- What is Ambrisentan?
- Indications and Benefits of Ambrisentan
- Ambrisentan Information Table
- How Does Ambrisentan Work?
- Brand Name Options
- Ambrisentan Dosage
- Usage Guide
- Ambrisentan Adverse Effects
- Missed Dose
- Overdose
- Ambrisentan Storage Information
- Warnings
- Ambrisentan Contraindications
- Interactions
- Alternatives to Ambrisentan
- Buy Ambrisentan From Canada: Cost & Coupons
- Frequently Asked Questions
- Disclaimer
- Price Match Guarantee
What is Ambrisentan?
Ambrisentan is an FDA-approved prescription treatment for pulmonary arterial hypertension, also known as PAH, which is high blood pressure in the blood vessels of the lungs.
It may be used alone or with tadalafil to help improve exercise ability and slow disease progression. Many patients search for options like buy ambrisentan online or ambrisentan cost when exploring treatment.
This treatment is usually prescribed to adults diagnosed with PAH who have symptoms such as shortness of breath, fatigue, or reduced physical activity. It works by relaxing and widening blood vessels in the lungs, which helps blood flow more easily. Patients looking for affordable options often search for ambrisentan price or buy ambrisentan in Canada as part of their care plan.
Indications and Benefits of Ambrisentan
Ambrisentan is prescribed to help manage pulmonary arterial hypertension and improve how the body handles physical activity.
FDA-approved indications
- Ambrisentan is approved for the treatment of pulmonary arterial hypertension, also called PAH, which is a condition where the blood vessels in the lungs become narrowed and increase pressure.
- It is used in adults with World Health Organization Group 1 PAH, including idiopathic PAH, heritable PAH, and PAH linked to connective tissue diseases such as scleroderma.
- It can be used alone or together with tadalafil, a phosphodiesterase type 5 inhibitor, to help lower pressure in the lungs and reduce the risk of disease progression.
Clinical benefits
- Ambrisentan has been shown to improve exercise capacity, often measured by the six-minute walk test, where patients were able to walk a longer distance after 12 weeks of treatment compared to baseline.
- Clinical studies have shown that it helps delay disease worsening, meaning patients experience slower progression of symptoms such as shortness of breath and fatigue.
- In the AMBITION trial, early combination treatment with ambrisentan and tadalafil reduced the risk of clinical failure by about 50 percent compared to using either treatment alone. Clinical failure includes hospitalization, disease progression, or death.
- It works by blocking endothelin 1, a substance in the body that causes blood vessels to tighten, which helps relax and widen the pulmonary arteries and improve blood flow.
- Long-term use has shown an acceptable safety profile, meaning most patients are able to continue treatment with manageable side effects under regular monitoring.
Off-label use
- There are no common or widely accepted off-label uses, but in some cases, it may be considered for other forms of pulmonary hypertension based on clinical evaluation and specialist guidance.
Ambrisentan Information Table
| Category | Details |
| Brand Name | Letairis |
| Generic Name | ambrisentan |
| Medication Class | Endothelin receptor antagonist, which helps relax narrowed blood vessels in the lungs |
| Primary Use | Treatment of pulmonary arterial hypertension, also called PAH, WHO Group 1, to improve exercise ability and delay clinical worsening |
| Additional Uses / Off-Label | FDA-approved for use with tadalafil to reduce the risk of disease progression and hospitalization from worsening PAH. No common off-label use is clearly listed in the FDA label |
| Available Form | Film-coated oral tablet |
| Method of Administration | Taken by mouth. Tablets should not be split, crushed, or chewed |
| Available Dosage Strengths | 5 mg and 10 mg tablets |
| Dosing Frequency | Usually taken once daily, with or without food |
| Storage Instructions | Store at 25°C or 77°F. Short-term storage between 15°C and 30°C or 59°F and 86°F is allowed. Keep in the original packaging |
| Pregnancy & Breastfeeding | Do not use during pregnancy because it may harm an unborn baby. Females must follow REMS program rules, including pregnancy testing and birth control. For breastfeeding, patients should choose either Letairis treatment or breastfeeding, not both |
| Major Drug Interactions | The FDA label identifies cyclosporine as the main clinically relevant interaction because it can increase ambrisentan exposure, so the ambrisentan dose should be limited to 5 mg once daily. Tadalafil is an approved combination option, but swelling can be more common when used together |
| Manufacturer | Gilead Sciences, Inc. |
How Does Ambrisentan Work?
