If your cat has digestive problems (loose stools, vomiting, poor appetite, chronic gut upset) the safest and most effective options in Australia are veterinary therapeutic diets plus veterinary assessment. Below are commonly recommended products available in Australia and practical tips.

Veterinary prescription diets (commonly recommended)

• Royal Canin Veterinary Diet — Gastrointestinal (wet pouches and dry formulas). Formulated to be highly digestible with balanced fibres and prebiotics to support recovery from acute or chronic diarrhoea, IBD, gastritis, pancreatitis and similar conditions. (royalcanin.com)
• Hill’s Prescription Diet i/d (Digestive Care) — wet and dry versions; highly digestible, high electrolytes/B‑vitamins and ActivBiome+ prebiotic technology to support stool quality and the gut microbiome. Widely sold through Australian vet clinics and online authorised retailers. (VetsLovePets.com.au)
• Purina Pro Plan Veterinary Diets — EN Gastroenteric (for vomiting, diarrhoea, pancreatitis, malabsorption) and HA Hydrolyzed (for suspected food‑sensitivity related GI disease). These are formulated to reduce gut workload and support recovery; available via vets and Australian online vet suppliers. (Purina.com.au)

When each is appropriate

• EN/Gastrointestinal diets (Royal Canin Gastrointestinal, Purina EN, Hill’s i/d) are commonly used for acute gastroenteritis, recurrent vomiting/diarrhoea, pancreatitis recovery and malabsorption. (royalcanin.com)
• Hydrolysed or hypoallergenic diets (Purina HA or veterinary hydrolysed Hill’s/other brands) are used if a food allergy or sensitivity is suspected. (Purina.com.au)

Practical points (important)

• See your vet first. Digestive signs can be caused by many problems (infection, parasites, pancreatitis, IBD, organ disease) and some require tests or immediate treatment. Therapeutic diets are usually recommended under veterinary guidance. (general clinical standard; supported in product notes). (royalcanin.com)
• Transition gradually over ~7 days (or as your vet advises) unless the vet asks for immediate exclusive feeding. Monitor appetite, vomiting frequency and stool consistency. Product pages and vets advise gradual transition and follow‑up. (Purina.com.au)
• Use the diet for the time recommended by your vet (often at least 2–12 weeks for GI recovery; some chronic conditions need longer or lifetime feeding). (royalcanin.com)
• If food allergy is suspected, your vet may recommend an elimination trial with a hydrolysed or novel‑protein prescription diet. (shop.WestVETS.com.au)

Non‑prescription options

• Some over‑the‑counter “sensitive stomach” cat foods exist, but they are less controlled than vet diets and may not be suitable for moderate–severe or chronic problems. Always check with your vet before switching to non‑prescription options.

Where to buy in Australia

• Prescription diets are typically supplied by your veterinary clinic or authorised online veterinary suppliers / pharmacy shops in Australia (many of the product pages and Australian vet‑retailer listings show availability). Examples: Royal Canin Vet Products, Hill’s authorised Australian retailers, Purina Pro Plan Veterinary Diets through vet supply shops. (shop.portvet.com.au)

If you want, I can:

• Suggest which of the above might fit a particular symptom set (e.g., acute watery diarrhoea vs chronic small‑bowel diarrhoea vs suspected food allergy), or
• Find nearby Australian clinics/retailers that stock a specific prescription diet (tell me the product name and your city/postcode).

(If your cat is vomiting repeatedly, having bloody diarrhoea, dehydrated, lethargic, or not eating for >24 hours — seek veterinary attention urgently.)