Many people taking it for 10 or 15 years without really knowing why
Omeprazole is one of the UK's most prescribed drugs with 73 million NHS prescriptions in 2022-23, but many people use it preventively without medical supervision. Prolonged unnecessary use can impair absorption of calcium, magnesium, iron, and B12, increasing risks of osteoporosis, anaemia, digestive infections, and bacterial overgrowth.
- 73 million NHS prescriptions for all proton pump inhibitors in England during 2022-23, with omeprazole among the two most frequently prescribed
- Long-term unnecessary use impairs absorption of calcium, magnesium, iron, and vitamin B12, increasing risks of osteoporosis, anaemia, and digestive infections
- NHS recommends not taking over-the-counter omeprazole for longer than two weeks without medical consultation
- Stopping omeprazole after prolonged use can trigger rebound acid hypersecretion, temporarily worsening heartburn symptoms
A family doctor warns that long-term use of omeprazole, a widely prescribed acid reflux medication, without clear medical justification can cause serious nutritional deficiencies and health complications including osteoporosis and anaemia.
Omeprazole sits in millions of British medicine cabinets, a small tablet that promises relief from heartburn and acid reflux. It is one of the two most frequently prescribed drugs in the UK, with 73 million NHS prescriptions dispensed in 2022-23 alone. The medication works as a proton pump inhibitor, reducing stomach acid production, and for many people it is genuinely necessary—a lifeline for those managing reflux disease, ulcers, or the side effects of other medications. But Dr Ana Pérez Ballesta, a family doctor with a master's degree in Emergency Medicine, has begun to see a troubling pattern in her practice: patients taking omeprazole for a decade or more without any clear medical reason.
The problem, she explains, is that omeprazole has drifted far from its intended use. What was designed as a targeted treatment for specific conditions has become, in the hands of many patients, a casual preventative—a stomach protector taken before heavy meals, before alcohol, or whenever someone is prescribed an antibiotic or anti-inflammatory drug. The concept of a "stomach protector" sounds reasonable enough, but it is, in Dr Ballesta's view, a misunderstanding. Omeprazole and its chemical cousins—esomeprazole, pantoprazole, lansoprazole, and rabeprazole—are indicated for reflux, esophagitis, gastric or duodenal ulcers, and specific high-risk situations. They are not meant to be taken "just in case."
When taken unnecessarily over years, the consequences accumulate quietly. The medication interferes with the body's ability to absorb calcium, magnesium, iron, and vitamin B12. Over time, this can lead to osteoporosis, anaemia that resists standard treatment, and digestive infections. Dr Ballesta has documented patients in her own practice who developed small intestinal bacterial overgrowth, a condition known as SIBO, after prolonged omeprazole use. Some have suffered fractures from falls that would not have broken healthy bones. Others have developed anaemia that no amount of iron supplementation seems to correct. In the most severe cases, long-term use has been linked to Clostridioides difficile, a serious bacterial infection that causes severe diarrhoea and can be life-threatening.
The research on these risks exists, though it comes with an important caveat: most studies are observational, meaning they can show a relationship between the drug and these complications without definitively proving the medication caused them. Still, the pattern is consistent enough that the NHS itself recommends not taking over-the-counter omeprazole for longer than two weeks without consulting a doctor. For those prescribed the medication, the decision to continue should be made in conversation with a healthcare provider, weighing the genuine benefits against the individual's specific health risks.
There is another complication for those who have taken omeprazole for months or years and want to stop: the rebound effect. When the medication is suddenly discontinued, the stomach begins producing excess acid to compensate for the years of suppression. The resulting heartburn and reflux can be worse than the original symptoms, creating a temporary but intense withdrawal effect. This rebound typically fades within days or weeks, and the symptoms can be managed, but it is real enough that stopping the drug requires care and often medical guidance.
Dr Ballesta's warning is not that omeprazole is a dangerous drug—it is not, when used as intended. Rather, it is that the casual, indefinite use of a powerful medication without clear justification is a form of self-medication that can exact a hidden cost. She has seen too many patients who began taking omeprazole for a temporary problem, forgot why they started, and continued for years. Some are now dealing with bone loss, nutritional deficiencies, and digestive problems that might have been prevented. The medication is useful and effective when properly prescribed, she emphasizes, but it should not become a permanent fixture in the medicine cabinet simply because it is available and seems harmless. The question patients should ask themselves is simple: do I actually need this, or have I simply gotten used to taking it?
Notable Quotes
If you take it unnecessarily, it can hinder the absorption of calcium, magnesium, and vitamin B12. If you take it for years without needing it, it can increase the risk of osteoporosis, anaemia, and digestive infections.— Dr Ana Pérez Ballesta, family doctor with a master's degree in Emergency Medicine
Prolonged self-medication with this type of inhibitor can lead to complications that far outweigh the supposed benefits of taking it just in case.— Dr Ana Pérez Ballesta
The Hearth Conversation Another angle on the story
Why does a medication that's so widely prescribed suddenly become a problem when people take it long-term?
Because it was designed to solve a specific problem—acid reflux, ulcers, that sort of thing—not to be a permanent preventative. The issue is that once people start taking it, they often don't stop, even when the original reason is gone.
But it's available over the counter. Doesn't that suggest it's safe for regular use?
Over-the-counter availability doesn't mean it's meant for years of continuous use. The NHS itself says don't take it longer than two weeks without seeing a doctor. The safety profile changes dramatically when you're talking about a decade of use.
What's actually happening inside the body when someone takes it for that long?
The drug suppresses stomach acid, which is necessary for absorbing certain nutrients. Take it for years and you start running low on calcium, magnesium, iron, B12. Your bones weaken. You develop anaemia. Your gut bacteria can go haywire.
So it's not that the drug itself is toxic—it's that it prevents the body from doing something it needs to do?
Exactly. It's a useful intervention for the right problem. But as a permanent solution to a problem that may not even exist anymore, it becomes counterproductive.
What happens if someone realizes they've been taking it unnecessarily and wants to stop?
They hit a wall called rebound acid hypersecretion. The stomach floods with acid to compensate. The heartburn comes back worse than before. It's temporary, but it's real, and it's why people need guidance when they stop.
So the real issue is that people don't know why they're taking it anymore?
That's part of it. Dr Ballesta has seen patients who've been on it for 10, 15 years and can't remember why they started. By then, some damage is already done.