payment, and generic brands are very affordable.
• Start low and go slow: To reduce stomach upset, ask your GP about starting with 500 mg once daily with dinner, then increasing gradually as directed.
• Store it properly: Keep your metformin in a cool, dry place — not the bathroom — and out of reach of children.
• Know the red flags: Re-read the emergency symptoms above. If you feel severely unwell, don't wait — seek urgent medical care.

Disclaimer: This article is general information only and does not replace individual medical advice. Treatment decisions should always be made with a registered Australian medical practitioner who knows your medical history, kidney function, and current medicines.