Heartburn & Reflux Relief in Australia: The OTC Ladder Explained

That hot, burning feeling behind the breastbone after a big dinner is one of the most common reasons Australians wander into a pharmacy. The aisle, though, can be confusing: shelves of antacids next to tablets promising '24-hour' relief, all claiming to sort out reflux. They are not the same thing, and reaching for the wrong one can mean waiting hours for relief that was never going to come quickly. This guide decodes the over-the-counter 'ladder' — antacids, H2 blockers and proton pump inhibitors — so you can match the right option to how often, and how badly, you get heartburn.

What heartburn and acid reflux actually are

Heartburn is a burning sensation behind the breastbone, often rising towards the throat. It happens when acidic stomach contents flow back up into the oesophagus (the food pipe) — a process called acid reflux. A muscular valve at the bottom of the oesophagus, the lower oesophageal sphincter, normally keeps stomach contents where they belong. When it relaxes at the wrong time or comes under pressure, acid can escape upwards and irritate the unprotected lining of the oesophagus.

Occasional heartburn is very common and usually nothing to worry about. When reflux happens regularly — more than about twice a week — it may be gastro-oesophageal reflux disease, known in Australia as GORD (you may see it spelled GERD in American sources; it is the same condition). Frequent or persistent symptoms are worth discussing with your GP rather than managing with over-the-counter products indefinitely.

The OTC ladder decoded: antacids, H2 blockers and PPIs

Over-the-counter reflux products fall into three groups. They differ in how they work, how fast they act, how long they last, and the kind of heartburn they suit. Think of it as a ladder you step up only as far as you need to.

Rung 1: Antacids — fast relief for the occasional burn

Antacids neutralise acid that is already sitting in your stomach. Because they act on existing acid rather than changing how much you make, they work quickly — often within minutes — but the effect is short-lived, usually lasting one to three hours. They are best suited to occasional, predictable heartburn, such as after a rich or spicy meal. In Australia you will recognise brands like Mylanta and Quick-Eze, which neutralise acid, and Gaviscon, which contains an alginate that forms a gel-like barrier on top of the stomach contents — a feature that may help keep acid down when you are upright or lying back. Antacids are handy to keep on hand, but reaching for them most days is a sign to talk to your pharmacist about a better-matched option.

Rung 2: H2 blockers (famotidine) — slower, longer-lasting

H2 blockers, or histamine-2 receptor antagonists, reduce acid production by blocking one of the chemical signals that tells the stomach to make acid. The over-the-counter H2 blocker available in Australia is famotidine. It does not act as fast as an antacid — onset is generally around 30 to 60 minutes — but the effect lasts much longer, up to about 12 hours. That makes famotidine a reasonable middle option for predictable, longer-lasting symptoms, such as night-time reflux, where a dose taken ahead of time may help manage symptoms through the evening. (Note: ranitidine, once sold as Zantac, is no longer available in Australia, so famotidine is the H2 blocker you will find on the shelf.)

Rung 3: PPIs (esomeprazole, omeprazole, pantoprazole) — for frequent reflux

Proton pump inhibitors, or PPIs, switch off the stomach's acid 'pumps' at the source, substantially reducing how much acid is produced. Active ingredients include esomeprazole (Nexium 24HR), omeprazole and pantoprazole (sold under names such as Somac). The trade-off for that stronger acid control is speed: PPIs are not for instant relief. They take one to four days of consistent daily use to reach full effect, so they suit people with frequent symptoms rather than a one-off flare. Over-the-counter PPIs are intended for short courses — typically up to two weeks without GP advice — taken once daily, usually 30 to 60 minutes before breakfast. If your symptoms are frequent enough to need a PPI, it is worth seeing your GP so the underlying reflux can be properly assessed.

Heartburn relief at a glance

This table is the quick reference for which rung of the ladder fits your situation. Match it to how often you get heartburn and how fast you need relief, then check the cautions.

Lifestyle and trigger management

Medicines are only half the story. For many people, adjusting everyday habits can reduce how often reflux flares — and may mean reaching for the medicine cabinet less. These steps are low-risk and worth trying alongside any over-the-counter option.

