Unexpected Facts About Omeprazole That Will Blow Your Mind
13. It Might Cause ‘Rebound Acid Hypersecretion’

Stopping omeprazole cold turkey can sometimes make acid reflux and heartburn worse than before. This phenomenon, known as rebound acid hypersecretion, occurs when the stomach suddenly ramps up acid production to compensate for the suppression caused by omeprazole. As a result, patients may experience severe heartburn, bloating, nausea, and indigestion—even if they never had significant symptoms before. This happens because omeprazole shuts down the stomach's proton pumps, and when the medication is stopped suddenly, these pumps become overactive, producing more acid than normal. Studies suggest that even after just four to eight weeks of use, the stomach may take several weeks to recalibrate and return to normal acid production. Doctors often recommend gradually tapering off PPIs rather than stopping abruptly. This might involve lowering the dose, switching to an H2 blocker, or using antacids as needed while the stomach adjusts. For long-term users, consulting a doctor before stopping omeprazole is always a wise approach.
14. It Could Affect Nutrient Absorption

One of the lesser-known effects of long-term omeprazole use is that it can interfere with the absorption of key vitamins and minerals, potentially leading to deficiencies. Stomach acid plays a crucial role in breaking down calcium, magnesium, iron, and vitamin B12, making them easier for the body to absorb. When acid levels are significantly reduced, these nutrients don’t get properly extracted from food, increasing the risk of deficiencies. Vitamin B12 deficiency is particularly concerning, as it can cause fatigue, nerve damage, memory problems, and even depression. Low magnesium levels can result in muscle cramps, irregular heart rhythms, and weakness, while poor calcium absorption may contribute to osteoporosis and a higher risk of fractures. For individuals taking omeprazole long-term, regular blood tests to monitor nutrient levels are a good precaution. Doctors may also recommend supplements or dietary changes to compensate for the reduced absorption.