Gaviscon is considered safe during pregnancy and is one of the first treatments recommended for heartburn when lifestyle changes aren’t enough. Both Liquid Gaviscon and Gaviscon Advance are licensed for use by pregnant women. A large prospective study of pregnant women in the UK and South Africa found no safety concerns for the mother, fetus, or baby, with adverse events matching normal population rates.
How Gaviscon Works During Pregnancy
Unlike some heartburn medications that get absorbed into your bloodstream, Gaviscon works locally in your stomach. Its main ingredient, sodium alginate, reacts with stomach acid to form a gel-like “raft” that floats on top of your stomach contents. This physical barrier prevents acid from splashing back up into your esophagus, which is the burning sensation you feel.
This matters during pregnancy because the mechanism is largely mechanical rather than chemical. The raft sits in your stomach and does its job without significant absorption into your system, which is part of why it has such a strong safety profile for pregnant women.
Why Heartburn Gets Worse in Pregnancy
Heartburn affects the majority of pregnant women, and it can show up in any trimester. Hormonal changes relax the muscular valve between your esophagus and stomach, making it easier for acid to escape upward. As your baby grows, the increasing pressure on your stomach pushes contents upward too. The combination means heartburn often gets progressively worse as pregnancy continues, peaking in the third trimester.
Dosage and How to Take It
The typical dose is 10 to 20 mL of the liquid suspension, taken as needed to relieve symptoms. The maximum is 80 mL per day. Follow the instructions on the specific product you buy, since formulations vary. Taking it after meals and before bed tends to provide the most relief, since those are the times acid reflux is most likely to flare.
Sodium Content Worth Knowing About
One thing to be aware of: Gaviscon contains sodium. A 20 mL dose of Gaviscon Extra contains about 256 mg of sodium, and if you take the maximum daily amount, you’d be getting roughly half of the World Health Organization’s recommended daily sodium limit from Gaviscon alone, before counting anything you eat.
For most pregnant women, this isn’t a problem. The large safety study specifically checked sodium levels in participants and found no disturbances. However, if you’re on a low-salt diet due to high blood pressure or other concerns, the sodium content is something to factor into your overall intake. The product labeling notes it should be considered “high in sodium” for people advised to limit salt.
Possible Side Effects
Side effects from Gaviscon are rare. Some people experience nausea, constipation, or diarrhea from certain formulations. Since constipation is already common during pregnancy, it’s worth noting if your symptoms change after starting Gaviscon, but most women tolerate it well.
The product also contains calcium carbonate, and official guidance recommends keeping the treatment duration as short as practical because of this. Using it regularly for a few weeks is fine based on the available evidence, but it’s not intended as a months-long daily medication if you can manage symptoms other ways.
Timing Around Prenatal Vitamins
This is the detail most pregnant women miss. Gaviscon can interfere with how your body absorbs other medications, particularly iron supplements. Since most prenatal vitamins contain iron, you need to separate them: don’t take Gaviscon within two hours before or after taking your iron tablets or prenatal vitamins. If you take your prenatal in the morning, schedule your Gaviscon for later in the day, or vice versa.
Lifestyle Changes to Try First
Gaviscon works best as a backup when basic adjustments aren’t cutting it on their own. Eating smaller, more frequent meals reduces the volume of food pressing against that relaxed valve. Avoiding spicy, fatty, or acidic foods helps some women significantly. Propping the head of your bed up by a few inches (using blocks under the legs rather than extra pillows, which can strain your neck) lets gravity work in your favor overnight.
Staying upright for at least 30 minutes after eating and avoiding eating close to bedtime are two of the simplest changes that make a real difference. When these strategies fall short, reaching for Gaviscon is a well-supported next step.