Riociguat: Treatment for Pulmonary Hypertension, Uses & Dosage

Summary of Key Points

Riociguat is a prescription medication used to treat specific types of pulmonary hypertension, a condition characterized by high blood pressure in the arteries of the lungs. It works by relaxing blood vessels, improving blood flow, and reducing the strain on the heart. Riociguat can help enhance exercise capacity and slow the progression of the disease. Always consult your healthcare provider before starting or adjusting your dose.

Names of Medication

US Brand Name: Adempas (Riociguat)

The generic name refers to the active ingredient in the medication, while the brand name is assigned by the manufacturer. In this case, Riociguat is the generic name.

Pharmacologic Category

Soluble Guanylate Cyclase (sGC) Stimulator

Dosing Information for Riociguat

Riociguat is prescribed for various forms of pulmonary hypertension. It is essential to follow your doctor’s instructions carefully. Do not adjust your dose without consulting your healthcare provider. You can schedule a telemedicine appointment with one of our providers for further guidance.

Pulmonary Arterial Hypertension (PAH)

The initial dose is 1 mg three times daily. The dose may be increased by 0.5 mg every two weeks, up to a maximum of 2.5 mg three times daily, depending on how well the patient tolerates the medication.

Chronic Thromboembolic Pulmonary Hypertension (CTEPH)

The initial dose is 1 mg three times daily. The dose may be increased by 0.5 mg every two weeks, up to a maximum of 2.5 mg three times daily, based on the patient’s response and tolerance.

Heart Failure Related to Pulmonary Hypertension

Dosing for heart failure related to pulmonary hypertension is typically individualized. The starting dose is usually 1 mg three times daily, with adjustments made based on the patient’s response.

Other Pulmonary Hypertension Conditions

For conditions such as Eisenmenger Syndrome, Left Heart Disease, Connective Tissue Disease, Congenital Heart Disease, Idiopathic Pulmonary Hypertension, and Systemic Sclerosis, the dosing regimen is similar to that for PAH and CTEPH. The starting dose is 1 mg three times daily, with increases of 0.5 mg every two weeks, up to a maximum of 2.5 mg three times daily.

Dosage Forms and Strengths

Riociguat is available in tablet form with the following strengths:

1. 0.5 mg
2. 1 mg
3. 1.5 mg
4. 2 mg
5. 2.5 mg

Administration Instructions for Riociguat

Take Riociguat exactly as prescribed by your healthcare provider. It is typically taken three times a day, with or without food. Swallow the tablet whole with water. If you miss a dose, take it as soon as you remember, but skip it if it’s almost time for your next dose. Do not take two doses at once. Avoid smoking, as it can reduce the medication’s effectiveness. If you have any questions about how to take Riociguat, consult your healthcare provider or schedule a telemedicine appointment with us.

Adverse Reactions and Side Effects of Riociguat

Like all medications, Riociguat can cause side effects. Some are common and mild, while others may be more serious. If you experience any side effects, contact your healthcare provider immediately.

Common Side Effects

1. Headache: Mild to moderate headaches are common and usually improve over time.
2. Dizziness: You may feel lightheaded, especially when standing up quickly, due to the medication’s blood pressure-lowering effects.
3. Indigestion: Some patients experience stomach discomfort or heartburn.
4. Nausea: Feeling nauseous is common but usually improves as your body adjusts to the medication.

Serious Side Effects

1. Low Blood Pressure (Hypotension): Riociguat can cause a significant drop in blood pressure, leading to fainting or dizziness.
2. Bleeding: In rare cases, Riociguat may increase the risk of bleeding, especially in patients with certain medical conditions.
3. Heart Palpitations: Some patients may experience an irregular heartbeat or feel like their heart is racing.

Contraindications for Riociguat

A contraindication is a specific situation where a medication should not be used because it could cause harm. These are critical to know, as taking a medication in these situations can lead to serious side effects or complications.

Contraindications for Taking Riociguat

1. Pregnancy: Riociguat can harm an unborn baby. It is contraindicated in pregnant women due to the risk of birth defects or miscarriage.
2. Nitrates or Nitric Oxide Donors: Medications like nitroglycerin or isosorbide (Imdur, Isordil) are contraindicated because combining them with Riociguat can cause a dangerous drop in blood pressure.
3. PDE5 Inhibitors: Medications like sildenafil (Viagra, Revatio) or tadalafil (Cialis, Adcirca) are contraindicated as they also lower blood pressure, and using them with Riociguat can lead to dangerously low blood pressure.
4. Severe Liver Disease: Patients with severe liver impairment should not take Riociguat, as the liver may not process the medication properly, increasing the risk of side effects.
5. Severe Kidney Disease: Riociguat is contraindicated in patients with severe kidney impairment or those on dialysis, as the kidneys may not eliminate the drug effectively, raising the risk of toxicity.

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Drug to Drug Interactions

Riociguat can interact with other medications, potentially affecting its effectiveness or increasing the risk of serious side effects. It’s important to inform your healthcare provider about all the medications you are currently taking, including over-the-counter drugs, vitamins, and herbal supplements.