• radio_button_uncheckedEat smaller meals more often rather than large ones, which put pressure on the valve at the top of the stomach.
• radio_button_uncheckedAvoid eating in the two to three hours before bed, so the stomach is emptier when you lie down.
• radio_button_uncheckedRaise the head of the bed (or use a wedge pillow) if night-time reflux is a problem — propping up with extra pillows alone is less effective.
• radio_button_uncheckedIdentify and cut back on personal triggers. Common ones include fatty or fried foods, spicy meals, chocolate, coffee, alcohol, fizzy drinks, and acidic foods such as citrus and tomato.
• radio_button_uncheckedIf you carry extra weight around the middle, losing some may reduce pressure on the stomach and ease symptoms.
• radio_button_uncheckedQuit or cut down smoking, which can relax the lower oesophageal sphincter and worsen reflux.
• radio_button_uncheckedLoosen tight belts or waistbands, which increase pressure on the abdomen.

Heartburn in pregnancy

Heartburn is very common in pregnancy, particularly in the later months, as hormonal changes and a growing baby put more pressure on the stomach. The first steps are usually the lifestyle measures above — smaller meals, avoiding late-night eating, and propping up in bed. When something more is needed, alginate-based antacids such as Gaviscon are often preferred during pregnancy, but the safest course is always to check with your pharmacist or GP before taking any reflux medicine while pregnant or breastfeeding. They can confirm what is appropriate for your stage of pregnancy and your situation.

Red flags: when heartburn needs a doctor

Most heartburn is harmless and responds to the steps above. But some symptoms are warning signs that should not be managed with over-the-counter products. See your GP promptly if you notice any of the following.

• radio_button_uncheckedDifficulty or pain when swallowing, or a sensation of food getting stuck
• radio_button_uncheckedUnintentional weight loss alongside reflux symptoms
• radio_button_uncheckedVomiting blood, or stools that are black and tarry — possible signs of bleeding in the gut
• radio_button_uncheckedHeartburn or reflux that persists for more than two weeks despite over-the-counter treatment
• radio_button_uncheckedSymptoms that keep returning month after month, or that regularly wake you at night
• radio_button_uncheckedYou are over 50 with new or changed reflux symptoms
• radio_button_uncheckedPersistent nausea or vomiting

Frequently Asked Questions

What gives the fastest heartburn relief?

For speed, an antacid is usually the quickest option — products such as Mylanta, Gaviscon and Quick-Eze neutralise acid already in the stomach and may help relieve heartburn within minutes. H2 blockers (famotidine) and PPIs (such as Nexium 24HR) work more slowly because they reduce acid production rather than mopping up what is already there, so they are not the right choice when you want relief right now.

How can I tell if it's just heartburn?

Classic heartburn is a burning feeling behind the breastbone, often rising towards the throat, that tends to follow meals, lying down or bending over, and frequently eases with an antacid. Pain that is crushing or tight, spreads to the arm, jaw, neck or back, or comes with breathlessness, sweating or nausea is not typical heartburn and could be coming from the heart. If you are unsure, treat it as possibly cardiac and seek urgent help — call 000 in Australia.

When should I use a PPI instead of an antacid?

Antacids suit occasional heartburn because they act fast but wear off quickly. Consider a short course of a PPI (such as esomeprazole in Nexium 24HR) when symptoms are happening around two or more days a week despite antacids, because PPIs control acid for longer. Bear in mind PPIs take one to four days of daily use to reach full effect and are meant for short over-the-counter courses of up to two weeks. If you need them beyond that, see your GP.

How long does it take for heartburn medicine to work?

It depends on the type. Antacids may ease symptoms within minutes. H2 blockers (famotidine) generally take around 30 to 60 minutes to start working but may last up to 12 hours. PPIs take longer still — one to four days of consistent daily use to reach their full effect — which is why they are used for frequent reflux rather than a sudden flare.

Is it safe to take antacids every day?

Occasional antacid use is fine for most adults. But needing them most days suggests an underlying reflux problem that is better assessed than masked. Daily antacid use for more than two weeks is a good reason to see your GP, who can check what is going on and may suggest a different approach. Always read the label and follow the directions for use, and ask your pharmacist if you take other regular medicines, as some antacids can affect how other medicines are absorbed.

Can children take heartburn medicines?

Many over-the-counter reflux products are intended for adults and older children, and dosing for younger children is not the same. If a child is having reflux symptoms, do not assume an adult product is suitable — see your pharmacist or GP for advice on what, if anything, is appropriate and at what dose.