What is Levodopa Inhalation: Uses, Dosage, Side Effects and More

Levodopa inhalation is a breakthrough medication that delivers levodopa directly to your lungs through a specialized inhaler device. This innovative treatment helps people with Parkinson's disease manage sudden "off" episodes when their regular oral medications aren't providing adequate symptom control.

Unlike traditional levodopa pills that must travel through your digestive system, the inhaled form gets absorbed quickly into your bloodstream through your lungs. This faster delivery can help restore your movement and reduce stiffness within minutes rather than waiting 30-60 minutes for oral medications to take effect.

What is Levodopa Inhalation?

Levodopa inhalation is a dry powder form of levodopa that you breathe in using a special inhaler called an Inbrija device. It's specifically designed as a rescue medication for people with Parkinson's disease who experience unpredictable "off" periods throughout the day.

The medication contains the same active ingredient as oral levodopa pills, but it's formulated as tiny particles that can be absorbed through your lung tissue. When you inhale the powder, it quickly enters your bloodstream and travels to your brain, where it gets converted to dopamine to help improve your motor symptoms.

This inhaled version was approved by the FDA in 2018 as the first and only inhaled treatment for Parkinson's disease off episodes. It's meant to work alongside your regular oral Parkinson's medications, not replace them entirely.

What is Levodopa Inhalation Used For?

Levodopa inhalation is specifically used to treat "off" episodes in people with Parkinson's disease who are already taking carbidopa/levodopa medication. Off episodes are times when your regular medication wears off and your Parkinson's symptoms return or worsen.

During these off periods, you might experience increased tremors, muscle stiffness, slow movement, or difficulty walking. These episodes can happen unpredictably throughout the day, even when you're taking your oral medications as prescribed. The inhaled levodopa provides quick relief when these breakthrough symptoms occur.

Your doctor will only prescribe this medication if you're already established on a stable regimen of oral carbidopa/levodopa. It's not intended for people who are newly diagnosed with Parkinson's disease or those who haven't tried oral levodopa therapy first.

How Does Levodopa Inhalation Work?

Levodopa inhalation works by delivering medication directly to your lungs, where it's rapidly absorbed into your bloodstream. This bypasses your digestive system entirely, which is why it works faster than oral medications.

Once the levodopa reaches your brain, it gets converted into dopamine by an enzyme called aromatic L-amino acid decarboxylase. Dopamine is the neurotransmitter that helps control movement, and people with Parkinson's disease have decreased levels of this important chemical in their brains.

The inhaled form is considered a moderate-strength medication that provides temporary relief rather than long-term symptom management. It typically begins working within 10-15 minutes and can provide symptom improvement for about 1-2 hours, giving you time for your next scheduled oral dose to take effect.

How Should I Take Levodopa Inhalation?

You should take levodopa inhalation exactly as your doctor prescribes, using only the special Inbrija inhaler device that comes with your medication. The standard dose is usually one capsule (84 mg) inhaled when you experience an off episode, with a maximum of 5 doses per day.

Before using the inhaler, make sure your hands are clean and dry. Remove one capsule from the blister pack just before use, and place it in the inhaler chamber. Hold the device upright, breathe out completely, then place your lips around the mouthpiece and inhale deeply and quickly to ensure you get the full dose.

You can use this medication with or without food, and you don't need to drink water before or after inhaling. However, it's important to rinse your mouth with water after each use to remove any remaining powder and reduce the risk of throat irritation. Don't eat or drink anything for at least 5 minutes after taking your dose.

Always keep your inhaler and capsules in a dry place at room temperature. Never wash the inhaler device with water, and replace it according to your doctor's instructions, typically every few months.

How Long Should I Take Levodopa Inhalation For?

You should continue taking levodopa inhalation for as long as your doctor recommends, which is typically as long as you continue experiencing off episodes with your Parkinson's disease. This medication is designed for long-term use as a rescue treatment alongside your regular oral medications.

Your doctor will regularly assess whether the inhaled levodopa is still helping your symptoms and may adjust your overall Parkinson's treatment plan over time. Some people may need to use it several times a day, while others might only need it occasionally when off episodes occur.

The duration of treatment depends on how your Parkinson's disease progresses and how well your other medications are controlling your symptoms. Never stop using this medication suddenly without talking to your doctor first, as this could lead to a worsening of your symptoms.

What Are the Side Effects of Levodopa Inhalation?

