What is Iloprost: Uses, Dosage, Side Effects and More

Iloprost is a specialized medication that helps open up blood vessels in your lungs when they've become dangerously narrow. It's a synthetic version of a natural substance your body makes called prostacyclin, which keeps blood flowing smoothly through your arteries.

This inhaled medication is primarily used to treat pulmonary arterial hypertension (PAH), a serious condition where the blood pressure in your lung arteries becomes dangerously high. When you breathe in iloprost through a special nebulizer, it goes directly to work relaxing those tight blood vessels, making it easier for your heart to pump blood through your lungs.

What is Iloprost Used For?

Iloprost treats pulmonary arterial hypertension, a condition where the small arteries in your lungs become thick and narrow. This makes your heart work much harder to pump blood through your lungs, which can lead to heart failure if left untreated.

The medication is specifically approved for people with PAH who have moderate to severe symptoms. Your doctor might prescribe it if you're experiencing shortness of breath, chest pain, or fatigue that limits your daily activities. It's particularly helpful for people who haven't responded well enough to other PAH treatments.

Sometimes doctors also use iloprost for severe cases of Raynaud's phenomenon, where blood vessels in your fingers and toes constrict painfully in response to cold or stress. In rare cases, it might be prescribed for certain types of blood clots in the lungs, though this is not its primary use.

How Does Iloprost Work?

Iloprost works by mimicking prostacyclin, a powerful natural substance your body produces to keep blood vessels relaxed and open. When you inhale the medication, it travels directly to the small blood vessels in your lungs where it's needed most.

Once there, iloprost tells the smooth muscle cells in your blood vessel walls to relax and widen. This process, called vasodilation, immediately reduces the pressure in your lung arteries. The medication also helps prevent blood clots from forming and reduces inflammation in the blood vessel walls.

Think of it like opening a partially blocked garden hose - when the pathway widens, water flows much more easily. Iloprost is considered a moderately strong medication that provides targeted relief directly where the problem exists, rather than affecting your entire circulatory system.

How Should I Take Iloprost?

Iloprost must be inhaled using a special nebulizer device that your healthcare team will provide and teach you to use properly. You'll typically take it 6 to 9 times per day, spacing doses about 2 to 3 hours apart during your waking hours.

Each inhalation session takes about 5 to 15 minutes to complete. You'll breathe normally through the nebulizer mouthpiece while the machine converts the liquid medication into a fine mist that reaches deep into your lungs. It's important to sit upright during treatment and breathe calmly and deeply.

You can take iloprost with or without food, but many people find it easier to coordinate with meals since you'll be taking it frequently throughout the day. Make sure to clean your nebulizer equipment after each use according to the manufacturer's instructions to prevent infections.

Never mix iloprost with other medications in the same nebulizer unless specifically instructed by your doctor. Store unopened vials in the refrigerator, but let them reach room temperature before use.

How Long Should I Take Iloprost For?

Most people with pulmonary arterial hypertension need to take iloprost long-term to manage their condition effectively. PAH is a chronic condition that requires ongoing treatment to keep symptoms controlled and prevent the disease from getting worse.

Your doctor will monitor your response to the medication through regular check-ups, including tests that measure how well your heart and lungs are working. If iloprost is helping you feel better and your test results show improvement, you'll likely continue taking it indefinitely.

Some people might need to switch to different medications or add other treatments over time as their condition changes. Never stop taking iloprost suddenly without talking to your doctor first, as this could cause your symptoms to return quickly and potentially lead to dangerous complications.

What Are the Side Effects of Iloprost?

Like all medications, iloprost can cause side effects, though many people tolerate it well once they adjust to the treatment routine. The most common side effects are related to the medication's blood vessel-opening effects throughout your body.

Here are the side effects you might experience, starting with the most common ones that affect many people:

• Jaw pain or muscle pain - This happens because iloprost affects blood flow to your jaw muscles during chewing
• Headaches - Usually mild and often improve as your body adjusts to the medication
• Flushing or feeling warm - Your face and chest might feel hot as blood vessels dilate
• Nausea or upset stomach - Taking the medication with food sometimes helps
• Dizziness or lightheadedness - Especially when standing up quickly
• Cough or throat irritation - From the inhalation process itself

These common side effects are generally manageable and often become less bothersome as you continue treatment. However, you should contact your doctor if they become severe or interfere with your daily activities.

