Red cordial for Bali belly: does it work, and what actually helps

Where the remedy comes from

We could not establish it, and we are not going to invent an origin story to fill the gap. What is clear is that it circulates: it turns up in Bali group chats, in forum threads and in advice passed between travellers, usually as something a friend swears by.

It sits in a broader and much older Australian family of home remedies for gastro that lean on soft drinks and cordials, flat lemonade being the classic. Those remedies are genuinely well meant. They are trying to solve the right problem, which is getting fluid into someone who does not want to drink. They just reach for the wrong bottle.

What the Australian health services actually say

This is as unambiguous as public health advice gets. healthdirect, on managing gastroenteritis:

Make sure you drink enough fluids so you don't get dehydrated. Sip clear fluids every 5 to 10 minutes. Try not to drink sugary drinks because they can make diarrhoea worse.

Note the two halves. Sip clear fluids every 5 to 10 minutes is the technique, and it matters as much as the drink: small and frequent stays down where a big glass comes straight back. Try not to drink sugary drinks because they can make diarrhoea worse is the verdict on cordial, soft drink and juice.

And for anyone about to reach for a Gatorade instead, healthdirect closes that door too:

Sports rehydration drinks are not recommended.

Sports drinks are formulated for sweat losses during exercise, not for the fluid and salt losses of diarrhoea. Different problem, different formulation.

Why sugar is the wrong lever

A simplified version of the mechanism, because it makes the advice easier to remember. Your small intestine moves water in and out based partly on the concentration of what is sitting in it. A drink that is heavily loaded with sugar and carries almost no salt can draw water into the bowel rather than into you, which is the opposite of what you are trying to achieve.

Oral rehydration solution is built to avoid exactly that. It has a deliberate balance of glucose and salts, because a small amount of glucose actually helps the gut absorb sodium and water together. The sugar in ORS is there to carry the salt, not to sweeten it. Cordial has the sugar and none of the reason for it.

This is also why the advice is not simply drink lots of water either.

For older people and children, oral rehydration solutions are better than plain water. They contain the right concentration of salts to replace both fluids and electrolytes.

What to drink instead, in Bali and at home

• Oral rehydration sachets, first choice. Sold in any Indonesian apotek and any Australian pharmacy, pennies each, and they take up no room in a bag. They are on the Bali medical kit list for this reason.
• Mix with water you trust. Sealed bottled or properly boiled. Mixing a rehydration sachet with tap water in Bali defeats the entire exercise.
• Sip, do not gulp. healthdirect's every 5 to 10 minutes is the instruction. Small sips stay down when a full glass will not.
• Plain water alongside is fine, it is simply not sufficient on its own for the salt losses.
• Skip alcohol and caffeine. healthdirect advises avoiding both while you have diarrhoea. A beer by the pool on day two genuinely sets you back.
• Skip artificial sweeteners too, which healthdirect also lists as something to avoid.

Coconut water gets recommended constantly in Bali and is a pleasant drink, but it is not a substitute for a formulated rehydration solution and no Australian health service lists it as one. Have it because you like it, not as treatment.

With children, where this matters most

The cordial remedy is aimed most often at children, because a sick child will drink something sweet and refuse everything else. That instinct is understandable and it is also where the advice has the most potential to do harm, since children dehydrate faster than adults and have less margin.

Rehydration solution comes in versions designed for children, including icy pole formats that go down far more easily than a cup. Ask a pharmacist. healthdirect is also explicit that anti-diarrhoeal medicines should not be used to treat diarrhoea in children, so fluid really is the whole home plan.

Watch for fewer wet nappies or much less urine, no tears when crying, a dry mouth, unusual drowsiness, or a sunken soft spot in a baby, and get a doctor rather than persevering. Bali with kids covers the rest of the travelling-with-children picture.

The other remedies that go around

None of this is a reason to be precious about it. Most Bali belly ends on its own within a few days. The point of getting the fluid right is simply that dehydration is the complication that turns a ruined couple of days into a clinic visit.