What is Dextromethorphan and Quinidine: Uses, Dosage, Side Effects and More

Dextromethorphan and quinidine is a prescription medication that combines two active ingredients to treat a specific neurological condition called pseudobulbar affect (PBA). This combination works differently than either medication would on its own, creating a unique treatment approach for people who experience sudden, uncontrollable episodes of laughing or crying that don't match how they actually feel inside.

If you or someone you care about has been prescribed this medication, you're likely dealing with a condition that can feel overwhelming and embarrassing. Understanding how this treatment works can help you feel more confident about your care plan and what to expect moving forward.

What is Dextromethorphan and Quinidine?

Dextromethorphan and quinidine is a prescription medication that combines two different drugs into one capsule. The brand name for this combination is Nuedexta, and it's specifically designed to treat pseudobulbar affect (PBA).

Dextromethorphan is a compound you might recognize from over-the-counter cough medicines, but in this combination, it serves a completely different purpose. Quinidine is a heart medication that's been used for decades to treat irregular heart rhythms. When these two medications are combined in specific doses, they work together to help control the brain pathways involved in emotional expression.

The combination is unique because quinidine actually helps dextromethorphan stay active in your body longer. Without quinidine, dextromethorphan would be broken down too quickly by your liver to be effective for PBA treatment.

What is Dextromethorphan and Quinidine Used For?

This medication is specifically approved to treat pseudobulbar affect (PBA), a neurological condition that causes sudden, uncontrollable episodes of laughing or crying. These episodes happen without warning and often don't match how you're actually feeling emotionally.

PBA typically develops in people who have certain neurological conditions or brain injuries. You might experience PBA if you have amyotrophic lateral sclerosis (ALS), multiple sclerosis (MS), Alzheimer's disease, Parkinson's disease, or if you've had a stroke or traumatic brain injury.

The episodes can feel embarrassing and distressing because they seem to come out of nowhere. You might find yourself crying uncontrollably during a happy moment, or laughing inappropriately during a serious conversation. These reactions can strain relationships and make social situations feel uncomfortable.

It's important to understand that PBA is different from depression or mood disorders. The emotional outbursts don't reflect your actual feelings, and they're caused by damage to the brain pathways that normally regulate emotional expression.

How Does Dextromethorphan and Quinidine Work?

This medication works by targeting specific brain pathways that control emotional expression. The combination is considered a moderately strong treatment that can significantly reduce PBA episodes when used consistently.

Dextromethorphan affects certain brain chemicals called neurotransmitters, particularly those involved in the brain circuits that regulate crying and laughing. It helps stabilize these pathways so they don't fire inappropriately.

Quinidine plays a supporting role by blocking an enzyme in your liver that normally breaks down dextromethorphan quickly. This allows the dextromethorphan to stay active in your system long enough to be effective for PBA treatment.

The medication doesn't cure the underlying neurological condition causing your PBA, but it can dramatically reduce the frequency and intensity of uncontrollable laughing or crying episodes. Many people notice improvements within the first few weeks of treatment.

How Should I Take Dextromethorphan and Quinidine?

You should take this medication exactly as your doctor prescribes, typically twice daily with or without food. The standard starting dose is usually one capsule every 12 hours, but your doctor might adjust this based on how you respond to treatment.

You can take the capsules with water, milk, or juice. There's no specific requirement to take them with food, but if you experience stomach upset, taking them with a light meal or snack might help.

Try to take your doses at the same times each day to maintain steady levels of the medication in your system. Setting phone reminders or using a pill organizer can help you stay consistent with your dosing schedule.

Don't crush, chew, or open the capsules. They're designed to release the medication in a specific way, and altering the capsule could affect how well the treatment works or increase your risk of side effects.

How Long Should I Take Dextromethorphan and Quinidine For?

The duration of treatment varies depending on your individual situation and how well you respond to the medication. Many people need to take it long-term to maintain control of their PBA symptoms.

Your doctor will likely want to see you regularly during the first few months of treatment to monitor how well the medication is working and check for any side effects. They might adjust your dose or timing based on your response.

Some people notice improvements in their PBA episodes within the first few weeks, while others might need several months to experience the full benefits. The key is to be patient and consistent with taking the medication as prescribed.

Never stop taking this medication suddenly without talking to your doctor first. They might want to gradually reduce your dose to prevent any potential withdrawal effects or return of PBA symptoms.

What Are the Side Effects of Dextromethorphan and Quinidine?

Like all medications, dextromethorphan and quinidine can cause side effects, though not everyone experiences them. Understanding what to expect can help you feel more prepared and know when to contact your healthcare provider.

The most common side effects are generally mild and often improve as your body adjusts to the medication over the first few weeks of treatment.

