A doctor's perspective for Australians over 30 who want safe, affordable, effective blood sugar control.
As a GP in Australia, I see the same worried look every week. A patient over 30 sits down with blood test results showing "glucose: 6.5 mmol/L" or "HbA1c: 6.5%". They are tired, carrying extra weight around the middle, and terrified of needles, dialysis, blindness, or losing a foot. They have heard that newer diabetes drugs cost hundreds of dollars a month and require injections. Many are also worried about their liver, their muscles, and whether a medicine will make them feel worse.
If that sounds familiar, I want to introduce you to the medicine I still reach for first: metformin. It is not new, it is not glamorous, and it will not make headlines on social media. But it is one of the safest, cheapest, and most reliable diabetes medicines available in Australia today.
In this article, I will answer the common questions I hear in my clinic, using plain language and real-world Australian context. By the end, you will understand why metformin remains the backbone of type 2 diabetes care — and why you may want to ask your GP about it.
Type 2 diabetes is not simply "too much sugar in the blood." The real problem is that your body becomes resistant to its own insulin, and your liver keeps releasing extra glucose even when you do not need it. Metformin attacks this problem from several angles:
Unlike some diabetes medicines, metformin does not cause weight gain and very rarely causes hypoglycaemia (dangerously low blood sugar) when used on its own. This is a huge advantage for busy Australians over 30 who drive, work, exercise, or care for children and cannot afford sudden dizzy spells.
This is one of the most common concerns I hear. Many patients say, “I’m scared of diabetes tablets because they can damage the liver.” Let me reassure you: metformin is not a liver toxin. In fact, research suggests it may improve fatty liver, a condition that often travels with type 2 diabetes and being overweight.
Metformin works partly in the liver, but it does not damage healthy liver cells. It is not metabolised by the liver like many drugs; it is excreted unchanged by the kidneys. The main caution is for people with advanced cirrhosis or severe liver failure, because a poorly functioning liver may not clear lactate efficiently, and this could increase the risk of a rare condition called lactic acidosis. For the average person with mildly abnormal liver enzymes or simple fatty liver, metformin is generally safe and may even be beneficial.
| Liver Concern | What You Need to Know |
|---|---|
| Fatty liver (very common after 30) | Metformin may help reduce liver fat and is often used safely. |
| Mildly raised liver enzymes | Usually not a reason to avoid metformin; your GP will investigate the underlying cause. |
| Advanced cirrhosis or severe liver failure | Metformin should be avoided because of a theoretical increased risk of lactic acidosis. |
| Routine liver function monitoring | Not required solely because of metformin; your GP may check liver tests if you have other risk factors. |
Semaglutide — sold as Ozempic and Wegovy — has become famous for weight loss and powerful blood sugar lowering. It is an excellent medicine, but it is not a replacement for metformin for most people starting diabetes treatment. In many cases, the right answer is not "either/or" but "metformin first, semaglutide later if needed."
| Feature | Metformin | Semaglutide |
|---|---|---|
| Drug class | Biguanide | GLP-1 receptor agonist |
| How you take it | Oral tablet, once or twice daily | Weekly injection (or daily oral version) |
| Average HbA1c lowering | About 1.0–1.5% | About 1.5–1.8% |
| Effect on weight | Weight neutral or modest loss (1–3 kg) | Significant weight loss (5–15 kg or more) |
| Hypoglycaemia risk | Very low when used alone | Low alone, but can cause low sugar with insulin or sulfonylureas |
| PBS status in Australia | Unrestricted benefit, no authority required | Restricted — only subsidised for certain patients with type 2 diabetes and high cardiovascular risk or other criteria |
| Typical cost | From about $7.70 concession / around $30 general per month | Can cost $150–$400+ per month if not PBS-subsidised |
| Common side effects | Nausea, diarrhoea, metallic taste — usually temporary | Nausea, vomiting, reduced appetite |
| Best for | First-line treatment for most people with type 2 diabetes | Add-on therapy when weight loss or cardiovascular/renal protection is a priority |
The verdict? Metformin is the sensible foundation. It is oral, affordable, well-studied for over 60 years, and has an excellent safety record. Semaglutide is a valuable add-on but comes with needles, higher cost, and more restrictions. Most Australian GPs — including me — start with metformin and add semaglutide only if you need more help.
Muscle pain is not a common side effect of metformin, but it can happen indirectly. Here is what I tell my patients:
If you experience muscle pain while taking metformin, see your GP. We may check your vitamin B12, kidney function, and sometimes a muscle enzyme (CK) test. Usually, we can solve the problem without stopping metformin — for example, by adding a B12 supplement.
