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Causes and Treatment of Diarrhoea:

Acute diarrhoea is often caused by gastroenteritis due to either a viral or bacterial infection. Other causes may include food intolerances, stress or side effects from certain medications.1 Diarrhoea can be inconvenient and disruptive, making symptom relief important so that you can get back to your life with as little interruption as possible. 

Treat acute diarrhoea at the first sign of symptoms: Gastro-Stop is the #1 selling brand in Australia for diarrhoea relief2 with two effective solutions that can be tailored towards the sufferer's symptoms. 

Busy with life or travelling soon? Be prepared with Gastro-Stop and Gastro-Stop PLUS in case symptoms occur. 

How Gastro-Stop & Gastro-Stop PLUS Work:

Gastro-Stop provides effective relief from diarrhoea within one to three hours of consumption after the first dose.

Gastro-Stop PLUS relieves diarrhoea and also reduces abdominal discomfort and wind. It shortens the duration of diarrhoea by up to 75%.1

Gastro-Stop provides effective relief from diarrhoea within one to three hours of consumption after the first dose.

Gastro-Stop PLUS relieves diarrhoea and also reduces abdominal discomfort and wind. It shortens the duration of diarrhoea by up to 75%.1

Gastro-Stop: Australia’s #1 Selling Anti-Diarrhoeal Product2

Relief for diarrhoea

Gastro-Stop provides relief from acute diarrhoea and most people experience noticeable improvement within one to three hours after the first dose.

Effective relief for diarrhoea plus cramps, bloating and wind pain

Gastro-Stop PLUS provides relief from diarrhoea plus it relieves the gas-related abdominal discomfort that often accompanies diarrhoea, such as bloating, cramps and wind. 

Gastro-Stop: Australia’s #1 Selling Anti-Diarrhoeal Product2

Relief for diarrhoea

Gastro-Stop provides relief from acute diarrhoea and most people experience noticeable improvement within one to three hours after the first dose.

Effective relief for diarrhoea plus cramps, bloating and wind pain

Gastro-Stop PLUS provides relief from diarrhoea plus it relieves the gas-related abdominal discomfort that often accompanies diarrhoea, such as bloating, cramps and wind. 

ALWAYS READ THE LABEL AND FOLLOW THE DIRECTIONS FOR USE. 

1The combination of loperamide and simethicone significantly reduced the median time to last unformed stool by 75% (9.7 vs 39.0hours, p<0.001) compared with placebo during the 48-hour study period. Reference: Kaplan MA, Prior MJ, Ash RR, et al. Arch Fam Med 1999;8:243-8. Available from Aspen Pharmacare Australia Pty Ltd on request. Research conducted, analysed and supported by McNeil Consumer Healthcare, Fort Washington, Pa. 

2Circana (AU) Pty Ltd, AU Grocery and Pharmacy Scan: Anti-Diarrhoeals Anti-Motility segment in value and unit sales (Segment/brand list as defined by Aspen Mat 21/06/2026). 

Trademarks are owned by or licensed to Aspen Pharmacare Australia Pty Ltd. ©2026 Aspen Pharmacare Australia Pty Ltd or its licensors. All rights reserved. 

Offers valid at your selected TerryWhite Chemmart pharmacy, while stocks lasts. Not all items displayed in our catalogues will be available to purchase online or available from your selected pharmacy. ∞ Savings listed are calculated from suppliers' recommended retail price (RRP) at the time of preparation and not necessarily the previous in-store price. Due to our competitive pricing policy we may not have sold at RRP. The percentage savings shown are calculated to the nearest 5% of the actual savings. Prices are applicable for purchases made through the website or app only and may differ to instore prices. Not all products are available at all stores. Purchase limits may apply. In the event a product is listed at an incorrect price due to typographical error or error in pricing information received from our suppliers, we shall have the right to refuse or cancel any orders placed whether or not the order has been confirmed and your credit card charged. ^ Always read the label and follow the directions for use. Incorrect use could be harmful. Ask your pharmacist about this product. Fast delivery is available up to 5km from participating pharmacies, and excludes some regional areas, cold chain delivery and medicines that are not permitted to be delivered. Fast Delivery is not available within 2 hours of store closing time. TerryWhite Chemmart® is a registered trademark of TWC IP Pty Ltd ACN 136 833 611 and used under licence by TW&CM Pty Ltd ACN 136 833 620. The Opella & TerryWhite Chemmart - Win a Share of a Million Rewards Plus Points 2026 Promotion Terms and Conditions can be viewed here.