Xadago 100mg Tablets

Manufacturer US WORLDMEDS Active Ingredient Safinamide(sa FIN a mide) Pronunciation sa-FIN-a-mide
It is used to treat "off" episodes (when a dose wears off) in people with Parkinson's disease.
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Drug Class
Antiparkinsonian agent
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Pharmacologic Class
Monoamine oxidase-B (MAO-B) inhibitor; Glutamate release modulator
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Pregnancy Category
C
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FDA Approved
Mar 2017
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DEA Schedule
Not Controlled

Overview

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What is this medicine?

Xadago (safinamide) is a medication used to treat Parkinson's disease. It helps to reduce 'off' times (periods when your Parkinson's symptoms return) in people who are already taking levodopa. It works by increasing the amount of dopamine in the brain and by affecting other brain chemicals.
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How to Use This Medicine

Taking Your Medication

To get the most benefit from your medication, follow your doctor's instructions carefully. Read all the information provided with your prescription and follow the instructions closely. Take your medication at the same time every day, with or without food, as directed by your doctor. Continue taking your medication as prescribed, even if you start to feel better.

Storing and Disposing of Your Medication

Store your medication at room temperature in a dry location, avoiding the bathroom. Keep all medications in a safe place, out of the reach of children and pets, to prevent accidental ingestion.

What to Do If You Miss a Dose

If you miss a dose, skip it and take your next dose at the usual time. Do not take two doses at the same time or take extra doses to make up for the missed dose.
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Lifestyle & Tips

  • Take Xadago once daily, with or without food.
  • Do not take Xadago with certain other medications, especially other MAOIs, certain pain medications (like meperidine, tramadol), certain antidepressants, and cold/allergy medicines containing pseudoephedrine or phenylephrine. Discuss all medications, supplements, and herbal products with your doctor.
  • Avoid foods high in tyramine (e.g., aged cheeses, cured meats, fermented foods, tap beer) if advised by your doctor, especially if you experience symptoms of a hypertensive crisis. While safinamide is selective for MAO-B, caution is still warranted.
  • Be aware of potential side effects such as dyskinesia (uncontrolled movements), nausea, falls, and insomnia. Report any new or worsening symptoms to your doctor.
  • Avoid driving or operating machinery until you know how Xadago affects you, as it can cause dizziness or sleepiness.
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Available Forms & Alternatives

Dosing & Administration

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Adult Dosing

Standard Dose: 50 mg orally once daily for the first two weeks, then may be increased to 100 mg orally once daily.
Dose Range: 50 - 100 mg

Condition-Specific Dosing:

adjunctive_therapy_parkinsons_off_episodes: Initiate with 50 mg once daily. After two weeks, the dose may be increased to 100 mg once daily based on individual patient need and tolerability. Administer with or without food.
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Pediatric Dosing

Neonatal: Not established
Infant: Not established
Child: Not established
Adolescent: Not established
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Dose Adjustments

Renal Impairment:

Mild: No dose adjustment required.
Moderate: No dose adjustment required.
Severe: Not studied; use is not recommended.
Dialysis: Not studied; use is not recommended.

Hepatic Impairment:

Mild: No dose adjustment required.
Moderate: Maximum dose of 50 mg once daily.
Severe: Contraindicated.

Pharmacology

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Mechanism of Action

Safinamide is a selective and reversible monoamine oxidase-B (MAO-B) inhibitor. It also modulates altered dopamine and glutamate activity by blocking voltage-dependent sodium channels and inhibiting glutamate release. The precise mechanism by which it exerts its therapeutic effects in Parkinson's disease is not fully understood but is thought to involve both MAO-B inhibition and non-dopaminergic mechanisms.
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Pharmacokinetics

Absorption:

Bioavailability: Approximately 95%
Tmax: 2-4 hours
FoodEffect: Food does not have a clinically significant effect on the pharmacokinetics of safinamide.

