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Lansoprazole belongs to the class of medicines called proton pump inhibitors (PPI). PPIs were discovered in 1979 and lansoprazole has been used for over 30 years. PPIs are safe and effective treatments for acid reflux/heartburn, Gastro-oesophageal reflux disease (GORD) and dyspepsia/indigestion, and can also help a range of other gastric and duodenal conditions.

Further information: NHS - Lansoprazole.

How does lansoprazole relieve acid reflux/heartburn?

The 'proton pump' is the process which produces digestive acid in the stomach in response to eating a meal. Lansoprazole and other PPIs block the proton pump and so reduce the acidity in the stomach. As there is less acid the symptoms of acid reflux and heartburn are reduced.

How to take lansoprazole

• Starting dose is usually 15mg once a day, increasing to 30mg daily if necessary to fully control symptoms. (30mg can be made up from: One 30mg tablet or capsule in the morning; Two 15mg tablets or capsules together in the morning; Or one 15mg tablet or capsule twice a day, morning and evening).
• Use daily for up to 4 weeks.
• If symptoms do not settle after 2 weeks, consult a GP to discuss further investigation.
• If symptoms come back, take lansoprazole 15mg or 30mg, as above as needed.
• If needing to continue to use lansoprazole more than 4 times a week for over 4 weeks, consult a GP.

Zoton FasTabs and lansoprazole orodispersible tablets:

• Take one lansoprazole tablet once a day in the morning, half an hour before breakfast.
• Place the tablet on the tongue, where it should dissolve without needing a drink.
• Swallow the microgranules released without chewing.

Alternative methods:

• Swallow the tablet whole with a glass of water.
• Dissolve the tablet in a syringe of water before swallowing (see manufacturer's patient leaflet for detailed instructions).

Lansoprazole capsules:

• Swallow the capsule whole with a glass of water.
• Do not chew or crush the capsules.

How soon is lansoprazole effective?

Many people notice an improvement within a few hours. There should be a clear reduction in symptoms within a few days of starting lansoprazole. For best results follow the instructions carefully on how to take it - see above and read the patient leaflet supplied in packs.

Consult a GP if symptoms have not significantly settled after 2 weeks.

Who might be suitable for lansoprazole?

Dr Fox supplies lansoprazole 15mg and 30mg to treat dyspepsia and Gastro-oesophageal reflux disease (GORD), with symptoms of acid reflux, acid indigestion, and heartburn in adults over 18.

Lansoprazole can also be used:

• To prevent recurrence in healed oesophagitis.
• To prevent gastroduodenal ulcers due to taking continuous NSAID (non steroidal anti-inflammatory) treatment.
• For other conditions linked to overproduction of stomach acid.

Helicobacter pylori (H. pylori)

H. pylori is a bacterium found in some people's stomachs. It is known to be linked with gastritis, gastric and duodenal ulcers, and gastric cancer. All PPIs, including lansoprazole, can be used in combination with certain antibiotics, to clear H. pylori from the stomach. A GP will often test for H. pylori if symptoms of acid reflux, indigestion, and heartburn do not settle quickly with a PPI or there are home self tests available. The test is usually either a simple stool (poo) test or a breath test. For the test to be reliable, you must not have taken a PPI in the past 2 weeks, or antibiotics in the past 4 weeks.

Is there anyone who cannot take lansoprazole?

There are checks in the online consultation to confirm if lansoprazole is suitable or may affect other medications taken.

If taking phenytoin (for fits) or warfarin type anticoagulants (blood thinners requiring regular blood tests) speak to the GP about extra monitoring before taking lansoprazole.

If taking medication to treat HIV/AIDS or cancer chemotherapy, including methotrexate, do not take lansoprazole without discussing with your specialist as lansoprazole may interfere with your treatment.

Lansoprazole may not be suitable for people with severe liver or kidney problems - consult a GP.

During treatment with lansoprazole, if new symptoms develop such as unintended weight loss, vomiting, swallowing difficulties, blood in vomit, or dark and tarry stools, or new stomach pains you must seek urgent medical attention.

Inform the doctor or nurse if undergoing investigations or blood tests, that you are taking lansoprazole.

Are there any drugs which might interact with lansoprazole?

There are a few medicines which interact with lansoprazole, making one or other less or more effective. Checks for these are carried out in the online consultation.

Do not take lansoprazole if taking:

• Nelfinavir, rilpivirine, atazanavir, saquinavir and ritonavir, tipranivir, or similar - for HIV

Discuss with your GP/specialist before taking lansoprazole if taking:

• Dasatinib, gefitinib, neratinib, erlotinib - cancer chemotherapy.
• Digoxin - heart.
• Fluvoxamine for depression.
• Ketoconazole, posaconazole, voriconazole, and itraconazole - antifungals.
• Methotrexate - cancer chemotherapy, rheumatoid arthritis, and psoriasis.
• Phenytoin - fits.
• Rifampicin - tuberculosis.
• Tacrolimus - transplant rejection.
• Theophylline - asthma.
• St John's Wort - herbal remedy for low mood.
• Warfarin - blood thinning.

Pregnancy and/or breastfeeding

There is no information about the safety of lansoprazole in pregnancy or breastfeeding so lansoprazole should not be used, without first discussing with a GP or specialist.

Possible side effects of lansoprazole

All medications can cause side effects but not everyone gets them.

Side effects are more commonly reported with lansoprazole than other PPIs, and can include:

• Headache.
• Dizziness.
• Constipation or diarrhoea.
• Flatulence (wind).
• Nausea/vomiting.
• Stomach pains.
• Dry mouth.
• Small harmless stomach polyps (only seen on endoscopy and settle on stopping the medication).

Further information is in the manufacturer's patient leaflet.

Special warnings/precautions for use

If you are due to have a gastroscopy/endoscopy you will probably be asked to stop taking lansoprazole a few weeks before the procedure - check with your GP.

The following have been reported with long-term (over a year) regular use of PPIs including lansoprazole:

• Slight increase in the risk of fractures at the hip, wrist, and spine, hence patients are recommended to follow national guidelines for prevention and treatment of osteoporosis, and to have an adequate intake of calcium and vitamin D. Risk is increased if also taking regular steroid medication.
• Low levels of vitamin B12. If you already have low vitamin B12 levels, discuss with a GP before taking lansoprazole.
• Low magnesium levels. Symptoms include fatigue, dizziness, confusion, fits, and irregular heart rhythms. More likely if taken with other drugs (e.g. digoxin) which can also lower magnesium levels. Periodic checks of blood magnesium levels may be recommended if taking for longer than 3 months continuously.
• A rare condition 'subacute cutaneous lupus erythematosus' (SCLE). Consult your GP promptly if you develop a skin rash on sunlight exposed areas.
• A slightly higher risk of gastroenteritis such as Campylobacter and Salmonella.

Very rare effects:

• Dizziness, visual disturbances, and muscular weakness - if affected do not drive or operate heavy machinery.
• In some uncommon cases lansoprazole can lead to blood changes, so if having any blood test, always let your GP or nurse know that you are taking it.

Allergy to lansoprazole and other PPIs

Do not take lansoprazole if you are known to be allergic to other PPIs.

If you have any symptoms or signs suggestive of an acute allergic reaction (anaphylaxis), you must get medical help immediately (telephone 999 if in the UK).

Symptoms/signs of an acute allergic reaction include:

• Difficulty breathing, tight chest, wheezing.
• Swelling of the face, lips, or tongue.
• Skin rash – urticaria/hives.
• Confusion/collapse/unconsciousness.

For more information see NHS - Anaphylaxis.

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