Do not take this medicine with any of the following medications:
-atazanavir
-nelfinavir

This medicine may also interact with the following medications:
-ampicillin
-delavirdine
-erlotinib
-iron salts
-medicines for fungal infections like ketoconazole, itraconazole and voriconazole
-methotrexate
-mycophenolate mofetil
-warfarin

They need to know if you have any of these conditions:
-liver disease
-low levels of magnesium in the blood
-lupus
-an unusual or allergic reaction to omeprazole, lansoprazole, pantoprazole, rabeprazole, other medicines, foods, dyes, or preservatives
-pregnant or trying to get pregnant
-breast-feeding

It can take several days before your stomach pain gets better. Check with your doctor or health care provider if your condition does not start to get better, or if it gets worse.

This medicine may cause serious skin reactions. They can happen weeks to months after starting the medicine. Contact your health care provider right away if you notice fevers or flu-like symptoms with a rash. The rash may be red or purple and then turn into blisters or peeling of the skin. Or, you might notice a red rash with swelling of the face, lips or lymph nodes in your neck or under your arms.

You may need blood work done while you are taking this medicine.

This medicine may cause a decrease in vitamin B12. You should make sure that you get enough vitamin B12 while you are taking this medicine. Discuss the foods you eat and the vitamins you take with your health care provider.

Keep out of the reach of children.

Store at room temperature between 15 and 30 degrees C (59 and 86 degrees F). Protect from light and moisture. Throw away any unused medicine after the expiration date.