Drug information provided by: Micromedex

It is very important that your doctor check you or your child closely while you are receiving this medicine. This is to make sure that this medicine is working properly. Blood tests will be needed to check for unwanted effects.

If your or your child's symptoms do not improve within a few days or if they become worse, check with your doctor.

Using this medicine while you are pregnant can harm your unborn baby. Use an effective form of birth control to keep from getting pregnant. If you think you have become pregnant while using the medicine, tell your doctor right away.

You should not use any of the following medicines while you or your child are receiving this medicine:

  • Astemizole (Hismanal®) or
  • Carbamazepine (Tegretol®) or
  • Cisapride (Propulsid®) or
  • Efavirenz (Sustiva®) or
  • Ergot medicines (eg, dihydroergotamine, ergotamine, or Migranal®) or
  • Phenobarbital (Luminal®) or
  • Pimozide (Orap®) or
  • Quinidine (Quinora®) or
  • Rifabutin Mycobutin®) or
  • Rifampin (Rifadin®, Rimactane®) or
  • Ritonavir (Norvir®) or
  • Sirolimus (Rapamune®) or
  • St. John's wort or
  • Terfenadine (Seldane®).

Using any of them together with this medicine may increase the chance of unwanted effects.

This medicine may cause some people to have changes in vision, such as blurred vision and seeing bright spots or wavy lines. Make sure you know how you react to this medicine before you drive (especially at night), use machines, or do anything else that could be dangerous if you cannot see well.

Check with your doctor right away if you or your child have pain or tenderness in the upper stomach, pale stools, dark urine, loss of appetite, nausea, unusual tiredness or weakness, or yellow eyes or skin. These could be symptoms of a serious liver problem.

Contact your doctor right away if you or your child have any changes to your heart rhythm. You might feel dizzy or faint, or you might have a fast, pounding, or uneven heartbeat. Make sure your doctor knows if you or anyone in your family has ever had a heart rhythm problem such as QT prolongation.

This medicine may cause a serious type of allergic reaction called infusion reaction. This can be life-threatening and requires immediate medical attention. Tell your doctor or nurse right away if you or your child have a fever, chills, flushing, itching or skin rash, shortness of breath, sweating, trouble breathing, lightheadedness, fainting, or chest tightness within a few hours after you receive it.

This medicine may make your skin more sensitive to sunlight. Use a sunscreen when you are outdoors. Avoid sunlamps and tanning beds.

Serious skin reactions can occur during treatment with this medicine. Check with your doctor right away if you or your child have blistering, peeling, or loose skin, red skin lesions, severe acne or skin rash, sores or ulcers on the skin, or fever or chills while you are using this medicine.

This medicine may cause bone pain when used for a long period of time. Check with your doctor right away if you or your child have bone pain while using this medicine.

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.