Common side effects you might experience include:

• Diarrhea or loose stools
• Dizziness or feeling lightheaded
• Nausea or stomach upset
• Swelling in your hands, feet, or ankles
• Weakness or fatigue
• Cough or respiratory symptoms
• Urinary tract infections

These common side effects are usually manageable and tend to lessen over time. However, you should contact your doctor if they become bothersome or interfere with your daily activities.

There are also some less common but more serious side effects that require immediate medical attention. While these are rare, it's important to be aware of them.

Serious side effects that need prompt medical care include:

• Heart rhythm problems or irregular heartbeat
• Severe dizziness or fainting
• Allergic reactions like rash, itching, or difficulty breathing
• Severe nausea, vomiting, or diarrhea
• Unusual bleeding or bruising
• Confusion or changes in mental state
• Severe muscle weakness

If you experience any of these serious side effects, contact your doctor immediately or seek emergency medical care. Your safety is the top priority, and healthcare providers are well-equipped to help manage any concerning symptoms.

Who Should Not Take Dextromethorphan and Quinidine?

This medication isn't safe for everyone, and your doctor will carefully review your medical history before prescribing it. Certain health conditions and medications can make this treatment inappropriate or dangerous.

You should not take this medication if you have certain heart conditions, particularly specific types of irregular heart rhythms or heart block. The quinidine component can affect your heart's electrical system, so your doctor will likely want to check your heart rhythm before starting treatment.

People with severe liver or kidney disease may not be able to take this medication safely. Your body needs healthy liver and kidney function to process the medication properly, and impaired organ function could lead to dangerous levels building up in your system.

If you're taking certain other medications, this combination might not be appropriate for you. This includes some antidepressants, blood thinners, and other heart medications that could interact dangerously with dextromethorphan and quinidine.

Your doctor will also need to know if you have a history of blood disorders, electrolyte imbalances, or if you're pregnant or planning to become pregnant. The safety of this medication during pregnancy hasn't been fully established.

Dextromethorphan and Quinidine Brand Name

The brand name for this combination medication is Nuedexta. This is the only FDA-approved brand of dextromethorphan and quinidine combination available in the United States.

Nuedexta is manufactured by Avanir Pharmaceuticals and comes in capsules containing 20 mg of dextromethorphan and 10 mg of quinidine. Each capsule is designed to provide the precise ratio of these two medications needed for effective PBA treatment.

You might sometimes see this medication referred to by its generic name, but currently, there are no generic versions available. This means you'll typically receive the brand-name Nuedexta when your prescription is filled.

The medication comes in bottles containing either 60 or 30 capsules, depending on your prescription and insurance coverage. Your pharmacist can help you understand your specific prescription and answer any questions about the medication you're receiving.

Dextromethorphan and Quinidine Alternatives

Currently, dextromethorphan and quinidine is the only FDA-approved medication specifically for treating pseudobulbar affect. However, your doctor might consider other approaches if this medication isn't suitable for you or doesn't provide adequate relief.

Some doctors might prescribe certain antidepressants off-label to help with PBA symptoms. Tricyclic antidepressants like amitriptyline or selective serotonin reuptake inhibitors (SSRIs) have shown some benefit in clinical studies, though they're not specifically approved for PBA treatment.

Non-medication approaches can also be helpful as complementary treatments. Speech therapy, counseling, and coping strategies can help you manage the social and emotional challenges that come with PBA episodes.

Working with a neurologist or psychiatrist who has experience with PBA can help you explore all available options. They can help you weigh the benefits and risks of different approaches based on your specific situation and other health conditions.

The most important thing is to work closely with your healthcare team to find the treatment approach that works best for you. Don't hesitate to ask questions or express concerns about your treatment plan.

Is Dextromethorphan and Quinidine Better Than Other PBA Treatments?

Dextromethorphan and quinidine is currently the gold standard treatment for pseudobulbar affect because it's the only medication specifically approved by the FDA for this condition. Clinical studies have shown it to be significantly more effective than placebo in reducing PBA episodes.

Compared to off-label treatments like antidepressants, this combination has been specifically studied and proven effective for PBA. The clinical trials showed that about 85% of people taking the medication experienced meaningful improvement in their PBA symptoms.

The advantage of having an FDA-approved treatment is that you can feel confident about its safety and effectiveness profile. The medication has undergone rigorous testing specifically for PBA, unlike other treatments that are used off-label.

However, "better" depends on your individual situation. Some people might respond well to alternative treatments, especially if they have other conditions that make dextromethorphan and quinidine inappropriate for them.

Your doctor can help you understand how this medication compares to other options based on your specific health profile, other medications you're taking, and your treatment goals.