Lansoprazole

• The usual dose of lansoprazole is 30 mg once a day.
• For some people, 15 mg once a day is enough.
• Your doctor will advise you how long to take lansoprazole for (usually for 4 to 8 weeks). Some people may need to take it for longer.
• It is best to take the lowest effective dose, for the shortest possible time.  
• The pharmacy label on your medicine will tell you how much lansoprazole to take, how often to take it and any special instructions.

• Take lansoprazole once a day in the morning on an empty stomach, 30 to 60 minutes before breakfast.
• Swallow the capsule whole with a glass of water. It won't work properly if crushed or chewed.
• If you forget to take your dose, take it as soon as you remember. But if it is nearly time for your next dose, just take the next dose at the right time. Don't take double the dose.

Here are some things to know when you're taking lansoprazole. Other things may be important as well, so ask your healthcare provider what you should know about.

Avoid long-term use of lansoprazole

If you don’t need it, lansoprazole should not be taken long term, because of the possible side effects. There may be a small increased risk of bone fractures, chest infections, gut infection and nutrient deficiencies such as low magnesium and vitamin B12. If you’ve been taking a PPI for reflux for longer than 4 to 8 weeks, and your symptoms seem to be well managed, it’s a good idea to talk to your healthcare provider about reviewing your medicine. They may recommend reducing your treatment. This could include:

• reducing your daily dose of lansoprazole
• taking lansoprazole only when you experience the symptoms of heartburn and reflux (also known as on-demand therapy)
• stopping treatment completely, as your symptoms may not return.

Read more about PPIs for heartburn and reflux.(external link)

Taking other medicines

Lansoprazole may be affected by medicines or herbal supplements, so check with your doctor or pharmacist before starting any new medicines. Don't take indigestion remedies (antacids) 2 hours before or after you take lansoprazole.

Having an endoscopy

Ask your doctor if you should stop taking lansoprazole a few weeks before your endoscopy. It may hide some of the problems that would usually be spotted during the procedure.

Rebound acid secretion when stopping

When lansoprazole is stopped, a common side effect is rebound acid secretion, where the acid secretion in your stomach increases significantly. This should return to normal within 2 weeks.

Because the symptoms of rebound acid secretion are the same as for reflux (such as indigestion, discomfort and pain in your upper stomach and chest, feeling sick and an acid taste in your mouth), it can form an ongoing loop where stopping lansoprazole treatment creates the need to start it again.

Rather than restarting lansoprazole, your doctor may advise you to use antacids such as Acidex, Mylanta or Gaviscon. These can be effective for treating rebound acid secretion so talk to your healthcare provider or pharmacist if you experience it.

If you’ve been taking lansoprazole long term, talk to your healthcare provider about whether they recommend you slowly reduce your dose before stopping.

Other side effects

Like all medicines lansoprazole can cause side effects, although not everyone gets them. If you're concerned about any symptoms you think might be related to your medicine, talk to your healthcare provider. The following information offers some guidance but doesn't include all possible side effects.

Common side effects

Tell your healthcare provider if these side effects bother you.

• Sore stomach or feeling sick (nausea). Try taking omeprazole with or after a meal or snack.
• Feeling bloated, gas in your abdomen (tummy), farting.
• Mild diarrhoea (runny poo).
• Constipation.
   

Tell your healthcare provider immediately or phone Healthline free on 0800 611 116 if these occur

• Signs of low magnesium, such as muscle cramps, weakness, tiredness, feeling irritable and tingling or numbness.
• Signs of low vitamin B12 such as feeling very tired, a sore and red tongue, mouth ulcers and pins and needles.
• Skin rashes with or without a fever and joint pain.
• Signs of an inflamed bowel such as severe or ongoing diarrhoea (loose, watery, frequent poo).

Phone 111 for an ambulance or go to your nearest accident and emergency (A&E) clinic if these occur

• Signs of an allergic reaction such as itchy skin, and rash, swollen lips or tongue, problems breathing, like a tight chest or shortness of breath.
   

Read more about medicines and side effects and reporting a reaction you think might be a side effect.