Distribution:

Vd: Approximately 165 L
ProteinBinding: Approximately 88-90%
CnssPenetration: Yes

Elimination:

HalfLife: 20-30 hours
Clearance: Approximately 3.4 L/h
ExcretionRoute: Primarily renal (urine), with a small amount in feces.
Unchanged: <10% (in urine)
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Pharmacodynamics

OnsetOfAction: Within 2 weeks (based on clinical trials showing efficacy at 2 weeks)
PeakEffect: Not precisely defined, but steady-state concentrations are reached within 1 week.
DurationOfAction: Once daily dosing suggests a prolonged duration of effect consistent with its half-life and irreversible MAO-B inhibition.

Safety & Warnings

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Side Effects

Urgent Side Effects: Seek Medical Help Right Away

Although rare, some people may experience severe and potentially life-threatening side effects while taking this medication. If you notice any of the following symptoms, contact your doctor or seek medical attention immediately:

Signs of an allergic reaction, such as:
+ Rash
+ Hives
+ Itching
+ Red, swollen, blistered, or peeling skin with or without fever
+ Wheezing
+ Tightness in the chest or throat
+ Trouble breathing, swallowing, or talking
+ Unusual hoarseness
+ Swelling of the mouth, face, lips, tongue, or throat
Signs of high blood pressure, including:
+ Severe headache
+ Dizziness
+ Passing out
+ Changes in eyesight
New or worsening trouble controlling body movements
Hallucinations (seeing or hearing things that are not there)
Changes in behavior
Feeling confused or agitated
Strong, uncontrollable urges (such as eating, gambling, sex, or spending money)
Changes in eyesight
Falls

Additionally, a severe and potentially life-threatening condition called serotonin syndrome may occur if you take this medication with certain other drugs. Seek medical help immediately if you experience:

Agitation
Changes in balance
Confusion
Hallucinations
Fever
Fast or abnormal heartbeat
Flushing
Muscle twitching or stiffness
Seizures
Shivering or shaking
Excessive sweating
Severe diarrhea
Upset stomach
Vomiting
Severe headache

Other Possible Side Effects

Like all medications, this drug may cause side effects. While many people experience no side effects or only minor ones, it's essential to discuss any concerns with your doctor. If you experience any of the following side effects or any other symptoms that bother you or do not go away, contact your doctor:

Upset stomach
Trouble sleeping

This is not an exhaustive list of possible side effects. If you have questions or concerns, contact your doctor. You can also report side effects to the FDA at 1-800-332-1088 or online at https://www.fda.gov/medwatch.
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Seek Immediate Medical Attention If You Experience:

  • Severe headache, blurred vision, chest pain, shortness of breath, confusion, or seizures (signs of hypertensive crisis)
  • Agitation, hallucinations, rapid heart rate, sweating, fever, muscle stiffness, twitching, or loss of coordination (signs of serotonin syndrome)
  • New or worsening uncontrolled movements (dyskinesia)
  • New or worsening hallucinations, delusions, or unusual thoughts
  • New or increased urges to gamble, increased sexual urges, uncontrolled spending, or binge eating (impulse control disorders)
  • Dizziness or lightheadedness when standing up (orthostatic hypotension)
  • Any changes in vision or eye pain
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Before Using This Medicine

Before Taking This Medication: Important Information to Share with Your Doctor

It is essential to inform your doctor about the following conditions and situations to ensure safe treatment:

Any allergies you have, including allergies to this medication, its components, or other substances. Be sure to describe the allergic reaction and its symptoms.
If you have liver disease, as this may affect the medication's safety and efficacy.
If you have taken certain medications for depression or Parkinson's disease within the last 14 days, including isocarboxazid, phenelzine, tranylcypromine, selegiline, or rasagiline, as this can increase the risk of very high blood pressure.
If you are currently taking linezolid or methylene blue, as these medications can interact with this drug.
If you are taking any other medications, including prescription and over-the-counter drugs, natural products, or vitamins, that may interact with this medication. This is especially important for medications used to treat cough or cold, depression or other mood problems, or pain, as some of these medications may be contraindicated with this drug.

