If you are allergic or intolerant to lactose, do not take this medication and seek advice regarding alternative medications., Do not take If you are allergic to medicines containing other proton pump inhibitors, Do not take this medication if you are currently undergoing treatment for HIV, by taking medication containing nelfinavir, Do not take this medication if you are allergic to omeprazole., Do not take this medication if it is someone else's medication., If you experience any of the following symptoms while using lansoprazole you are recommended to call your doctor or 99 right away:, Joint pain along with a red skin rash, especially in parts of your body exposed to the sun, such as your arms, cheeks and nose (this may be less noticeable on brown or black skin) – these can be signs of a rare condition called subacute cutaneous lupus erythematosus., This can happen even if you've been taking lansoprazole for a long time, stomach pain that seems to be getting worse – this can be a sign of an inflamed liver or pancreas, severe or persistent diarrhoea – this can be a sign of an inflamed bowel, you get a skin rash that may include itchy, red, swollen, blistered or peeling skin, you're wheezing, you get tightness in the chest or throat, you have trouble breathing or talking, your mouth, face, lips, tongue or throat start swelling, Taking lansoprazole for more than a year may increase your chances of certain side effects, including:, o bone fractures.
o gut infections.
o vitamin B12 deficiency – symptoms include feeling very tired, a sore and red tongue, mouth ulcers and pins and needles.