Metformin overdose is serious but very rare when the medicine is taken as prescribed. In overdose, the main danger is metformin-associated lactic acidosis (MALA), where lactate builds up in the blood and makes it dangerously acidic.
| Treatment Step | What Happens |
|---|---|
| Emergency care | Call 000 or go to an emergency department immediately. |
| Assessment | Doctors measure blood lactate, pH, electrolytes, and kidney function. |
| Supportive care | IV fluids, glucose, and sometimes sodium bicarbonate to correct blood acidity. |
| Haemodialysis | The most effective way to remove metformin from the blood and rapidly correct severe acidosis. Used in serious cases. |
The best treatment is prevention: never take more than your prescribed dose, and stop metformin temporarily during severe vomiting, diarrhoea, or dehydration. If you suspect an overdose, treat it as an emergency.
This is a common frustration with many newer diabetes medicines — phone calls, paperwork, and waiting for approval. The good news? Metformin is an unrestricted PBS benefit. That means your GP can write a normal PBS prescription without calling Medicare or seeking authority approval. You simply take the script to any Australian pharmacy.
| Question | Answer for Metformin in Australia |
|---|---|
| Is metformin on the PBS? | Yes |
| Do I need authority approval? | No — it is an unrestricted benefit for diabetes |
| How much does it cost? | From about $7.70 for concession card holders and around $30 for general patients, depending on pack |
| What strengths are available? | 500 mg, 850 mg, and 1000 mg tablets, including extended-release forms |
The Royal Australian College of General Practitioners (RACGP) and Diabetes Australia recommend metformin as the first-line glucose-lowering medicine for most adults with type 2 diabetes, alongside lifestyle changes. Here is how your GP will typically start it:
| Step | What Your GP Will Do |
|---|---|
| Before starting | Check kidney function (eGFR), HbA1c, and discuss diet, exercise, and weight goals. |
| Starting dose | 500 mg once or twice daily with food to reduce stomach upset. |
| Titration | Increase by 500 mg every 1–2 weeks as tolerated, usually up to 1–2 g per day. |
| Maximum dose | Up to 2.5–3 g per day in divided doses, though most people need only 1–2 g daily. |
| Monitoring | Review HbA1c at 3 months; check kidney function at least yearly. |
| If stomach upset occurs | Take with meals or switch to extended-release metformin. |
Metformin-associated lactic acidosis (MALA) is extremely rare — estimated at only a few cases per 100,000 patient-years — and almost always occurs in people with severely reduced kidney function or acute illness. Australian GPs are trained to prevent it by following simple safety rules.
| Situation | Action to Prevent MALA |
|---|---|
| eGFR below 30 mL/min | Do not start metformin; stop it if already taking. |
| eGFR 30–45 mL/min | Use with caution; your GP may reduce the dose and monitor more often. |
| Acute vomiting, diarrhoea, or dehydration | Temporarily stop metformin and restart once you are eating and drinking normally. |
| Severe infection, heart failure, or low oxygen | Withhold metformin until you recover. |
| Iodinated contrast dye (e.g., CT scan with contrast) | Your doctor may withhold metformin if your eGFR is low; restart after 48 hours if kidney function is stable. |
| Excess alcohol | Avoid binge drinking, as it increases the risk of lactic acidosis. |
These rules are simple and make metformin safe for the vast majority of people. In my practice, I rarely need to stop metformin, and when I do, it is usually only for a few days during illness.
After reading all this, you might wonder why a medicine discovered decades ago still matters in an age of high-tech diabetes treatments. The answer is simple: metformin does its job quietly, safely, and affordably.
I know that living with type 2 diabetes after 30 can feel like a life sentence of sacrifice. You worry about losing your energy, your mobility, your independence. You want a treatment that fits into your real life — not one that takes it over. Metformin is that treatment for millions of Australians.
It is not a miracle cure. You still need to eat well, move your body, and manage your weight. But metformin gives you a powerful, proven tool to protect your kidneys, eyes, nerves, and heart from the silent damage of high blood sugar. And it does so without bankrupting you or forcing you to inject yourself every week.
If you are over 30 and have been diagnosed with type 2 diabetes — or if your fasting blood sugar is creeping up — do not ignore it. High blood sugar is a quiet thief: it steals your energy, your eyesight, your kidney function, and your quality of life while you feel "fine."
You do not have to choose between expensive injections and dangerous complications. You can start with a trusted, affordable tablet that has helped millions of people take back control of their blood sugar. Talk to your GP about metformin today.
