Prevacid Precautions and Warnings

For people taking Prevacid, precautions and warnings include such things as being aware of potential interactions that can occur when the drug is taken with other medications. Other precautions and warnings for Prevacid users include using caution if nursing while taking the medication. People with severe liver disease may need to be treated with particular caution when taking Prevacid.

Prevacid Precautions and Warnings: What to Tell Your Healthcare Provider

Prior to taking Prevacid® (lansoprazole), you should let your healthcare provider know if you:
  • Have liver disease or liver failure
  • Have low blood magnesium (hypomagnesemia) 
  • Are pregnant or breastfeeding
  • Have any allergies.
It is also important to tell your healthcare provider about all of the medicines that you are taking, including prescription and nonprescription medicines, vitamins, and herbal supplements.

Some Prevacid Precautions and Warnings

Some precautions and warnings to be aware of with Prevacid include the following:
  • Studies indicate that people who take proton-pump inhibitor medications (such as Prevacid) may be at an increased risk for broken bones. The risk appears to be highest for people who take such medications at high doses or for long periods of time (over a year). You and your healthcare provider should take this into account when deciding if the benefits of this medication outweigh the risks for your particular situation.


  • The use of proton pump inhibitors (including this medication) may increase the risk of a potentially serious condition known as Clostridium difficile-associated diarrhea (CDAD). If you develop diarrhea that does not seem to improve (especially if it is watery and accompanied by a fever and abdominal pain), seek immediate medical attention. 


  • Prevacid is considered a pregnancy category B drug, which means that it has not been studied in pregnant women. However, when studied in animals, it showed no negative effects on unborn babies. If you are pregnant, discuss the safety of your baby with your healthcare provider before using Prevacid (see Is Prevacid Safe During Pregnancy? for more information).
  • If you have severe liver disease, your healthcare provider may use caution when treating you with Prevacid.


  • Proton pump inhibitors (PPIs), including Prevacid, may cause low blood magnesium levels (hypomagnesemia). Seek immediate medical attention if you develop any symptoms of hypomagnesemia, such as muscle spasms, an irregular heart rhythm (arrhythmia), or seizures. Your healthcare provider may want to check your magnesium levels periodically using a simple blood test. 
  • If you are nursing, Prevacid passes through your milk. Therefore, if you are breastfeeding, make sure to check with your healthcare provider before taking Prevacid (see Prevacid and Breastfeeding for more information).

Prevacid Medication

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