What is OPSUMIT? OPSUMIT® (macitentan) is a prescription medicine used to treat pulmonary arterial hypertension (PAH, WHO... Read more Group 1). PAH is high blood pressure in the arteries of your lungs. OPSUMIT can:

bullet imageImprove your ability to exercise as measured by the 6-minute walk distance (6MWD). In a clinical study of mainly WHO FC II-III patients, those taking OPSUMIT walked, on average, 22 meters farther at Month 6 than patients not taking it

bullet imageImprove some of your symptoms

bullet imageHelp slow down the progression of your disease. Disease progression included the need for injectable PAH medication or other worsening of PAH (decreased 6MWD, PAH symptoms getting worse, and the need for new PAH treatment)

bullet imageLower your chance of being hospitalized for PAH

It is not known if OPSUMIT is safe and effective in children. Read less

Getting Started on OPSUMIT

When you’re prescribed OPSUMIT® (macitentan), it’s important to understand the possible risks and benefits of this pulmonary arterial hypertension (PAH) treatment. The steps below explain your role and how you can get off to a good start.

Step 1: Your healthcare provider prescribes OPSUMIT

When you are prescribed OPSUMIT:

  • You and your healthcare provider will review the OPSUMIT Medication Guide and complete the OPSUMIT Patient Enrollment and Consent Form
  • If you are a female, you must enroll in the OPSUMIT Risk Evaluation and Mitigation Strategy (REMS) Program due to the risk of serious birth defects. You must agree to all instructions in the program
  • If you are a female who can get pregnant, you must also:
    • Review the OPSUMIT REMS Guide for Females Who Can Get Pregnant
    • Have a negative pregnancy test before starting OPSUMIT, each month while taking OPSUMIT, and for 1 month after you stop taking OPSUMIT
    • Use acceptable forms of birth control when taking OPSUMIT and for 1 month after stopping OPSUMIT. Acceptable birth control options are included in the OPSUMIT Medication Guide. Your healthcare provider will help you choose the types of birth control that are right for you

Step 2: Work with an Actelion Pathways Case Manager

Actelion provides a wide range of support and services through Actelion Pathways®. If you choose to enroll, your Actelion Pathways Case Manager will call you to:

  • Help answer your questions about filling your prescription
  • Coordinate with your healthcare provider, insurance company, and specialty pharmacy to help find out if you have coverage for your medicine
  • Inform you of possible financial assistance programs based on your eligibility

Contact Actelion Pathways

To learn more about the support and services offered by Actelion Pathways, call 1-866-ACTELION (1-866-228-3546)

Mon-Fri, 8 AM-8 PM ET

Step 3: Speak with your specialty pharmacy

OPSUMIT is not available at your local pharmacy and is only available through a specialty pharmacy, which will send your medicine to your home.

  • When OPSUMIT arrives at your home, take OPSUMIT as prescribed by your healthcare provider
  • A specialty pharmacy will call you each month to review your current medicines, discuss the OPSUMIT Medication Guide, and reorder OPSUMIT
    • Therapy can be shipped in as little as 24 hours after you confirm consent with an Actelion Pathways Case Manager and a specialty pharmacist
  • If you are a female who is able to get pregnant:
    • Take the monthly pregnancy test and use the types of birth control agreed upon with your healthcare provider. Do not get pregnant. Tell your healthcare provider right away if you have unprotected sex, think that your birth control has failed, miss a menstrual period, or think you are pregnant
    • Be ready to talk about your monthly pregnancy test results with your specialty pharmacy
    • The refill may not be done on time if you've not had your pregnancy test

Have Questions About Receiving OPSUMIT?

Please call 1-866-ACTELION
(1-866-228-3546)
. For questions about taking OPSUMIT, contact your healthcare provider.

Expect a Phone Call

You will receive a call from your specialty pharmacy each month with a caller ID of 1-855-417-7862. If you miss the call, it’s important to call back.

What is the most important information about OPSUMIT® (macitentan)?

OPSUMIT can cause serious birth defects if taken during pregnancy.