Ambrisentan works by blocking a natural substance in the body called endothelin. Endothelin causes blood vessels to tighten and narrow, especially in the lungs.
When this happens, it becomes harder for blood to flow, and the pressure inside the lungs increases. Ambrisentan targets specific receptors, called endothelin type A receptors, and blocks their action.
This helps relax and widen the blood vessels in the lungs, allowing blood to flow more easily and reducing pressure.
By improving blood flow, ambrisentan helps the heart pump blood to the lungs with less effort. This can lead to better breathing and improved ability to stay active over time.
The treatment starts working in the body within a few hours, but most patients notice better exercise ability after several weeks of regular use. Its effects last throughout the day, which is why it is taken once daily.
Continuous use is important to maintain steady control of pulmonary arterial hypertension symptoms.
Brand Name Options
Ambrisentan is available under the brand name Letairis, which is widely recognized in the United States for the treatment of pulmonary arterial hypertension.
In addition to the brand version, generic ambrisentan tablets are also available and contain the same active ingredient with the same intended effect.
These options give patients flexibility when it comes to access and cost, while still meeting strict quality and safety standards set by regulatory authorities.
Ambrisentan Dosage
Ambrisentan is available as oral tablets in two strengths, 5 mg and 10 mg. The 5 mg tablet is usually used as the starting dose, while the 10 mg tablet may be used if a higher dose is needed and well tolerated.
These strengths allow gradual dose adjustment based on patient response and safety.
The dose of ambrisentan is based on your condition and how well your body responds to treatment.
Available Dosage Strengths and Forms
- Oral film-coated tablets
- 5 mg tablet
- 10 mg tablet
Dosage Chart
| Condition | Starting Dose | Maintenance Dose | Maximum Dose |
| Pulmonary Arterial Hypertension (PAH) | 5 mg once daily | May increase to 10 mg once daily after about 4 weeks if tolerated | 10 mg once daily |
Usage Guide
Follow these simple steps to take ambrisentan safely and correctly, especially if this is your first time using it.
Step-by-step instructions
- Take ambrisentan by mouth once a day, at the same time each day, to keep a steady level in your body.
- You can take it with or without food, but try to stay consistent with your routine.
- Swallow the tablet whole with water. Do not crush, split, or chew the tablet.
- Follow your prescribed ambrisentan dose exactly.
- Ambrisentan pediatric dosage has not been established.
- Continue taking it daily, even if you start to feel better, unless your doctor tells you to stop.
Important notes
- Ambrisentan is not an injection, so there are no preparation or self-injection steps.
- Avoid stopping treatment suddenly, as this may worsen your condition.
- Inform your doctor about all other treatments you are taking to avoid interactions.
How to know it is working?
- You may notice improved breathing and less shortness of breath during daily activities.
- You may be able to walk longer distances or feel less tired over time.
- Full benefits may take several weeks, so regular use is important.
Ambrisentan Adverse Effects
Ambrisentan may cause side effects, although not everyone experiences them. Below are the most reported ambrisentan common side effects and important ambrisentan adverse effects to watch for.
| Common Side Effects (with frequency %) | Serious Side Effects |
| Peripheral edema or swelling of hands, feet, or ankles (about 17% to 23%) | Swelling of the face, lips, tongue, or throat, which may signal a severe allergic reaction and requires emergency care |
| Nasal congestion or sinus symptoms (about 13% to 15%) | Trouble breathing or swallowing, which may indicate airway swelling |
| Flushing or warm skin (reported) | Sudden weight gain or severe swelling, which may be a sign of fluid retention |
| Fast heartbeat or palpitations (reported) | Signs of liver problems, such as yellowing of the skin or eyes, dark urine, or pain in the upper right abdomen |
| Headache (about 8% to 15%) | Severe tiredness, nausea, or vomiting, which may be linked to liver or blood-related issues |
| Pale skin, which may be linked to low red blood cell levels | Loss of appetite, itching, or flu-like symptoms may indicate a serious reaction |
Missed Dose
If you miss a dose of ambrisentan, take it as soon as you remember on the same day.
