Effective for controlling diarrhoea, but there are situations where taking it is the wrong move.
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Loperamide slows the muscular contractions that move material through your bowel. Contents spend longer in the gut, more water is reabsorbed, and stools become firmer and less frequent.
It is an opioid chemically, but it does not cross into the brain at normal doses, so it has no painkilling effect and is not addictive when used as directed.
It controls the symptom. It does not treat the cause — which is exactly why the question of when to use it matters more than how.
For ordinary infectious gastroenteritis, fluid replacement matters far more than stopping the diarrhoea. Rehydration is the treatment; loperamide is convenience.
The dose is titrated to effect and can be taken before a known trigger — a journey, a meeting — rather than only after symptoms start. Many people find a small regular dose works better than a large reactive one.
Fluids are the actual treatment in infectious diarrhoea. Oral rehydration sachets replace salts as well as water, which plain water does not.
Do not exceed the stated dose. Higher doses do not work better and carry a specific cardiac risk described below.
At high doses loperamide causes dangerous heart rhythm disturbances, including QT prolongation and cardiac arrest. This is well documented, has caused deaths, and is the reason pack sizes are limited.
Never exceed the stated dose, and never use it to try to produce opioid effects. That misuse is what the cardiac warnings exist for.
Caution in pregnancy, in liver impairment, and in anyone with a heart rhythm disorder or on medicines that prolong the QT interval.
No routine monitoring for short-term use.
Long-term use for chronic diarrhoea should be reviewed, and the underlying cause established rather than assumed — persistent diarrhoea is not a diagnosis.
Yes, though it is cheap over the counter and rarely needs a prescription.
The more valuable part of a consultation is deciding whether you should be taking it at all — because in some situations it is the wrong medicine, and that judgement is not something a pharmacy shelf makes for you.
Where a consultation genuinely helps:
What we will not do is supply it to suppress diarrhoea that needs investigating. A prescription is never guaranteed. This page is information, not an offer to supply.
Loperamide is inexpensive over the counter, and own-brand capsules are identical to Imodium at a fraction of the price. Pack sizes are deliberately limited because of the cardiac risk at high doses.
Oral rehydration sachets are the thing actually worth buying alongside it, and they cost very little.
NHS prescriptions are free in Wales.
Stop as soon as stools are formed. Continuing past that point causes constipation and cramping, and people frequently swing between the two.
If there is blood in the stool, or a high fever. Those suggest an invasive infection, and slowing the bowel keeps the organism there longer. Rehydrate and get assessed instead.
Not under 12. Rehydration salts are the treatment in children, and loperamide carries real risks in young children.
In ordinary viral gastroenteritis, not meaningfully. In bacterial dysentery it can. That distinction is why fever and blood matter so much.
Not at normal doses — it does not reach the brain. At very high doses it has been misused, and that is genuinely dangerous, causing fatal heart rhythm problems. Never exceed the stated dose.
Regular use in IBS is legitimate, but it should be part of a reviewed plan rather than something you drift into. Persistent diarrhoea needs a diagnosis first.
Oral rehydration sachets, not sports drinks or flat cola. The salt-to-sugar ratio in rehydration salts is what makes them work; soft drinks can make diarrhoea worse.
Clinically reviewed by Dr Mohammad Zubair Khan, GMC 7563469
Last reviewed
September 8, 2026
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