The NHS has shared important guidance on its website for anyone prescribed lansoprazole, especially those taking it for three months or longer. The health service’s site provides trusted, evidence-based advice on many medications and health conditions, helping patients make informed decisions about their treatment.What Is Lansoprazole And How Is It Used?Lansoprazole is a commonly prescribed medicine in the UK, belonging to a group called proton pump inhibitors (PPIs). PPIs make up a large portion of prescriptions dispensed in England. Lansoprazole works by reducing the amount of acid in the stomach and is used to treat and prevent various acid-related conditions, as per NHS.There are four other PPIs similar to lansoprazole: omeprazole, esomeprazole, pantoprazole, and rabeprazole. These medicines lower stomach acid in the same way and generally have similar effects and side effects. Doctors may prescribe a different PPI if lansoprazole is not working as expected or if side effects occur.People taking lansoprazole often notice improvements in two to three days, though it may take up to four weeks for full effect, so some symptoms can continue during this period.How Long Should Lansoprazole Be Taken?The duration of lansoprazole treatment depends on the condition being treated. It is usually advised to take the lowest effective dose for the shortest period to prevent long-term side effects. Some people take lansoprazole for extended periods, sometimes even years, but it should always be under regular supervision by a doctor because of potential risks.Lansoprazole: What Is The NHS Warning About?The NHS notes that taking lansoprazole for more than three months can reduce magnesium levels in the blood. Low magnesium may cause fatigue, confusion, dizziness, muscle twitches, shakiness, and irregular heartbeats. Anyone experiencing these symptoms should consult their doctor.Magnesium is vital for over 300 functions in the body, including nerve and muscle activity (including the heart), bone health, energy production, blood sugar regulation, and blood pressure control. Low magnesium can lead to muscle cramps, tiredness, irregular heart rhythms, and long-term problems like high blood pressure, type 2 diabetes, and weakened bones. It also affects cellular functions and the body’s electrolyte balance.Using lansoprazole for more than a year may raise the risk of side effects such as bone fractures, gut infections, and vitamin B12 deficiency. Symptoms of B12 deficiency include extreme fatigue, a sore or red tongue, mouth ulcers, and pins-and-needles sensations. Anyone noticing these signs or taking lansoprazole for extended periods should schedule regular check-ups.The NHS advises: “If you take lansoprazole for more than a year, your doctor will monitor your health to determine whether you should continue treatment. It is unclear if lansoprazole becomes less effective over time. If you feel it is no longer helping, speak to your doctor.”Lansoprazole: Medication Interactions to KnowPatients should inform their doctor of all other medications, vitamins, or supplements they are taking. Lansoprazole can interact with drugs like warfarin, digoxin, and certain HIV medications. Antacids such as Gaviscon should not be taken within two hours of lansoprazole. Herbal remedies like St John’s wort should also be avoided while on this medication.Seek urgent medical attention or call emergency services if you experience severe symptoms, including allergic reactions (swelling of the face or throat, difficulty breathing), worsening stomach pain, severe or persistent diarrhoea, or signs of low magnesium, such as muscle spasms, irregular heartbeat, or confusion.Does Long-Term Lansoprazole Use Increase Stomach Cancer Risk?The NHS notes that there is some evidence suggesting a very small increased risk of stomach cancer for people taking acid-reducing medicines, including PPIs like lansoprazole and H2 blockers, especially for more than three years. However, larger studies are needed to confirm a direct link.PPIs, like any medicine, can have side effects, so it is recommended to use them for the shortest effective period. Anyone noticing potential signs of stomach cancer—difficulty swallowing, vomiting, feeling full quickly, or unexplained weight loss—should speak to their doctor or pharmacist promptly.Disclaimer: This article is for informational purposes only and does not replace professional medical advice. Always consult your doctor, pharmacist, or other qualified healthcare provider regarding any questions about medications, side effects, or health conditions. Do not stop or adjust your prescribed treatment without medical guidance.