Gaviscon Advance Aniseed 500ml – Fast Heartburn & Acid Reflux Relief
Gaviscon Advance Aniseed 500ml is a pharmacy-strength liquid that gives fast, long-lasting relief from heartburn, acid reflux, and indigestion. Unlike ordinary antacids that neutralise acid, it forms a unique protective raft on top of the stomach contents. This raft physically blocks acid from rising into the food pipe, giving relief that lasts up to twice as long as regular treatments.
It is especially effective for symptoms triggered by spicy or fatty foods, coffee, alcohol, pregnancy, hiatus hernia or reflux oesophagitis. The pleasant aniseed flavour makes it easy and enjoyable to take.
How Does Gaviscon Advance Aniseed 500ml Work?
It contains twice the concentration of sodium alginate as Gaviscon Original. When mixed with stomach acid, sodium alginate and potassium hydrogen carbonate react to form a thick gel-like raft that floats on the stomach contents. This raft stops acid reflux while calcium carbonate helps it form quickly and adds a soothing effect.
What Symptoms Does It Relieve?
Gaviscon Advance Aniseed 500ml is designed to ease:
- Heartburn and burning in the chest
- Acid reflux and sour taste in the mouth
- Indigestion after meals
- Reflux oesophagitis and symptoms of hiatus hernia
- Hoarseness, cough or sore throat caused by reflux
Key Benefits
- Starts working within minutes
- Relief lasts up to 4 hours
- Twice as concentrated as Gaviscon Original
- Sugar-free with pleasant aniseed flavour
- Suitable for adults and children over 12
- Can be used during pregnancy and breastfeeding*
Directions for Use
Shake well before use. Adults and children 12+: Take 5–10 ml (one or two 5 ml spoonfuls) after meals and at bedtime. Do not exceed 40 ml in 24 hours.
Ingredients
Each 10 ml contains 1000 mg sodium alginate and 200 mg potassium hydrogen carbonate. Also contains calcium carbonate, carbomer, methyl and propyl parahydroxybenzoates, benzyl alcohol, sodium saccharin, sodium hydroxide, aniseed flavour, and purified water. Each 10 ml contains 4.6 mmol sodium.
FAQ – Gaviscon Advance Aniseed 500ml
How quickly does it work?
Most people feel relief within 3–5 minutes.
Can I take it when pregnant or breastfeeding?
Please check with your doctor or pharmacist first.
Is it sugar-free?
Yes – completely sugar-free and sweetened with saccharin.
How does it compare to Gaviscon Original?
It has double the concentration of the active ingredient, so it works faster and lasts longer.
Any side effects?
Side effects are rare. Possible allergic reactions include rash, itching, swelling, or breathing difficulties. Stop use and seek medical advice if these occur.
When Should I See a Doctor?
See your doctor if symptoms persist after 7 days, or if you have difficulty swallowing, unexplained weight loss, persistent vomiting, or blood in vomit/stools.
Warnings & Precautions
Do not use if allergic to any ingredients. Each 10 ml contains 4.6 mmol sodium – consult your doctor if on a low-sodium diet. Always read the patient information leaflet before use.
Always read the label and patient information leaflet before use. This is a Pharmacy Medicine (P).


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