Medications That Interact with Riociguat

Nitrates: Nitroglycerin (Nitrostat), Isosorbide (Imdur, Isordil)

PDE5 Inhibitors: Sildenafil (Viagra, Revatio), Tadalafil (Cialis, Adcirca)

Strong CYP3A4 Inhibitors: Ketoconazole (Nizoral), Itraconazole (Sporanox)

Strong CYP3A4 Inducers: Rifampin (Rifadin), Phenytoin (Dilantin)

Antacids: Aluminum hydroxide/magnesium hydroxide (Maalox, Mylanta) – These can reduce Riociguat absorption if taken too closely together.

Riociguat in Pregnancy

Is it Safe to Take Riociguat During Pregnancy?

No, Riociguat is not safe during pregnancy. It can cause serious harm to an unborn baby, including birth defects or miscarriage. Women who are pregnant or planning to become pregnant should avoid taking Riociguat. If you are of childbearing age, it’s essential to use effective birth control while on this medication and for at least one month after stopping it. If you become pregnant while taking Riociguat, contact your healthcare provider immediately.

Riociguat While Breastfeeding

Is it Safe to Take Riociguat While Breastfeeding?

It is not known if Riociguat passes into breast milk. However, due to the potential risk of serious side effects in a nursing infant, it is generally recommended that women avoid breastfeeding while taking Riociguat. If you are breastfeeding or planning to breastfeed, discuss your options with your healthcare provider to determine the safest course of action.

Estimated Cost of Riociguat

The cost of a 30-day supply of Riociguat without insurance can vary. With a GoodRx coupon, the estimated cost for a 30-day supply of 1 mg tablets ranges from $7,000 to $8,000. Prices may differ depending on the pharmacy and location. Be sure to check with your pharmacy or use a discount program like GoodRx to find the most affordable option.

Possible Alternatives to Riociguat

Depending on your condition, alternative treatments or lifestyle changes may help manage your symptoms. Always consult your healthcare provider before making any changes to your treatment plan. You can also schedule a telemedicine appointment with one of our providers to discuss your options in more detail.

Alternative Treatments for Pulmonary Arterial Hypertension (PAH)

Alternative medications: Ambrisentan (Letairis), Bosentan (Tracleer), Macitentan (Opsumit)

Lifestyle changes: Regular exercise, a low-sodium diet, and avoiding high altitudes

Alternative Treatments for Chronic Thromboembolic Pulmonary Hypertension (CTEPH)

Alternative treatments: Pulmonary endarterectomy (surgical removal of blood clots), balloon pulmonary angioplasty

Lifestyle changes: Smoking cessation, maintaining a healthy weight

Alternative Treatments for Heart Failure

Alternative medications: ACE inhibitors (Lisinopril), Beta-blockers (Metoprolol), Diuretics (Furosemide)

Lifestyle changes: Reducing salt intake, regular physical activity, and managing stress

Alternative Treatments for Pulmonary Hypertension

Alternative medications: Epoprostenol (Flolan), Treprostinil (Remodulin)

Lifestyle changes: Avoiding strenuous activities, maintaining a healthy weight

Alternative Treatments for Eisenmenger Syndrome

Alternative treatments: Oxygen therapy, heart-lung transplant in severe cases

Lifestyle changes: Avoiding high altitudes, staying hydrated

Alternative Treatments for Left Heart Disease

Alternative medications: ACE inhibitors (Enalapril), Beta-blockers (Carvedilol)

Lifestyle changes: Managing blood pressure, reducing alcohol intake

Alternative Treatments for Connective Tissue Disease

Alternative medications: Immunosuppressants (Methotrexate), Corticosteroids (Prednisone)

Lifestyle changes: Regular exercise, physical therapy

Alternative Treatments for Congenital Heart Disease

Alternative treatments: Surgical repair, catheter-based procedures

Lifestyle changes: Regular monitoring, avoiding strenuous activities

Alternative Treatments for Idiopathic Pulmonary Hypertension

Alternative medications: Bosentan (Tracleer), Prostacyclin analogs (Epoprostenol)

Lifestyle changes: Avoiding smoking, maintaining a healthy weight

Alternative Treatments for Systemic Sclerosis

Alternative medications: Immunosuppressants (Mycophenolate), Calcium channel blockers (Amlodipine)

Lifestyle changes: Physical therapy, avoiding cold exposure

Recent Updates on Riociguat Research

Recent research on Riociguat has focused on its long-term safety and effectiveness in treating pulmonary hypertension. A 2022 study published in the journal Chest found that Riociguat continues to show promise in improving exercise capacity and quality of life in patients with pulmonary arterial hypertension (PAH) and chronic thromboembolic pulmonary hypertension (CTEPH). Additionally, ongoing clinical trials are exploring the use of Riociguat in combination with other medications to enhance its effectiveness and reduce side effects.

As research continues, it’s important to stay informed about new findings. If you have questions about Riociguat or your treatment plan, consider scheduling a telemedicine appointment with one of our healthcare providers to discuss the latest updates and how they may apply to you.

James Kingsley

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