Ambrisentan - oral
Ambrisentan - oral
This medication must not be used during pregnancy because it can harm an unborn baby. See also Precautions section.
In the US, ambrisentan is only available to female patients enrolled in the Letairis Risk Evaluation and Mitigation Strategy (REMS) program. Male patients do not need to be enrolled in this program to receive this medication. Only doctors and pharmacies enrolled in this program may prescribe or provide ambrisentan. Consult your doctor or pharmacist for more details about this program and about the risks and benefits of using this medication.
These requirements apply in the US. If you live in Canada or any other country, consult your doctor and pharmacist for your country's regulations.
Ambrisentan is used to treat high blood pressure in the lungs (pulmonary arterial hypertension). This condition is thought to be caused by increased levels of a certain natural substance (endothelin-1). This medication blocks the effects of endothelin-1, thereby helping to decrease the blood pressure in the lungs, slow the worsening of symptoms, and improve your ability to exercise.
This drug is controlled through a special program. A program worker will call you each month to make sure that you have gotten a pregnancy test if you are a woman who may become pregnant. See also Warning and Precautions sections.
Read the Medication Guide provided by your pharmacist before you start using ambrisentan and each time you get a refill. If you have any questions, consult your doctor or pharmacist.
Take this medication by mouth with or without food, usually once daily or as directed by your doctor. Do not crush, chew, or break the tablets.
The dosage is based on your medical condition, response to treatment, and other medications you may be taking. Be sure to tell your doctor and pharmacist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products).
Use this medication regularly to get the most benefit from it. To help you remember, take it at the same times each day.
Do not stop taking this medication without consulting your doctor. Some conditions may become worse when the drug is suddenly stopped. Your dose may need to be gradually decreased.
Women who are pregnant or who may become pregnant should not handle the tablets or breathe the dust from this medication.
Tell your doctor if your condition persists or worsens.
Stuffy nose, runny nose, or flushing may occur. If any of these effects persist or worsen, tell your doctor or pharmacist promptly.
Tell your doctor right away if you have any serious side effects, including:
Other medications that are like ambrisentan may rarely cause very serious liver problems. Tell your doctor right away if you develop symptoms of liver disease, including:
This medication can decrease sperm production in some men, an effect that may lower male fertility. Consult 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:
In the US -
Before taking ambrisentan, tell your doctor or pharmacist if you are allergic to it; or to other endothelin receptor blockers (e.g., bosentan); 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:
Older adults may be at greater risk for swelling ankles/feet while using this drug.
This medication must not be used during pregnancy. It may harm an unborn baby. If you are planning pregnancy, become pregnant, or think you may be pregnant, tell your doctor right away. Women who may become pregnant must have a negative pregnancy test before starting this medication, once a month while taking it, and for 1 month after stopping the medication. Consult your doctor for more details and to discuss reliable forms of birth control. Unless otherwise directed by your doctor, it is recommended that at least 2 reliable forms of birth control (e.g., birth control pills, condoms) be used while taking this medication and for 1 month after stopping the medication. Birth control should still be used, even if your partner had a vasectomy.
It is not known whether this medication passes into breast milk. Because of the possible risk to the infant, breast-feeding while using this medication is not recommended. Consult your doctor before breast-feeding.
If someone has overdosed and has serious symptoms such as passing out or trouble breathing, call 911. Otherwise, call a poison control center right away. US residents can call their local poison control center at 1-800-222-1222. Canada residents can call a provincial poison control center. Symptoms of overdose may include: severe dizziness.
Do not share this medication with others.
Laboratory and/or medical tests (such as liver function test, monthly pregnancy test, hemoglobin level) will be performed periodically to monitor your progress or check for side effects. Consult your doctor for more details.
Information last revised June 2018.
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