Please note that this is not an exhaustive list of all potential interactions or health problems that may affect the safety and efficacy of this medication. To ensure your safety, it is crucial to:

Inform your doctor and pharmacist about all your medications, including prescription and over-the-counter drugs, natural products, and vitamins.
Discuss your health problems and medical history with your doctor.
Verify that it is safe to take this medication with all your other medications and health conditions.
* Do not start, stop, or change the dose of any medication without consulting your doctor.
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Precautions & Cautions

It is essential to inform all your healthcare providers, including doctors, nurses, pharmacists, and dentists, that you are taking this medication. Before engaging in activities that require alertness, such as driving, wait until you understand how this drug affects you.

Monitor your blood pressure regularly, as prescribed by your doctor, since this medication can cause high blood pressure. Certain foods and beverages, including cheese and red wine, may trigger a sudden and severe increase in blood pressure, which can be life-threatening. Discuss your risk with your doctor and obtain a list of foods and drinks to avoid during treatment and for a specified period after stopping the medication.

Be aware that some individuals have experienced sudden sleep episodes while performing daily activities like driving, eating, or conversing, even if they did not feel drowsy beforehand. These incidents have occurred up to 1 year after starting the medication. If you experience sudden sleep episodes, refrain from driving or engaging in activities that require alertness while taking this drug. Immediately contact your doctor if you fall asleep during activities or feel excessively sleepy.

Do not abruptly discontinue this medication without consulting your doctor, as this may increase your risk of side effects. If you need to stop taking this drug, your doctor will guide you on how to gradually taper off the medication.

Before consuming alcohol, marijuana, or other forms of cannabis, or taking prescription or over-the-counter medications that may impair your reactions, consult with your doctor. If you are pregnant, plan to become pregnant, or are breastfeeding, discuss the potential benefits and risks to you and your baby with your doctor.
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Overdose Information

Overdose Symptoms:

  • Hypertensive crisis
  • Serotonin syndrome
  • Severe dyskinesia
  • Psychiatric symptoms (e.g., hallucinations, psychosis)
  • Nausea, vomiting

What to Do:

In case of overdose, call your local poison control center (e.g., 1-800-222-1222 in the US) or seek emergency medical attention immediately. Treatment is supportive and symptomatic. There is no specific antidote.

Drug Interactions

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Contraindicated Interactions

  • Other monoamine oxidase inhibitors (MAOIs) (e.g., phenelzine, tranylcypromine, isocarboxazid, selegiline, rasagiline, linezolid, methylene blue)
  • Meperidine
  • Tramadol
  • Methadone
  • Propoxyphene
  • Cyclobenzaprine
  • St. John's Wort
  • Dextromethorphan
  • Sympathomimetics (e.g., pseudoephedrine, phenylephrine, ephedrine, amphetamines)
  • Triptans (e.g., sumatriptan, zolmitriptan)
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Major Interactions

  • Antidepressants (SSRIs, SNRIs, TCAs, bupropion) - risk of serotonin syndrome
  • Opioids (other than those contraindicated) - risk of serotonin syndrome
  • Dopaminergic agents (e.g., levodopa) - increased risk of dyskinesia
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Moderate Interactions

  • Drugs metabolized by BCRP (Breast Cancer Resistance Protein) or P-glycoprotein (P-gp) (e.g., rosuvastatin, digoxin) - safinamide is a weak inhibitor of BCRP and P-gp.

Monitoring

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Baseline Monitoring

Blood pressure

Rationale: MAO-B inhibitors can cause or exacerbate hypertension, especially with tyramine-containing foods or sympathomimetics.

Timing: Prior to initiation of therapy.

Ophthalmic examination

Rationale: Cases of serious retinal degeneration have been reported in animal studies; although not observed in human trials, caution is advised.

Timing: Consider prior to initiation, especially in patients with pre-existing retinal conditions.

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Routine Monitoring

Blood pressure

Frequency: Regularly, especially during dose titration and if symptoms of hypertension occur.

Target: Maintain within normal limits for the patient.

Action Threshold: Significant increase in blood pressure; consider dose adjustment or discontinuation.

Dyskinesia

Frequency: Regularly, especially after dose increase or initiation.

Target: Minimize severity and frequency.

