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Metformin in Australia: A Doctor’s Honest Review for People Over 30

By a practising Australian GP — general information only, not individual medical advice. Always speak with your own doctor before starting or changing any medicine.

Attention: Are You Tired of Watching Your Blood Sugar, Weight and Hormones Slowly Take Over Your Life?

If you are over 30 and have been told you have type 2 diabetes, prediabetes, polycystic ovary syndrome (PCOS), or stubborn weight gain around the middle, you already know the fear. You worry about your heart, your eyes, your kidneys, your fertility, your energy and the rising cost of medicines. You may have tried diet and exercise alone, but the numbers do not move enough. You may have watched friends or family start expensive injections or suffer side effects from modern diabetes drugs. You may feel confused by the hype around semaglutide. Meanwhile, one medicine has been quietly protecting millions of people for decades: metformin.

This review is written from the doctor’s point of view to help you understand why metformin is still one of the most prescribed medicines in Australia — and why it might be exactly what you need.

Interest: What Is Metformin and Why Do Australian Doctors Still Trust It?

Metformin is an oral medicine from the biguanide family. It works mainly by reducing how much glucose your liver releases into the blood and by making your body’s cells more sensitive to insulin. Unlike some diabetes medicines, metformin does not usually cause dangerous low blood sugar when used on its own, and it does not cause weight gain. In fact, many patients find it helps prevent weight gain or supports modest weight loss.

In Australia, metformin is listed on the Pharmaceutical Benefits Scheme (PBS), which means most patients pay very little. It is available as an immediate-release tablet and as an extended-release version, which can be gentler on the stomach.

Desire: Answering the Questions Australian Patients Actually Ask

1. How long to take metformin for PCOS?

If you have PCOS, metformin is usually a long-term treatment, not a quick fix. Many women need to take it for at least 6 to 12 months before seeing meaningful improvements in cycle regularity, ovulation, or metabolic markers. If you are trying to conceive, your doctor may continue metformin through early pregnancy or longer, depending on your individual situation. If your cycles improve and your insulin resistance settles, some patients can reduce or stop it, but many stay on a low dose for years to protect metabolic health.

2. Metformin and fasting: guidance for Ramadan?

For many Australian Muslims, fasting during Ramadan is important, and stopping diabetes medicines without advice can be risky. Metformin alone has a low risk of hypoglycaemia, so fasting may be possible with medical guidance. In practice, I tell my patients:

• Take your dose with the predawn meal (suhoor) and with the evening meal (iftar) if you take it twice daily.
• If you take extended-release metformin once daily, take it with iftar, the largest meal.
• Drink plenty of water during non-fasting hours.
• Monitor blood glucose more often, especially in the first few days.
• If you feel very unwell, dizzy, or have very low readings, break the fast and seek medical advice.

3. What to do if metformin causes nausea?

Nausea is the most common side effect, especially when starting treatment. But you do not have to suffer. My usual step-by-step plan is:

4. Metformin vs semaglutide: which is better?

This is not a simple contest. Both are valuable but serve different roles.

For most newly diagnosed patients, metformin remains the first-line medicine. Semaglutide may be added later or used when weight loss is a major priority, but cost, injection burden and supply issues keep it from being the first choice for everyone.

5. Can you take metformin with other supplements?

Yes, but a few points matter. The most important is vitamin B12, because metformin can lower B12 levels over years. Many Australian doctors recommend monitoring B12 and taking a supplement if needed. Other commonly used supplements:

• Vitamin D — generally safe and helpful for many Australians.
• Omega-3 fatty acids — safe for most people; may support heart health.
• Magnesium — generally fine, but avoid very high doses if kidney function is reduced.
• Folic acid — useful for women with PCOS, especially if pregnancy is possible.

If you take berberine, chromium, cinnamon, or alpha-lipoic acid, talk to your doctor or pharmacist, because some can lower glucose further and may require dose adjustments. Always space supplements at least 2 hours from metformin if you have a sensitive stomach.

6. Is metformin cheaper than other diabetes medications?

Yes, in Australia metformin is one of the least expensive diabetes medicines available on the PBS. Depending on your concession status and brand, a month’s supply often costs under $8 for concession card holders and generally under $30 for general patients. By comparison, newer diabetes medicines such as SGLT2 inhibitors, DPP-4 inhibitors, and GLP-1 receptor agonists can cost the government and patients far more. If cost is a worry, metformin is almost always the most budget-friendly starting point.

7. Metformin and cardiovascular outcomes trials in diabetes?

The landmark UK Prospective Diabetes Study (UKPDS) showed that metformin reduced diabetes-related complications, heart attack, and all-cause death in overweight people with type 2 diabetes. This legacy effect lasted for years after the trial. While newer agents have strong cardiovascular outcome trial data, metformin’s unmatched long-term safety record, low cost, and proven heart benefit keep it at the foundation of Australian diabetes care. For patients over 30, protecting the heart is often the biggest concern — and metformin has decades of evidence behind it.

8. Can metformin cause itching?

Itching is not a common side effect of metformin, but it can occur as part of an allergic skin reaction in rare cases. If you develop itching, especially with a rash, hives, swelling of the face or lips, or difficulty breathing, stop the medicine and seek urgent medical attention. If itching is mild and without rash, it may be due to dry skin or another cause, but your doctor should still assess it. Do not ignore unexplained itching, particularly if it comes with yellowing of the skin or eyes, dark urine, or abdominal pain.

Action: Take Control of Your Health Today

Metformin is not a glamorous new injection. It is a quiet, reliable, affordable tablet that has stood the test of time. For many Australians over 30, it is the smart first step toward better blood sugar control, healthier cycles, weight stability, and long-term heart protection.

If you recognise yourself in any of the pain points above, book an appointment with your GP. Ask whether metformin is right for you. With a valid prescription, you can purchase metformin at any Australian pharmacy, and the PBS keeps the cost low. Do not let fear of side effects or confusion about newer drugs stop you from accessing a medicine that has helped millions.

Your health is worth the conversation. Talk to your doctor about metformin today.