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Bosentan

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Warning

Bosentan may rarely cause serious (possibly fatal) liver damage. Rarely, liver problems have happened in people after stopping treatment with bosentan. Your doctor will perform liver function tests before you start treatment and once a month during treatment. Tell your doctor right away if you notice nausea/vomiting that doesn't stop, dark urine, loss of appetite, stomach/abdominal pain, or yellowing eyes/skin.

Bosentan must not be used during pregnancy because it may cause serious harm (such as birth defects) in an unborn baby. Women of childbearing age must have a negative pregnancy test before starting this medication and monthly during treatment. Use at least two reliable forms of birth control while taking bosentan and for at least one month after stopping bosentan as directed by your doctor to prevent pregnancy. If you become pregnant or think you may be pregnant, tell your doctor right away. (See also Precautions section.)

To receive this medication in the United States, you must understand, agree to, and carefully follow the requirements of the Bosentan REMS Program. If you live in Canada or any other country, consult your doctor and pharmacist for your country's regulations.

Precautions

See also Warning section.

Before taking bosentan, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

Before using this medication, tell your doctor or pharmacist your medical history, especially of: liver disease, anemia.

This drug may make you dizzy. Alcohol or marijuana (cannabis) can make you more dizzy. Do not drive, use machinery, or do anything that needs alertness until you can do it safely. Avoid alcoholic beverages. Talk to your doctor if you are using marijuana (cannabis). Alcohol may also increase the risk of serious liver problems.

Before having surgery, tell your doctor or dentist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products).

This medication must not be used during pregnancy. It may harm an unborn baby. It is important to prevent pregnancy while using this medication. Discuss the use of at least two reliable forms of birth control (such as condoms, birth control pills) with your doctor. If you become pregnant or think you may be pregnant, tell your doctor right away.

This medication passes into breast milk. Consult your doctor before breastfeeding.

Side Effects

See also Warning section.

Dizziness, flushing, stuffy nose, or joint pain may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly.

Remember that this medication has been prescribed because your doctor has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.

Tell your doctor right away if you have any serious side effects, including: fast/pounding heartbeat, unusual tiredness, swelling ankles/feet, unusual/sudden weight gain, fainting, shortness of breath, coughing up blood.

In men, this medication can decrease sperm production, which may affect the ability to father a child. Talk to your doctor for more details.

A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: fever, swollen lymph nodes, rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.

This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.

In the US -

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at www.fda.gov/medwatch.

In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

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Information expires December 2024.