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Let me be direct with you. If you’re an Australian over 30 and you’ve been told your blood sugar is creeping up, you’re living with type 2 diabetes or PCOS, or you’re simply worried about your metabolism and the long game of ageing, you’ve probably felt the fear. Fear of needles. Fear of gaining even more weight. Fear of expensive medications. Fear of making things worse. That’s exactly why metformin remains one of the most prescribed medicines in this country — and one of the most trusted by doctors like me. But don’t just take my word for it. Let’s look at the evidence, the real-world experience, and the questions I hear every single day in my clinic.
Metformin works quietly in the background. It reduces the amount of glucose your liver produces, helps your muscles use sugar more efficiently, and improves your body’s sensitivity to insulin. It doesn’t push your pancreas to pump out extra insulin, so the risk of dangerous hypoglycaemia is very low when it’s used on its own. It’s a tablet, not an injection. It’s on the PBS, so if you have type 2 diabetes, a month’s supply can cost less than a takeaway coffee. And it has been used for over 60 years, with an extraordinary safety record that few modern medicines can match.
Now, you might have heard some confusing things: “It causes a metallic taste.” “You can’t take it on an empty stomach.” “Is semaglutide better?” “Do I need to stop it before a pregnancy test?” Let’s settle those questions once and for all.
This is the question I hear most often, especially with all the media attention on semaglutide (Ozempic, Wegovy). Both are excellent medicines, but they work differently and serve different purposes. Semaglutide is a once-weekly injection that mimics a gut hormone to reduce appetite and slow stomach emptying. It can produce significant weight loss, but it also comes with a higher price tag, potential injection-site reactions, and very common nausea — especially in the first few weeks.
| Feature | Metformin | Semaglutide (Ozempic/Wegovy) |
|---|---|---|
| How it’s taken | Oral tablet, once or twice daily | Subcutaneous injection, once weekly |
| Cost to you | Very low — PBS subsidised for type 2 diabetes; generic options available | Higher — PBS restricted to specific diabetes situations; often more expensive, supply issues common |
| Effect on weight | Weight neutral or modest weight loss (1–3 kg for some people) | Significant weight loss (often 5–10 kg or more) |
| Risk of hypoglycaemia | Very low when used alone | Low when used alone |
| Common side effects | Nausea, diarrhoea, metallic taste — mostly early and manageable | Nausea, vomiting, diarrhoea, constipation — can be more intense initially |
| Long-term safety data | Extensive, 60+ years of clinical use | Shorter but growing; very good cardiovascular data |
| Best role | First-line for type 2 diabetes; also used in PCOS and GDM | Add-on when metformin is not enough, or when significant weight loss/cardiovascular benefit is a priority |
So which is better? For most people starting out with type 2 diabetes, metformin is the wise and affordable first choice. Semaglutide is a powerful tool, but it doesn’t replace metformin — the two are often used together. If you want maximum benefit with minimum complexity and cost, metformin is the foundation.
Technically, yes — but I strongly recommend against it in most cases. Metformin is much better tolerated when taken with food or immediately after a meal. Taking it on an empty stomach significantly increases the chance of nausea, bloating, cramping, and diarrhoea. These side effects are the most common reason people give up on metformin too early.
| Do this | Why it helps |
|---|---|
| Take with your largest meal of the day | Food slows the absorption and reduces direct irritation to the stomach lining |
| Start with a low dose (e.g. 500 mg with dinner) | Allows your gut to adapt over several weeks |
| Increase the dose slowly every 1–2 weeks | Reduces nausea and diarrhoea dramatically |
| Ask about the extended-release (XR) version | Releases the medicine more gradually, causing fewer gut side effects |
If you forget a dose and need to take it on an empty stomach, a small glass of milk or a cracker can make all the difference. But for daily use, food is your friend.
Yes — and this is one of the most commonly reported, yet least talked about, side effects. Around 1 in 10 people notice a strange metallic or bitter taste in the first few weeks of taking metformin. It happens because a small amount of the drug can be excreted in saliva. The good news? It usually fades within a few weeks as your body adjusts. But while it lasts, it can be unpleasant and may make food taste different.