Since it is taken once daily, you can still take the missed dose if there is enough time before your next scheduled dose.
If it is already close to your next dose, skip the missed one and continue with your regular schedule.
Do not take two doses at the same time or double your dose to make up for the missed one.
Overdose
An overdose of ambrisentan may cause symptoms such as headache, flushing, dizziness, nausea, and nasal congestion.
If you think too much has been taken, act quickly. Call Poison Control at 1-800-222-1222 for immediate guidance, or go to the nearest emergency room.
If the person has trouble breathing, collapses, or cannot be awakened, call 911 right away.
There is no specific antidote for ambrisentan overdose, so treatment focuses on managing symptoms and providing supportive care.
Ambrisentan Storage Information
Store ambrisentan tablets at room temperature, around 20°C to 25°C (68°F to 77°F), both before and after opening. Keep the tablets in their original container, tightly closed, to protect them from moisture. Store in a dry place away from excess heat and humidity, so avoid bathrooms or areas near sinks. Protect from direct light.
There is no special time limit after opening, as long as the tablets are stored properly and before the expiration date. Do not freeze this product. Keep out of reach of children and pets.
If the medication has expired or is no longer needed, do not flush it. Use a local take-back program or ask a pharmacist for safe disposal options.
Warnings
Precautions
- Patients with a known allergy to ambrisentan or any of its ingredients should not take this treatment, as it may cause allergic reactions.
- Patients taking cyclosporine should use caution, because this drug can increase the levels of ambrisentan in the body and may require dose adjustment and close monitoring.
- Patients diagnosed with idiopathic pulmonary fibrosis should not use ambrisentan, as it may worsen this lung condition.
- Patients with a history of liver disease should be monitored closely, since ambrisentan may affect liver function.
- Ambrisentan may lower red blood cell levels, which can lead to anemia, so patients should be aware of symptoms such as fatigue or weakness.
- Breastfeeding is not recommended while taking ambrisentan, as it is not known if the drug passes into breast milk and may affect the infant.
Patients Who Need Extra Caution
- Patients with liver disease require careful monitoring because their condition may increase the risk of side effects.
- Patients with anemia should be monitored, as this treatment may further lower red blood cell levels.
- Females of reproductive potential must follow strict pregnancy prevention steps due to the high risk of fetal harm.
Monitoring Requirements
- Females enrolled in the REMS program must undergo regular pregnancy testing before and during treatment to prevent exposure during pregnancy.
- Blood tests should be performed to monitor liver function and red blood cell levels throughout treatment.
- Regular check-ups are important to assess how well the treatment is working and to detect any side effects early.
These ambrisentan black boxed warning and precautions highlight the importance of careful monitoring and proper use.
FDA Black Box Warning: Risk of Fetal Harm (ambrisentan pregnancy)Ambrisentan can cause serious congenital disabilities if taken during pregnancy. It must not be used by patients who are pregnant or planning to become pregnant. Females who can become pregnant must have a negative pregnancy test before starting treatment and must use reliable birth control during treatment and for at least one month after stopping. Due to this risk, ambrisentan is only available through a restricted program called REMS. |
Ambrisentan Contraindications
The following ambrisentan contraindications identify when this treatment must not be used due to serious safety risks:
- Ambrisentan during pregnancy: Ambrisentan must not be used during pregnancy because it can cause severe congenital disabilities. Studies have shown harmful effects on fetal development, so it is strictly avoided in pregnant patients.
- Females who are pregnant or may become pregnant without proper protection: This treatment should not be used unless strict pregnancy prevention measures are followed, due to the high risk of fetal harm.
