Stop treatment for at least 5 days before chromogranin A measurements. Blood dyscrasias (thrombocytopaenia & neutropaenia). Hepatic enzyme abnormalities. Severe hypomagnesaemia. Sub-acute cutaneous lupus erythematosus. Patients on long-term treatment particularly those treated for >1 yr; at risk of osteoporosis; w/ reduced body stores or risk factors for reduced vit B
12 absorption on long-term therapy. Increased risk of GI infections eg,
Salmonella,
Campylobacter &
Clostridium difficile. May reduce vit B
12 absorption. Exclude gastric or esophageal malignancy prior to commencing treatment. Consider measuring Mg levels prior to & periodically during treatment in patients expected to be on prolonged treatment or taking digoxin or medicinal products causing hypomagnesaemia (eg, diuretics); temporary w/drawal in high-dose MTX administration; stopping treatment if lesions occur, especially in sun-exposed areas of skin, & if accompanied by arthralgia. Risk of cross-hypersensitivity reactions w/ other PPIs or substituted benzimidazoles. Not recommended to be co-administered w/ atazanavir. May impair ability to drive or operate machinery. Severe hepatic dysfunction. Not recommended in childn.