Some practical tips to manage the metallic taste:
This is a very common scenario, and it needs to be done carefully — never stop your current diabetes medicine abruptly. The exact approach depends on which medicine you’re currently taking, your blood sugar levels, and your kidney function. Always work with your GP or endocrinologist.
| Step | What happens |
|---|---|
| 1. Medical review | Your doctor checks your HbA1c, kidney function (eGFR), and current medication list. |
| 2. Start low | Begin metformin at 500 mg once daily with the evening meal while continuing your current medicine. |
| 3. Increase gradually | Add a second 500 mg dose with breakfast after 1–2 weeks, then increase as needed up to 1000 mg twice daily or the maximum tolerated dose. |
| 4. Monitor blood sugar | Check fasting and post-meal glucose levels regularly, especially if you are switching from a sulfonylurea (e.g. gliclazide) or insulin. |
| 5. Taper the old drug | Only after metformin has reached a stable dose and your sugars are improving will your doctor gradually reduce or stop the previous medication. |
If you’re switching from a medicine that can cause hypoglycaemia (like a sulfonylurea or insulin), your doctor will monitor you more closely and may reduce the old drug sooner to avoid low blood sugar. Switching to metformin often leads to fewer hypos, less weight gain, and lower cost — but it must be done step by step.
No. You do not need to stop metformin before taking a pregnancy test. In fact, for women with PCOS, metformin can help regulate ovulation and may support early pregnancy. If your pregnancy test is positive, do not stop metformin on your own — contact your doctor straight away. In many cases metformin is continued during pregnancy, especially if you have type 2 diabetes, PCOS, or develop gestational diabetes. It crosses the placenta, but decades of clinical use and modern guidelines support its use when the benefits outweigh the risks. Your doctor may adjust the dose or add other treatments if needed, but stopping suddenly can cause blood sugar levels to rise, which is not good for you or the baby.
This is one of the most exciting areas of research in modern medicine. Metformin has been shown to influence pathways linked to ageing — it activates an enzyme called AMPK, which mimics some benefits of calorie restriction, reduces inflammation, improves insulin sensitivity, and may protect against age-related diseases. In large observational studies, people with type 2 diabetes who took metformin had lower rates of heart disease, cancer, and even dementia compared with people taking other diabetes drugs. Animal studies have shown extended lifespan in some models.
However, metformin is not yet approved as an anti-aging treatment in Australia. The landmark TAME trial is currently testing whether metformin can delay the onset of age-related conditions in healthy older people. If that trial is positive, it could change how we approach ageing itself. For now, if you have type 2 diabetes, prediabetes, or PCOS, the metabolic benefits are clear — and the possible long-term healthspan benefits are an intriguing bonus that many doctors, myself included, find incredibly compelling.
Metformin is listed on the Pharmaceutical Benefits Scheme (PBS) for the treatment of type 2 diabetes mellitus. This means your GP can prescribe it without complex authority paperwork, and you can buy it at a subsidised price from any pharmacy in Australia.
| Item | Details |
|---|---|
| PBS indication | Type 2 diabetes mellitus |
| Available forms | Immediate-release tablets: 500 mg, 850 mg, 1000 mg Extended-release (XR) tablets: 500 mg, 750 mg, 1000 mg |
| Typical patient co-payment | As low as $7.70 for concession card holders; around $31.60 general, with many generic brands even cheaper due to PBS price disclosure |
| Prescriber requirements | No complicated authority approval for type 2 diabetes — your GP can simply prescribe it |
For a medicine you may take for many years, that affordability is a massive relief. Compare that to some newer diabetes drugs that can cost hundreds of dollars per month if not PBS-subsidised, and you can see why metformin remains the backbone of diabetes care in Australia.
In gestational diabetes mellitus (GDM), metformin is increasingly used when lifestyle changes alone are not enough to control blood sugar. Australian guidelines support its use in pregnancy under specialist care. The typical starting dose is 500 mg once or twice daily with food. The dose is then increased gradually — usually by 500 mg every one to two weeks — to minimise stomach upset. Most women with GDM need between 1500 mg and 2000 mg per day, divided into two or three doses. The maximum dose is generally 2500 mg daily. Metformin may be used alone or in combination with insulin if blood sugar targets are not met.
If you are pregnant or planning a pregnancy and have been advised to take metformin, please follow your specialist’s dosing instructions closely and never change the dose without medical advice.
If you’re over 30, and you’ve been watching your blood sugar, your weight, or your long-term health with growing concern, metformin could be the affordable, proven, oral medication that fits your life. It doesn’t require needles. It won’t cause dangerous low blood sugar when used alone. It won’t make you gain weight. And it has a 60-year track record of safety. The side effects you’ve heard about — metallic taste, stomach upset — are real but usually temporary and manageable with the right start-low, go-slow approach.
Don’t let fear or confusion hold you back. Book an appointment with your GP and ask one simple question: “Is metformin right for me?” It might be the best conversation you have for your future health.
This article is general information from a doctor’s perspective and does not replace individual medical advice. Always consult your GP or specialist before starting, stopping, or changing any medication.