- Idiopathic Pulmonary Fibrosis (IPF): Ambrisentan is contraindicated in patients with IPF, which is a long-term lung condition where the lung tissue becomes scarred and stiff, making it harder to breathe and for oxygen to enter the blood. This includes patients with pulmonary hypertension related to IPF, because studies have shown that ambrisentan does not improve outcomes and may worsen the condition.
These conditions represent patient groups who should never take ambrisentan due to the risk of serious harm.
Interactions
Ambrisentan can interact with certain drugs that affect how it is processed in the body or increase the risk of side effects.
| Drug / Substance | What Happens | What to Do |
| Cyclosporine | Cyclosporine can increase ambrisentan levels in the body by about two times, which may raise the risk of side effects | Limit ambrisentan to 5 mg once daily and monitor closely |
| Sparsentan | Using both together is not recommended because it may increase the risk of harmful effects on blood vessels and kidney function | Avoid using together unless specifically directed |
| Methotrexate | May increase the risk of liver problems when used with ambrisentan | Monitor liver function and use with caution |
| Azathioprine | May increase the risk of liver toxicity or blood-related side effects | Regular blood tests and careful monitoring are needed |
| Mercaptopurine | Similar to azathioprine, it may raise the risk of liver and blood-related issues | Use with caution and monitor lab results |
| Levoketoconazole | May increase ambrisentan levels by affecting how it is broken down in the body | Dose adjustment or monitoring may be required |
| Simeprevir | May increase drug exposure and risk of side effects | Monitor closely for side effects and adjust treatment if needed |
Food, Supplements, and Alcohol
- Food does not significantly affect how ambrisentan works, so that it can be taken with or without meals.
- There are no major known supplement interactions, but patients should still inform their doctor about all vitamins or herbal products.
- Alcohol should be used with caution, as both alcohol and ambrisentan can affect liver function, which may increase the risk of liver-related side effects.
Alternatives to Ambrisentan
Several other treatments are available for pulmonary arterial hypertension. These options work through different pathways in the body and may be selected based on individual patient needs.
| Drug Name | Generic Name | Drug Class | Key Difference from Ambrisentan | Best For |
| Letairis | ambrisentan | Endothelin receptor antagonist | Same active ingredient, different brand name | Patients prescribed the branded version of ambrisentan |
| Tracleer | bosentan | Endothelin receptor antagonist | Blocks two endothelin receptors instead of one | Patients needing broader endothelin pathway targeting |
| Opsumit | macitentan | Endothelin receptor antagonist | Designed for longer receptor binding and once daily dosing | Patients looking for a similar class with a different dosing profile |
| Revatio | sildenafil | Phosphodiesterase type 5 inhibitor | Works on the nitric oxide pathway instead of the endothelin pathway | Patients who may benefit from improved blood vessel relaxation through a different mechanism |
| Adcirca | tadalafil | Phosphodiesterase type 5 inhibitor | Longer acting than sildenafil and often used in combination therapy | Patients needing once-daily dosing or combination treatment |
Buy Ambrisentan From Canada: Cost & Coupons
Buying medication in the United States can be expensive. The cost of ambrisentan can reach about $13,000 to $13,500 per month for brand Letairis, while generic options may still cost $2,000 or more monthly.
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Price Comparison
| Source | Price Per Dose | Price Per Month | 3-Month Supply |
| US Retail (Brand Letairis) | ~$433 to $450 | ~$13,000 to $13,500 | ~$39,000+ |
| US Retail (Generic) | ~$66+ | ~$2,000+ | ~$6,000+ |
| Pharma Giant Price | ~$49.25 | ~$1,477.60 | ~$4,432.80 |
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Pharma Giant’s Guarantee
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Frequently Asked Questions
Buying Ambrisentan from Canada
FDA-Prescription, Off-Label Information, and Limitations
Dosage & Administration
Adverse Reactions
Food & Drug Interactions
Storage & Travel
Drug Comparison
Disclaimer
Pharma Giant provides medical information to help you better understand medications and medical conditions.This content is for informational use only and does not replace advice from a licensed medical practitioner. Consult your doctor or pharmacist before starting or changing any medication. All our partners follow strict safety standards set by their country’s health authorities to make sure you receive safe and high-quality medications.
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