  • Females must not be pregnant when starting OPSUMIT or get pregnant while taking OPSUMIT
  • Females who are able to get pregnant must have a negative pregnancy test before starting OPSUMIT, each month while taking OPSUMIT, and for 1 month after stopping OPSUMIT. Talk to your healthcare provider about your menstrual cycle. Your healthcare provider will decide when to do the pregnancy tests
    • Females who are able to get pregnant are females who have entered puberty, even if they have not started their menstrual period, and have a uterus, and have not gone through menopause (menopause means that you have not had a menstrual period for at least 12 months for natural reasons, or that you have had your ovaries removed)
    • Females who are not able to get pregnant are females who have not yet entered puberty, or do not have a uterus, or have gone through menopause (menopause means that you have not had a menstrual period for at least 12 months for natural reasons, or that you have had your ovaries removed), or are infertile for other medical reasons and this infertility is permanent and cannot be reversed

Females who are able to get pregnant must use 2 acceptable forms of birth control during treatment with OPSUMIT and for 1 month after stopping OPSUMIT because the medicine may still be in the body. Females who have had a tubal sterilization, a progesterone implant, or have an IUD (intrauterine device) can use these methods alone without any other form of birth control.

  • Talk with your healthcare provider to find out about options for acceptable birth control that you may use to prevent pregnancy during treatment with OPSUMIT. See the OPSUMIT Medication Guide for acceptable birth control options
  • Do not have unprotected sex. Talk to your healthcare provider or pharmacist right away if you have unprotected sex or if you think your birth control has failed. Your healthcare provider may talk with you about using emergency birth control
  • Tell your healthcare provider right away if you miss a menstrual period or think you may be pregnant

If you are the parent or caregiver of a female child who started taking OPSUMIT before reaching puberty, you should check your child regularly to see if she is developing signs of puberty. Your child may reach puberty before having her first menstrual period. Talk to your healthcare provider if you think your child is developing signs of puberty or if you have any questions about the signs of puberty.

Females can only receive OPSUMIT through a restricted program called the OPSUMIT Risk Evaluation and Mitigation Strategy (REMS) Program. If you are a female who can get pregnant, you must talk to your healthcare provider, understand the benefits and risks of OPSUMIT, and agree to all of the instructions in the OPSUMIT REMS Program.

Males can receive OPSUMIT without taking part in the OPSUMIT REMS Program.

Who should not take OPSUMIT?

Do not take OPSUMIT if you are pregnant, plan to become pregnant, or become pregnant during treatment with OPSUMIT. OPSUMIT can cause serious birth defects. See "What is the most important information about OPSUMIT?"

Tell your healthcare provider about all your medical conditions and all the medicines you take, including prescription and nonprescription medicines, vitamins, and herbal supplements. OPSUMIT and other medicines may affect each other causing side effects. Do not start any new medicine until you check with your healthcare provider. Especially tell your healthcare provider if you take an HIV medicine.

What should I avoid while taking OPSUMIT?

  • Do not get pregnant. OPSUMIT can cause serious birth defects. See "What is the most important information about OPSUMIT?" If you miss a menstrual period, or think you might be pregnant, call your healthcare provider right away
  • You should not breast-feed if you take OPSUMIT. It is not known if OPSUMIT passes into breast milk. Talk to your healthcare provider about the best way to feed your baby if you take OPSUMIT

What are the possible side effects of OPSUMIT?

OPSUMIT can cause serious side effects, including:

  • Serious birth defects. See "What is the most important information about OPSUMIT?"
  • Some medicines that are like OPSUMIT can cause liver problems. Your healthcare provider should do blood tests to check your liver before you start taking OPSUMIT. Tell your healthcare provider if you have any of the following symptoms of liver problems while taking OPSUMIT:
    • Nausea or vomiting
    • Pain in the upper right stomach
    • Tiredness
    • Loss of appetite
    • Your skin or the whites of your eyes turn yellow
    • Dark urine
    • Fever
    • Itching
  • Fluid retention can happen within weeks after starting OPSUMIT. Tell your healthcare provider right away if you have any unusual weight gain or swelling of your ankles or legs. Your healthcare provider will look for the cause of any fluid retention.
  • Low red blood cell levels (anemia) can happen with OPSUMIT treatment, usually during the first weeks after starting therapy with OPSUMIT. In some cases a blood transfusion may be needed, but this is not common. Your healthcare provider will do blood tests to check your red blood cells before you start OPSUMIT and may also need to do these tests while you are taking OPSUMIT
  • Sperm count reduction. Reduced sperm counts have been observed in some men taking a medicine similar to OPSUMIT, an effect which might impair their ability to father a child. Tell your healthcare provider if remaining fertile is important to you

The most common side effects of OPSUMIT are:

  • Stuffy nose or sore throat, irritation of the airways (bronchitis), headache, flu, and urinary tract infection

Tell your healthcare provider about any side effect that bothers you or does not go away. These are not all the possible side effects of OPSUMIT. For more information, ask your healthcare provider or pharmacist.

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

Please see accompanying full Prescribing Information and Medication Guide, including an Important Warning about Serious Birth Defects.