Less common but more serious side effects can occur, and you should seek medical attention if you experience any of these:

• Severe drop in blood pressure - Causing fainting, severe dizziness, or confusion
• Rapid or irregular heartbeat - Your heart might race or skip beats
• Chest pain - Different from your usual PAH symptoms
• Severe breathing problems - Worsening shortness of breath or wheezing
• Signs of lung infection - Fever, colored sputum, or worsening cough

Rare but potentially serious complications include severe allergic reactions, significant bleeding problems, or dangerous drops in blood pressure that require immediate medical care. While these are uncommon, it's important to know the warning signs and seek help promptly if they occur.

Who Should Not Take Iloprost?

Iloprost isn't safe for everyone, and your doctor will carefully review your medical history before prescribing it. People with certain heart conditions or those taking specific medications may not be good candidates for this treatment.

You should not take iloprost if you have any of these conditions:

• Severe heart disease - Including recent heart attack, unstable angina, or severe heart rhythm problems
• Very low blood pressure - Iloprost can lower blood pressure further
• Active bleeding disorders - The medication can increase bleeding risk
• Severe liver disease - Your body may not process the medication properly
• Known allergy to iloprost or similar medications - Including other prostacyclin drugs

Your doctor will also be cautious about prescribing iloprost if you have kidney problems, are pregnant or breastfeeding, or take blood thinners. Certain medications can interact dangerously with iloprost, particularly those that also lower blood pressure.

People over 65 may need special monitoring since they're more likely to experience side effects. Always tell your doctor about all medications, supplements, and herbal products you're taking before starting iloprost.

Iloprost Brand Names

Iloprost is available under several brand names depending on your location and the specific formulation. In the United States, the most common brand name is Ventavis, which is the inhaled form used for pulmonary arterial hypertension.

Other brand names you might encounter include Ilomedin, which is used in some countries for intravenous administration. Some regions may have additional brand names or generic versions available. Your pharmacist can help you identify which specific brand or formulation you're receiving.

Regardless of the brand name, the active ingredient is the same, but the delivery method and concentration might vary. Always use the exact product your doctor prescribed and don't substitute between different brands without medical guidance.

Iloprost Alternatives

Several other medications can treat pulmonary arterial hypertension if iloprost isn't right for you or isn't working well enough. Your doctor might consider these alternatives based on your specific situation and how you respond to treatment.

Other prostacyclin-based medications include epoprostenol (Flolan), which is given through a continuous IV infusion, and treprostinil (Remodulin), which can be given as an injection under the skin, through an IV, or as an inhaled medication. These work similarly to iloprost but have different dosing schedules and side effect profiles.

Different classes of PAH medications include endothelin receptor antagonists like bosentan (Tracleer) and ambrisentan (Letairis), which work by blocking substances that cause blood vessels to narrow. Phosphodiesterase-5 inhibitors such as sildenafil (Revatio) and tadalafil (Adcirca) help blood vessels relax through a different mechanism.

Newer medications like riociguat (Adempas) work on yet another pathway to help blood vessels stay open. Many people with PAH end up taking combinations of these medications to get the best results.

Is Iloprost Better Than Epoprostenol?

Both iloprost and epoprostenol are prostacyclin medications that work similarly to treat PAH, but they have important differences that make each better suited for different people. Neither is universally "better" - the choice depends on your lifestyle, other health conditions, and how you respond to treatment.

Iloprost's main advantage is convenience since you inhale it several times a day rather than receiving a continuous IV infusion. This means you don't need a permanent catheter or portable pump, which significantly reduces the risk of serious infections and gives you more freedom in your daily activities.

Epoprostenol, on the other hand, provides continuous treatment and may be more effective for people with very severe PAH. However, it requires a permanent central line catheter and a continuous infusion pump, which increases the risk of life-threatening infections and complications.

Your doctor will consider factors like the severity of your PAH, your ability to manage complex medical equipment, your infection risk, and your personal preferences when choosing between these medications. Some people start with iloprost and switch to epoprostenol if their condition worsens, while others might use both medications together.