Administration:

• Exondys 51 is administered by a healthcare professional in a clinical setting.
  
  
• The medication is given through an IV line. The dosage is adjusted according to body weight, and the infusion typically takes about 35-60 minutes to complete.
  
  
• Pre-medication: Some patients may be given medications to prevent allergic reactions or discomfort during the infusion.
  
  

Precautions:

• Monitor for Infusion Reactions: Healthcare professionals should monitor patients during the infusion for signs of an allergic or infusion-related reaction, such as fever, rash, or swelling.
  
  
• Hydration: It is essential to stay well-hydrated before and after the infusion to help minimize the risk of side effects.
  
  
• Post-Infusion Monitoring: After receiving an infusion, patients should be observed for a period of time for any immediate reactions or complications.
  
  

Duration of Treatment:

Exondys 51 is typically used as a long-term treatment, often continuing for months or years. Regular infusions will be part of ongoing care, with continuous monitoring by healthcare professionals to assess the drug’s effectiveness and to manage any side effects.

Exondys 51 works by skipping exon 51 in the dystrophin gene during the process of mRNA splicing. In individuals with DMD, the dystrophin gene is mutated, and this mutation typically prevents the production of the full, functional dystrophin protein, which is necessary for maintaining muscle cell integrity.

By using eteplirsen to skip exon 51, the body can produce a truncated version of dystrophin, one that is shorter but still functional enough to help stabilize the muscle cell membrane and reduce muscle damage. While this version of dystrophin is not perfect, it can partially restore muscle function, helping slow the progression of muscle weakness in those with DMD who have the exon 51 mutation.

Exondys 51 is specifically effective for patients who have a genetic mutation amenable to exon 51 skipping, which occurs in approximately 13-15% of boys with DMD. This makes it a targeted therapy, and its success depends on the genetic profile of the individual.

Common Side Effects:

• Infusion-Related Reactions: Some patients may experience side effects related to the infusion, such as:
  
  
  • Fever
    
    
  • Rash
    
    
  • Chills
    
    
  • Headache
    
    
• These side effects are typically mild and subside after the infusion is completed or with supportive care.
  
  

Serious Side Effects:

• Kidney Problems: There is a potential risk of kidney-related side effects, especially if there is an existing kidney condition. Regular kidney function monitoring is required during treatment.
  
  
• Allergic Reactions: Rare but severe allergic reactions to the medication, such as difficulty breathing, swelling of the face or throat, or severe rash, may occur and require immediate medical attention.
  
  
• Respiratory Issues: Some patients may develop breathing difficulties, which should be addressed immediately.
  
  
• Injection Site Reactions: Some individuals may experience pain, redness, or swelling at the infusion site.
  
  

If any of these side effects occur, medical attention should be sought promptly.

• Kidney Function Monitoring: Exondys 51 can impact kidney function, so regular kidney function tests, including serum creatinine and glomerular filtration rate (GFR), are required throughout treatment.
  
  
• Allergic Reactions: Exondys 51 has the potential to cause serious allergic reactions. Healthcare providers will monitor for signs of anaphylaxis during and after the infusion.
  
  
• Pregnancy and Breastfeeding: The effects of Exondys 51 on pregnant women and breastfeeding mothers are unknown. It is essential to discuss with a healthcare provider before starting Exondys 51 if pregnant or planning pregnancy.
  
  
• Children: Exondys 51 is specifically used in children with DMD who have the appropriate genetic mutation. It is not intended for use in children without the mutation targeted by the drug.
  
  

Patients receiving Exondys 51 should be monitored regularly for any adverse effects or complications.

• Vaccines: Some live vaccines should be avoided during Exondys 51 treatment as they may interact with the medication, leading to potential side effects. Discuss all vaccines with your healthcare provider.
  
  
• Other Medications: Although Exondys 51 does not typically interact with other medications, it is essential to inform your doctor about all other drugs, supplements, or treatments being used, including corticosteroids and physical therapy regimens, as these are commonly part of DMD management.
  
  
• Infusion-related Reactions: If patients experience side effects like fever, chills, or rash during the infusion, these should be reported to a healthcare provider. Monitoring during infusions may be required.
  
  

Always inform your healthcare provider about all medications you are using to avoid potential interactions.

• General Dosage:
  
  
  • For patients with DMD: The typical dose is 30 mg/kg body weight administered once a week via intravenous infusion.
    
    
  • The infusion time generally ranges from 35 to 60 minutes.
    
    
  • Treatment should continue as long as the medication is effective and no significant side effects occur.
    
    
• Missed Dose: If a dose is missed, patients should contact their healthcare provider to arrange for rescheduling the next infusion.
  
  

Duration: Exondys 51 is used as a long-term treatment, with regular infusions typically continuing for several months to years. Patients will receive ongoing assessments of effectiveness and tolerance.

Exondys 51 is a prescription-only medication, meaning it requires a healthcare provider’s approval before use. It is available only in specialized treatment centers or hospitals that can administer IV infusions. Regular monitoring and follow-up visits with healthcare professionals are essential throughout the course of treatment.

Before beginning Exondys 51, patients must undergo genetic testing to confirm that they have the specific mutation that is amenable to exon 51 skipping. It is essential to follow the prescribed dosage and treatment schedule to maximize the benefits of the medication while minimizing the risk of side effects.

• What is Exondys 51 used for?
  It is prescribed to treat Duchenne muscular dystrophy (DMD) in patients who have a confirmed mutation of the DMD gene amenable to exon 51 skipping.

• What is the active ingredient?
  Eteplirsen, an antisense oligonucleotide.

• How does Exondys 51 work?
  It promotes exon 51 skipping during gene transcription, allowing the body to produce a shortened but functional form of dystrophin protein, which is lacking in DMD patients.

• Does Exondys 51 cure Duchenne muscular dystrophy?
  No, it does not cure DMD but may slow disease progression by partially restoring dystrophin production.

• How is Exondys 51 given?
  It is administered as an intravenous (IV) infusion once weekly.

• How long is each infusion?
  Typically infused over 35–60 minutes, under medical supervision.

• Who is eligible for Exondys 51?
  Patients with a specific genetic mutation of the DMD gene amenable to exon 51 skipping (about 13% of DMD patients).

• What are the common side effects?
  Cough, cold symptoms, fever, rash, joint pain, and skin irritation at the injection site.

• Are there serious side effects?
  Rare, but include allergic reactions, kidney problems, and infusion-related reactions.

• Is kidney monitoring required?
  Yes, kidney function (urine tests and blood tests) must be monitored regularly.

• Is Exondys 51 safe for children?
  Yes, it is approved for pediatric patients, but dosing is weight-based.

• Is it approved for adults?
  It is primarily studied in children and adolescents but may be prescribed to adults with the eligible mutation.

• How effective is Exondys 51?
  It has been shown to increase dystrophin levels in muscle, though long-term functional outcomes are still being studied.

• Is it safe during pregnancy?
  Safety in pregnancy has not been established—consult a doctor if pregnancy is possible.

• Can it be used while breastfeeding?
  Unknown if it passes into breast milk—consult a doctor before use.

• Does Exondys 51 interact with other medications?
  No major drug interactions are known, but patients should inform doctors of all medications.

• How long will patients need Exondys 51?
  It is usually a long-term, ongoing therapy for eligible DMD patients.

• Is genetic testing required before use?
  Yes, genetic confirmation of an exon 51-skippable mutation is necessary.

• Where is Exondys 51 available?
  Available at specialty pharmacies and infusion centers with a prescription.