The maximum amount of Gaviscon you can take depends on which product you’re using. For Gaviscon Extra Strength chewable tablets, the limit is 16 tablets in 24 hours. For Gaviscon Advance liquid, the standard dose is 10 ml up to four times a day. Staying within these limits matters because exceeding them, especially over time, can cause side effects ranging from constipation to mineral buildup in your body.
Dosage Limits by Product
Gaviscon comes in several formulations, and the maximum dose differs for each one. The most important thing is to check the specific product you have in hand, because “Gaviscon” on one box can mean a very different formula than “Gaviscon” on another.
For Gaviscon Extra Strength chewable tablets (the common U.S. version containing aluminum hydroxide and magnesium carbonate), the ceiling is 16 tablets per 24-hour period. For Gaviscon Advance oral suspension, widely available in the UK, the recommended dose is 5 to 10 ml after meals and at bedtime, up to four times a day. Adults and children 12 and over follow the same dosing. Children under 12 should only take Gaviscon on medical advice.
When and How to Take It
Gaviscon works by forming a gel-like barrier on top of your stomach contents, which physically blocks acid from splashing up into your esophagus. That barrier is most useful right after eating, when your stomach is full and reflux is most likely. Taking it at bedtime adds a second layer of protection for the hours you spend lying flat.
If you’re using the liquid form, measure carefully with the cup or spoon provided rather than eyeballing it. With chewable tablets, chew them thoroughly before swallowing so the ingredients can mix with your saliva and begin forming the protective layer right away.
How Long You Can Keep Taking It
Gaviscon is not meant for indefinite daily use. The labeling on Extra Strength tablets states you should not use the maximum dosage for more than 2 weeks. If your symptoms persist beyond that window, something more than occasional heartburn may be going on, and a longer-term treatment plan is worth discussing with a doctor.
Occasional use for a flare-up after a heavy meal is a different situation from taking the maximum dose every day for weeks on end. The two-week rule specifically applies to sustained, high-dose use.
What Happens If You Take Too Much
Gaviscon contains aluminum and magnesium compounds. Your body normally eliminates most of the aluminum through your digestive tract, but some does get absorbed into the bloodstream. At normal doses this is insignificant. At high or prolonged doses, aluminum can accumulate, and magnesium from the formula can also build up systemically. This is a particular concern if you have kidney disease or kidney stones, because impaired kidneys are less efficient at clearing these minerals.
Signs that you may be overdoing it include severe constipation, stomach pain, or swelling in your ankles or feet. Blood in your stool or coughing up blood are more urgent signals to stop taking it and get medical attention immediately.
Sodium Content Worth Knowing
One detail that catches people off guard: Gaviscon contains a meaningful amount of sodium. A full day’s worth of Gaviscon Advance at maximum dose delivers roughly 23% of the WHO’s recommended daily sodium limit. If you’re watching your salt intake for blood pressure or heart health, that’s a significant chunk of your daily budget coming from an antacid alone, on top of whatever sodium is already in your food.
Medications That Need a Time Gap
Gaviscon can interfere with how your body absorbs a long list of other medications. The general rule is to leave at least a 2-hour gap before or after taking any of the following:
- Thyroid medication (levothyroxine)
- Antibiotics (quinolones and tetracyclines)
- Iron supplements
- Heart medications (beta blockers)
- Antifungal medications
- Bone-health drugs like alendronic acid
- Steroids, antihistamines, and antipsychotic medications
Paracetamol (acetaminophen) is safe to take at the same time. Other painkillers like ibuprofen or aspirin should not be combined with Gaviscon without checking first, partly because those drugs can irritate the stomach lining in ways that complicate reflux.
Use During Pregnancy and Breastfeeding
Gaviscon is one of the more commonly recommended antacids during pregnancy, when heartburn tends to be frequent and many other medications are off the table. It is considered safe for both pregnant and breastfeeding women at standard doses. The active ingredients do not pass into breast milk in amounts that would affect a baby. The key is sticking to the recommended dose rather than increasing it to cope with persistent symptoms, especially given the sodium and mineral content discussed above.