Prodium contains loperamide hydrochloride 2 mg, an antidiarrhoeal that slows the movement of the bowel. It relieves acute diarrhoea, including travellers’ diarrhoea. It should not be used where there is blood in the stool or a high fever, and rehydration matters more than stopping the stools.
What is Prodium?
Prodium contains loperamide hydrochloride 2 mg, also sold as Adco-Prodium, Imodium and Lopedium.
Loperamide is chemically an opioid, and it acts on opioid receptors in the gut wall — but it barely enters the bloodstream or reaches the brain at normal amounts. That separation is the whole design: it produces the gut effect of an opioid, slowing intestinal movement, without pain relief, sedation or the effects associated with opioids elsewhere in the body.
Slowing the bowel gives the intestine more time to absorb water and salts from its contents. Stools become firmer and less frequent, and urgency settles.
This is a different approach from an adsorbent such as the attapulgite in Kantrexil, which binds water and toxins mechanically. Loperamide acts on the bowel’s motility instead, and it is more effective — which is exactly why it needs more care about when it should not be used.
What is Prodium commonly used for?
Loperamide is used for:
- Acute diarrhoea in adults, including from mild food-related upsets.
- Travellers’ diarrhoea, where it reduces urgency and frequency.
- Chronic diarrhoea in specific diagnosed conditions, such as some inflammatory bowel disease or short bowel syndrome, under medical supervision.
- Reducing output from an ileostomy, on medical advice.
Two limits are worth stating plainly.
It relieves the symptom, not the cause. Most acute diarrhoea in a healthy adult is viral and self-limiting, resolving in a day or two regardless. Loperamide makes those days manageable.
Rehydration is what actually matters. The danger in diarrhoea is loss of fluid and electrolytes, not the number of trips to the toilet. Oral rehydration solution — available from any pharmacy — replaces water and the salts lost together, which plain water does not. Buy it alongside, and use it. That advice applies whether or not you take loperamide, and it matters far more.
There is also a use it is not for. Loperamide should not be used to manage diarrhoea that is the body clearing an infection — which brings us to the cautions below.
How Prodium fits into this medicine category
| Group | Examples | How it works |
|---|---|---|
| Motility-slowing antidiarrhoeals | Loperamide (Prodium, Imodium) | Slows bowel movement |
| Adsorbents | Attapulgite (Kantrexil), kaolin | Binds water and toxins in the gut |
| Oral rehydration | ORS sachets | Replaces fluid and electrolytes |
| Antispasmodics | Hyoscine butylbromide (Hyospasmol) | Relieves cramping |
| Antiemetics | Metoclopramide (Adco-Contromet) | Reduces nausea and vomiting |
See the digestive, stomach and nausea medicines hub.
What to check before using Prodium
Do not take it if there is blood or mucus in the stool, or a high fever. This is the most important line on this page. Those signs point to an invasive bacterial infection — dysentery, some E. coli, Salmonella, Shigella, or C. difficile. Slowing the bowel in that situation holds the infection and its toxins inside for longer, and can lead to serious complications including toxic megacolon. See a doctor instead.
Never exceed the stated maximum. At very high amounts, far above any recommended level, loperamide does reach the heart and can cause dangerous, sometimes fatal, rhythm disturbances. This has become a recognised problem where the medicine is misused in large quantities, and it is why pack limits exist.
Speak to a pharmacist or doctor before using it if:
- The diarrhoea is for a child. Loperamide is generally not used in young children — rehydration is the treatment, and dehydration develops faster than in adults.
- There is severe abdominal pain, or abdominal swelling.
- You have ulcerative colitis or Crohn’s disease.
- You have recently taken antibiotics. Diarrhoea afterwards can be C. difficile infection, where loperamide is harmful.
- You have liver disease.
- You are pregnant or breastfeeding.
- The diarrhoea has lasted more than 48 hours, or keeps returning.
- You take medicines for heart rhythm, or anything known to affect the heart’s QT interval.
Buy oral rehydration solution at the same time.
Follow the pack instructions. This page does not set doses.
Possible cautions and when to ask a pharmacist or doctor
Stop when the diarrhoea stops. Continuing produces constipation, sometimes marked.
It is a short-term remedy. More than 48 hours of use without advice risks masking something that needs diagnosing.
For travellers’ diarrhoea, loperamide manages symptoms so you can travel, but it does not treat an infection. Fever, blood in the stool or severe illness means seek medical care rather than taking more.
Fluids beat tablets. Small, frequent sips of rehydration solution are better absorbed than large volumes, and better than plain water, which replaces the fluid but not the salts.
Common effects are constipation, abdominal cramps, dry mouth, dizziness and nausea.
Seek medical attention for signs of dehydration — marked thirst, little or no urine, dizziness on standing, dry mouth, sunken eyes, or in a child unusual drowsiness or a dry nappy for many hours; for blood or mucus in the stool; for black tarry stools; for a high fever; for severe abdominal pain or a swollen abdomen; for persistent vomiting preventing fluid intake; for palpitations or fainting; or for diarrhoea beyond 48 hours. Use a lower threshold for infants, older adults, pregnant women, and anyone with diabetes or a suppressed immune system.
Related medicine guides
- Browse Digestive, Stomach & Nausea Medicines guides
- Read: Hyospasmol used for
- Read: Adco Contromet used for
Frequently asked questions
What is Prodium used for? Acute diarrhoea in adults, including travellers’ diarrhoea. It contains loperamide, which slows the movement of the bowel.
Is it the same as Imodium? The active ingredient is the same — loperamide. The brand differs.
When should I not take it? If there is blood or mucus in the stool, a high fever, severe abdominal pain, or diarrhoea after a course of antibiotics. Those need medical assessment.
Does it treat the cause of diarrhoea? No. It relieves the symptom. Rehydration is what actually matters, and most acute diarrhoea resolves on its own.
Can I give it to my child? Generally not without medical advice. In children the treatment is oral rehydration solution, and dehydration develops faster than in adults.
How long can I take it? Short-term, and stop once stools are normal. Diarrhoea beyond 48 hours needs assessment.