What is Xifaxan?

Rifaximin is used to treat traveler's diarrhea that is caused by a bacteria called Escherichia coli. It is also used to prevent hepatic encephalopathy, which is a condition that occurs when your liver does not work normally. This medicine is also used to treat irritable bowel syndrome with diarrhea. Rifaximin is an antibiotic that works by killing the bacteria and preventing its growth. However, this medicine will not work for colds, flu, or other virus infections.

This medicine is available only with your doctor's prescription.

Take this medicine exactly as directed by your doctor. Do not take more of it, do not take it more often, and do not take it for a longer time than your doctor ordered.

You may take this medicine with or without food.

To help clear up your infection completely, keep taking this medicine for the full time of treatment, even if you begin to feel better after a few days. If you stop taking this medicine too soon, your infection may return.

The dose of this medicine will be different for different patients. Follow your doctor's orders or the directions on the label. The following information includes only the average doses of this medicine. If your dose is different, do not change it unless your doctor tells you to do so.

The amount of medicine that you take depends on the strength of the medicine. Also, the number of doses you take each day, the time allowed between doses, and the length of time you take the medicine depend on the medical problem for which you are using the medicine.

• For oral dosage form (tablets):
  • For treatment of irritable bowel syndrome with diarrhea:
    • Adults—550 milligrams (mg) three times a day for 14 days.
    • Children—Use and dose must be determined by your doctor.
  • For treatment of traveler's diarrhea:
    • Adults and children 12 years of age and older—200 milligrams (mg) three times a day for 3 days.
    • Children younger than 12 years of age—Use and dose must be determined by your doctor.
  • For preventing hepatic encephalopathy:
    • Adults—550 milligrams (mg) two times a day.
    • Children—Use and dose must be determined by your doctor.

If you miss a dose of this medicine, take it as soon as possible. However, if it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Do not double doses.

Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light. Keep from freezing.

Keep out of the reach of children.

Do not keep outdated medicine or medicine no longer needed.

Ask your healthcare professional how you should dispose of any medicine you do not use.

In deciding to use a medicine, the risks of taking the medicine must be weighed against the good it will do. This is a decision you and your doctor will make. For this medicine, the following should be considered:

Tell your doctor if you have ever had any unusual or allergic reaction to this medicine or any other medicines. Also tell your health care professional if you have any other types of allergies, such as to foods, dyes, preservatives, or animals. For non-prescription products, read the label or package ingredients carefully.

Appropriate studies have not been performed on the relationship of age to the effects of rifaximin in children younger than 12 years of age with traveler's diarrhea, and in children with hepatic encephalopathy and irritable bowel syndrome with diarrhea. Safety and efficacy have not been established in these age groups.

Appropriate studies performed to date have not demonstrated geriatric-specific problems that would limit the usefulness of rifaximin in the elderly.

There are no adequate studies in women for determining infant risk when using this medication during breastfeeding. Weigh the potential benefits against the potential risks before taking this medication while breastfeeding.

Although certain medicines should not be used together at all, in other cases two different medicines may be used together even if an interaction might occur. In these cases, your doctor may want to change the dose, or other precautions may be necessary. When you are taking this medicine, it is especially important that your healthcare professional know if you are taking any of the medicines listed below. The following interactions have been selected on the basis of their potential significance and are not necessarily all-inclusive.

Using this medicine with any of the following medicines is usually not recommended, but may be required in some cases. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.

• Cholera Vaccine, Live

Certain medicines should not be used at or around the time of eating food or eating certain types of food since interactions may occur. Using alcohol or tobacco with certain medicines may also cause interactions to occur. Discuss with your healthcare professional the use of your medicine with food, alcohol, or tobacco.

The presence of other medical problems may affect the use of this medicine. Make sure you tell your doctor if you have any other medical problems, especially:

• Diarrhea and blood in the stool or
• Diarrhea and fever or
• Diarrhea caused by antibiotics or
• Diarrhea not caused by Escherichia coli—Should not be used in patients with these conditions.

• Liver disease, severe—Use with caution. The effects may be increased because of slower removal of the medicine from the body.

It is very important that your doctor check the progress of you or your child to see if the medicine is working properly. This will allow your doctor to decide if you or your child should continue to take it.

Check with your doctor right away if the diarrhea does not stop in 1 or 2 days or if you or your child develop a fever or have blood in your stool.

A person can become dehydrated if too much fluid is lost from the body with diarrhea. Make sure you or your child drink plenty of fluids while you have diarrhea. Check with your doctor right away if you or your child have more than one of the following symptoms: decreased urination, dizziness, dry mouth, increased thirst, or lightheadedness.

Do not take other medicines unless they have been discussed with your doctor. This includes prescription or nonprescription (over-the-counter [OTC]) medicines and herbal or vitamin supplements.