Like all medications, levodopa inhalation can cause side effects, though many people tolerate it well. The most common side effects are usually mild and related to the inhalation process itself.

Let's look at the side effects you might experience, starting with the most common ones that affect your respiratory system:

• Cough (affects about 15% of people)
• Upper respiratory tract infection
• Throat irritation or discomfort
• Sputum discoloration (your mucus might appear darker)
• Hoarseness or voice changes

These respiratory effects usually occur because the powder can irritate your airways, but they're generally mild and temporary. Rinsing your mouth after each use can help reduce throat irritation.

Beyond respiratory effects, you might also experience side effects similar to those from oral levodopa medications:

• Nausea or stomach upset
• Dizziness or lightheadedness
• Dyskinesia (involuntary movements)
• Hallucinations or confusion
• Changes in blood pressure

These effects happen because levodopa affects your entire body once it enters your bloodstream, not just your brain.

Some rare but serious side effects require immediate medical attention. These include severe breathing difficulties, chest pain, significant changes in heart rhythm, or sudden onset of extreme drowsiness. If you experience any of these symptoms, contact your doctor right away or seek emergency medical care.

Who Should Not Take Levodopa Inhalation?

Several groups of people should not use levodopa inhalation due to safety concerns. Your doctor will carefully evaluate whether this medication is appropriate for your specific situation.

People with certain lung conditions should avoid this medication because inhaling the powder could worsen their breathing problems:

• Active asthma or a history of asthma attacks
• Chronic obstructive pulmonary disease (COPD)
• Other chronic lung diseases that affect breathing
• Recent respiratory infections or pneumonia

The powder particles can trigger breathing difficulties or worsen existing lung inflammation in these conditions.

Additionally, certain medical conditions and medication interactions make levodopa inhalation unsafe:

• People taking monoamine oxidase inhibitors (MAOIs) within the past 14 days
• Those with narrow-angle glaucoma
• People with suspicious skin lesions or a history of melanoma
• Individuals with severe heart disease or recent heart attack
• People with kidney or liver disease (may require dose adjustments)

Your doctor will also consider your age, other medications, and overall health status before prescribing this treatment.

Levodopa Inhalation Brand Name

The brand name for levodopa inhalation is Inbrija, manufactured by Acorda Therapeutics. This is currently the only FDA-approved inhaled form of levodopa available in the United States.

Inbrija comes as a complete system that includes both the dry powder capsules and the specialized inhaler device. You cannot use the capsules with any other type of inhaler, and you cannot use other medications with the Inbrija inhaler device.

The medication is available only by prescription and is typically covered by most insurance plans for people with Parkinson's disease who meet the specific criteria for its use.

Levodopa Inhalation Alternatives

If levodopa inhalation isn't suitable for you, several other options exist for managing Parkinson's disease off episodes. Your doctor can help you explore these alternatives based on your specific needs and medical history.

Other fast-acting medications for off episodes include:

• Apomorphine injections (Apokyn) - works within 10-20 minutes
• Sublingual apomorphine strips (Kynmobi) - dissolves under your tongue
• Immediate-release oral levodopa/carbidopa - though slower than inhaled forms
• Adjusting your regular oral medication timing or dosage

These alternatives work through different delivery methods but aim to achieve the same goal of quickly restoring dopamine levels in your brain.

For some people, optimizing their regular oral medication regimen might be sufficient to reduce off episodes. This could involve switching to extended-release formulations, adding other Parkinson's medications like dopamine agonists, or adjusting meal timing to improve medication absorption.

Is Levodopa Inhalation Better Than Oral Levodopa?

Levodopa inhalation isn't necessarily better than oral levodopa, but it serves a different purpose in your overall treatment plan. The inhaled form is designed to complement your regular oral medications, not replace them entirely.

The main advantage of inhaled levodopa is speed. While oral levodopa typically takes 30-60 minutes to work, the inhaled form usually begins working within 10-15 minutes. This makes it particularly valuable for managing unexpected off episodes when you need quick relief.

However, oral levodopa remains the foundation of most Parkinson's treatment plans because it provides longer-lasting symptom control throughout the day. The inhaled form only works for about 1-2 hours, making it unsuitable as your primary medication.

Your doctor will help you determine the best combination of medications based on your symptom patterns, lifestyle, and how well you tolerate different treatments. Many people find that using both forms together provides the most comprehensive symptom management.