Ingrezza (Valbenazine): A Detailed Look at Dosage and Usage for Movement Disorders

Ingrezza, with the active ingredient valbenazine, is a prescription medication designed to manage specific movement disorders. It belongs to a class of drugs known as vesicular monoamine transporter type 2 (VMAT2) inhibitors. This article provides a comprehensive overview of Ingrezza dosage, strengths, and how to take it, tailored for an Indian audience seeking clear and practical information.

What is Ingrezza Used For?

Ingrezza is primarily prescribed to adults for the treatment of:

Tardive Dyskinesia (TD): This condition causes involuntary, repetitive body movements, often affecting the face, tongue, or limbs.
Chorea due to Huntington's Disease: Huntington's disease is a genetic disorder that leads to progressive breakdown of nerve cells in the brain, causing uncontrolled movements, emotional problems, and cognitive decline. Chorea refers to the jerky, involuntary movements associated with the condition.

How Ingrezza Works

Valbenazine works by affecting the levels of certain chemicals in the brain, specifically dopamine. By modulating these neurotransmitters, Ingrezza helps to reduce the involuntary movements associated with TD and chorea.

Ingrezza Dosage Forms and Strengths

Ingrezza is available in two forms:

Ingrezza Capsules: These are standard oral capsules that are swallowed whole.
Ingrezza Sprinkle Capsules: These capsules can be opened, and their contents sprinkled over soft food (like applesauce or pudding) for individuals who have difficulty swallowing pills.

Both forms come in three strengths:

40 mg
60 mg
80 mg

Your doctor will determine the most appropriate strength and dosage based on your specific condition, response to treatment, and overall health.

Starting and Maintenance Dosage

The treatment with Ingrezza typically involves a gradual dose increase to allow your body to adjust to the medication and minimize potential side effects.

For Tardive Dyskinesia (TD):

A common dosage regimen for TD is as follows:

Week 1: Starting dosage of 40 mg taken once daily.
After Week 1: The dosage is increased to a maintenance dosage, usually 80 mg taken once daily.

For Chorea due to Huntington's Disease:

The dosage regimen for chorea associated with Huntington's disease may differ slightly:

Week 1: Starting dosage of 40 mg taken once daily.
Weeks 2-4: The dosage is increased to 60 mg taken once daily.
After Week 4: The dosage is further increased to the maintenance dosage, typically 80 mg taken once daily.

Important Note: These are general guidelines. Your doctor will prescribe the exact dosage and titration schedule that is best for you. Always follow your doctor's instructions precisely.

Factors Influencing Dosage Adjustments

Your doctor may prescribe a lower maintenance dosage (40 mg or 60 mg per day) or adjust your current dose if:

You have certain pre-existing health conditions.
You are taking specific other medications that might interact with Ingrezza.
You experience side effects from Ingrezza.

Maximum Dosage

The maximum recommended daily dosage for both tardive dyskinesia and chorea due to Huntington's disease is 80 mg.

Long-Term Treatment

Ingrezza is often used as a long-term treatment. If your doctor finds it safe and effective for your condition, you may continue taking it for an extended period.

Understanding Liver Enzyme Interactions

Ingrezza is primarily metabolized (broken down) in the liver by specific enzymes, notably CYP2D6 and CYP3A4. If your liver enzymes do not function optimally, or if you are taking medications that affect these enzymes, the level of Ingrezza in your body could increase. This can raise the risk of side effects.

Your doctor will consider these factors and may lower your Ingrezza dosage if:

Your body naturally produces less of the CYP2D6 enzyme.
You are taking medications that inhibit (slow down) the activity of CYP3A4 or CYP2D6 liver enzymes.

It is crucial to inform your doctor about all the medications, supplements, and herbal products you are currently taking to avoid potential interactions.

What to Do in Case of an Overdose

If you suspect you have taken too much Ingrezza, contact your doctor immediately. You can also reach out to a poison control center for guidance. In India, you can contact the National Poisons Information Centre or your local emergency services. If you experience severe symptoms, call emergency services (like 108 or 112) or go to the nearest hospital emergency room without delay.

When to Consult a Doctor

It is essential to consult your doctor before starting Ingrezza and to discuss any concerns you may have regarding its dosage, side effects, or interactions. You should seek immediate medical attention if you experience:

Severe allergic reactions.
Unusual or worsening involuntary movements.
Any other concerning or severe side effects.

Always maintain open communication with your healthcare provider to ensure the safe and effective use of Ingrezza.

Disclaimer

This information is intended for educational purposes and should not be considered a substitute for professional medical advice. Always consult with a qualified healthcare provider for any health concerns or before making any decisions related to your health or treatment.