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Find helpful information and videos and support for Tyvaso, a prescription medicine approved for adults with pulmonary arterial hypertension (PAH) (WHO Group 1).

Glossary of terms

6-minute walk test (6MWT)
A test that tracks how far you can walk in 6 minutes. The 6-minute walk test is done during most of your doctor visits. The distance you can walk (known as your 6-minute walk distance, or 6MWD) helps your doctor assess the impact of your treatment and determine whether your treatment plan needs to be adjusted to improve your walk distance.
Experts recommend a treatment goal* of about 1444 feet or more (440 meters) in the 6-minute walk test.
*Low-risk 6MWD threshold from the 2015 ESC/ERS Guidelines for the Diagnosis and Treatment of Pulmonary Hypertension.
Endothelin receptor antagonist (ERA)
Class of medication used in PAH. Available in oral form. Ambrisentan, bosentan, and macitentan are ERAs.
Functional class (FC)
A system of 4 classes created by the World Health Organization to assess the severity of symptoms in patients with PAH.
Phosphodiesterase type 5 (PDE-5) inhibitor
Class of medication used to treat PAH. Available in oral form. Tadalafil and sildenafil are PDE-5 inhibitors.
A natural substance in your body that helps the blood vessels in your lungs stay open so that your heart can pump blood through your lungs.
Prostacyclin Analogue
A synthetic form of prostacyclin, designed to mimic some of the effects of natural prostacyclin, that helps to keep the blood flowing through your lungs. Tyvaso is an inhaled prostacyclin analogue used to treat pulmonary arterial hypertension (PAH) (WHO Group 1).
Pulmonary arterial hypertension (PAH)
A condition that is characterized by high blood pressure in the arteries of the lungs. It is a chronic and progressive rare disease that affects your heart’s ability to pump blood to your lungs.
Right heart catheterization
The only test that can confirm a PAH diagnosis; measures the pressure in your heart and the arteries in your lung.
Specialty Pharmacy Services (SPS) providers
Pharmacies that provide personalized care and are different from your local pharmacy.
About PAH

Important Safety Information for Tyvaso

Before you take Tyvaso, tell your healthcare provider about all of your medical conditions, including if you:

  • Have lung disease, such as asthma or chronic obstructive pulmonary disease (COPD)
  • Have a lung infection
  • Have liver or kidney problems
  • Have low blood pressure
  • Have bleeding problems
  • Are pregnant or plan to become pregnant. It is not known if Tyvaso will harm your unborn baby.
  • Are breast-feeding or plan to breast-feed. It is not known if Tyvaso passes into your breast milk. Talk to your healthcare provider about the best way to feed your baby during treatment with Tyvaso.

Tell your healthcare provider about all the medicines you take , including prescription and over-the-counter medicines, vitamins, and herbal supplements. Tyvaso and other medicines may affect each other.

Especially tell your healthcare provider if you take:

  • Medicines used to treat high blood pressure or heart disease
  • Medicines that decrease blood clotting (anticoagulants)
  • Water pills (diuretics)
  • Gemfibrozil (Lopid) or rifampin (Rimactane, Rifadin, Rifamate, Rifater)

What are the possible side effects of Tyvaso?

Tyvaso can cause serious side effects, including:

  • Low blood pressure (symptomatic hypotension). If you have low blood pressure, Tyvaso may lower your blood pressure more
  • Bleeding problems. Tyvaso may increase the risk of bleeding in people who take blood thinners (anticoagulants)

The most common side effects of Tyvaso are cough, headache, throat irritation and pain, nausea, reddening of the face and neck (flushing), fainting or loss of consciousness, dizziness, and diarrhea. These are not all the possible side effects of Tyvaso. Call your doctor for medical advice about side effects.

You may report side effects to the FDA at www.fda.gov/MedWatch or call 1-800-FDA-1088.

What is Tyvaso?

Tyvaso (treprostinil) is a prescription medicine used in adults to treat pulmonary arterial hypertension (PAH; WHO Group I), which is high blood pressure in the arteries of your lungs. Tyvaso can improve the ability to exercise. Your ability to exercise decreases 4 hours after taking Tyvaso. It is not known if Tyvaso is safe and effective in children under 18 years of age.


Please see the Full Prescribing Information, Patient Product Information, and the Tyvaso Inhalation System Instructions for Use manual.

For additional information about Tyvaso, visit www.tyvaso.com or call 1-877-UNITHER (1-877-864-8437).

This information is provided for an informational purpose and is not intended as treatment advice. Patients should consult a healthcare professional for treatment advice.

The information contained in this section of the site is clinical in nature and specifically created for healthcare professionals. If you are not a US healthcare professional, please click CLOSE to return to the consumer section of the site.
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