Action Threshold: Worsening or new onset of severe dyskinesia; consider reducing levodopa dose or safinamide dose.

Mental status/Psychiatric symptoms

Frequency: Regularly.

Target: Maintain stable mood and cognitive function.

Action Threshold: New or worsening psychosis, hallucinations, impulse control disorders, or other psychiatric symptoms; consider dose adjustment or discontinuation.

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Symptom Monitoring

  • Hypertensive crisis (severe headache, blurred vision, chest pain, shortness of breath, confusion, seizures)
  • Serotonin syndrome (agitation, hallucinations, delirium, coma, tachycardia, labile blood pressure, dizziness, diaphoresis, flushing, hyperthermia, tremor, rigidity, myoclonus, hyperreflexia, incoordination, gastrointestinal symptoms)
  • New or worsening dyskinesia
  • Hallucinations or psychotic behavior
  • Impulse control/compulsive behaviors (e.g., gambling, hypersexuality, binge eating, compulsive shopping)
  • Orthostatic hypotension
  • Vision changes (e.g., blurred vision, eye pain)

Special Patient Groups

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Pregnancy

Pregnancy Category C. There are no adequate and well-controlled studies of safinamide in pregnant women. Animal studies have shown adverse developmental outcomes (e.g., skeletal malformations, reduced fetal weight) at doses higher than clinical exposure. Safinamide should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus.

Trimester-Specific Risks:

First Trimester: Potential for teratogenicity based on animal data.
Second Trimester: Potential for developmental toxicity based on animal data.
Third Trimester: Potential for developmental toxicity based on animal data.
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Lactation

It is not known whether safinamide or its metabolites are excreted in human milk. Because many drugs are excreted in human milk and because of the potential for serious adverse reactions in breastfed infants from safinamide, a decision should be made whether to discontinue nursing or to discontinue the drug, taking into account the importance of the drug to the mother.

Infant Risk: Risk unknown; potential for adverse effects due to MAO-B inhibition in the infant.
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Pediatric Use

The safety and effectiveness of safinamide in pediatric patients have not been established. Use is not recommended.

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Geriatric Use

No overall differences in safety or effectiveness were observed between patients 65 years and older and younger patients in clinical trials. No specific dose adjustment is required based on age, but older patients may be more sensitive to adverse effects.

Clinical Information

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Clinical Pearls

  • Xadago is indicated as adjunctive treatment to levodopa/carbidopa in patients with Parkinson's disease experiencing 'off' episodes.
  • It is not approved for monotherapy in Parkinson's disease.
  • Patients should be carefully monitored for the development or worsening of dyskinesia, especially after starting Xadago or increasing the dose, as levodopa dose adjustment may be necessary.
  • Counsel patients on the risk of serotonin syndrome and hypertensive crisis, emphasizing the importance of avoiding contraindicated medications and certain foods (if advised).
  • Impulse control disorders can occur; patients and caregivers should be advised to monitor for new or increased compulsive behaviors.
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Alternative Therapies

  • Other MAO-B inhibitors (e.g., rasagiline, selegiline)
  • COMT inhibitors (e.g., entacapone, opicapone, tolcapone)
  • Dopamine agonists (e.g., pramipexole, ropinirole, rotigotine)
  • Amantadine (for dyskinesia or 'off' time)
  • Istradefylline (adenosine A2A receptor antagonist)
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Cost & Coverage

Average Cost: Typically high, ranging from $1000-$2000+ per 30 tablets
Insurance Coverage: Specialty Tier (requires prior authorization, step therapy)
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General Drug Facts

If your symptoms or health issues persist or worsen, it's essential to contact your doctor for further guidance. To ensure your safety, never share your medication with others or take someone else's medication. Some medications may come with an additional patient information leaflet, so be sure to check with your pharmacist for more information. If you have any questions or concerns about your medication, don't hesitate to reach out to your doctor, nurse, pharmacist, or other healthcare provider. In the event of a suspected overdose, immediately call your local poison control center or seek medical attention. When seeking help, be prepared to provide details about the medication taken, the amount, and the time it happened.