Gaviscon liquid is taken by swallowing the recommended amount directly from a measuring spoon or cup, after meals and at bedtime. The standard adult dose is 10 to 20ml up to four times a day. Getting the timing right matters more than you might expect, because the way Gaviscon works is fundamentally different from a typical antacid.
How Gaviscon Liquid Works
Unlike antacids that simply neutralize stomach acid, Gaviscon contains alginate, a compound derived from seaweed that reacts with your stomach acid to form a gel-like layer. Carbon dioxide gets trapped inside this gel, causing it to float on top of your stomach contents like a raft sitting on water. This physical barrier stops acid from splashing back up into your esophagus, which is what causes the burning sensation of heartburn and reflux.
The raft can stay intact in your stomach for several hours, giving you longer-lasting relief than traditional antacids that wash away more quickly. This is why timing your dose correctly is so important: you want that raft forming right when acid reflux is most likely to happen.
When and How Much to Take
The standard adult dose is 10 to 20ml taken after meals and at bedtime, up to four times a day. That means you might take it after breakfast, after lunch, after dinner, and again before you go to sleep. Taking it at bedtime is especially useful because lying down makes it easier for acid to travel upward.
Take it whether or not you’re experiencing symptoms at that moment. Pain and discomfort from reflux tend to be worse after eating and at night, so dosing at these times works as prevention rather than just treatment. Shake the bottle before measuring your dose, and use the measuring cup or spoon that comes with the product rather than guessing with a kitchen spoon.
You can swallow the liquid on its own without mixing it with water. In fact, drinking a large amount of water right after may dilute the mixture before it has time to form the protective raft in your stomach.
Differences Between Formulations
Gaviscon comes in regular strength and extra strength versions, and the dose volume differs between them. For regular strength, the typical dose is one to two tablespoonfuls (roughly 15 to 30ml) four times a day. For extra strength, it’s two to four teaspoonfuls (roughly 10 to 20ml) four times a day. Always check the label on your specific bottle, since the concentration of active ingredients varies and taking the wrong amount of one formulation could mean you’re getting too much or too little.
Spacing Gaviscon Around Other Medications
Gaviscon can interfere with how your body absorbs a surprisingly long list of medications. The general rule is to leave at least a two-hour gap before or after taking any of the following:
- Thyroid medication (levothyroxine)
- Antibiotics (particularly quinolones and tetracyclines)
- Iron supplements
- Antihistamines
- Beta blockers for heart conditions
- Antifungal medications
- Steroids for inflammatory conditions
- Bisphosphonates like alendronic acid for osteoporosis
- Antipsychotic medications
- Chloroquine for malaria
Paracetamol (acetaminophen) is safe to take at the same time as Gaviscon. Other painkillers like ibuprofen or aspirin should not be combined with Gaviscon without checking with a pharmacist first, since they can irritate the stomach lining and complicate reflux symptoms.
Safety During Pregnancy and Breastfeeding
Gaviscon is one of the more commonly recommended options for heartburn during pregnancy, which affects the majority of pregnant women, particularly in the third trimester. Clinical studies involving more than 500 pregnant women showed no harmful effects on the developing baby. It’s also considered safe while breastfeeding, with no effects observed in breastfed infants.
That said, stick to the recommended dose. Some Gaviscon formulations contain sodium, which can contribute to fluid retention, something many pregnant women are already dealing with. Let your midwife or doctor know you’re using it so they can factor it into your overall care.
Side Effects
Gaviscon is well tolerated by most people. Side effects are rare but can include nausea, constipation, or diarrhea depending on the specific formulation. These tend to be mild and resolve on their own.
A serious allergic reaction is extremely rare but possible. Signs include sudden swelling of the lips, mouth, throat, or tongue, difficulty breathing, or a rash that is raised, blistered, or peeling. This requires emergency medical attention immediately.
How Long You Can Use It
Gaviscon is designed for short-term symptom relief. If you find yourself reaching for it every day for more than two weeks, that’s a signal your reflux may need a different approach. Persistent symptoms can indicate conditions like gastroesophageal reflux disease (GERD) that benefit from longer-term treatment strategies. Occasional use for predictable triggers, like a heavy meal or eating late at night, is fine on an ongoing basis.