Etelcalcetide: A Comprehensive Guide for Patients

What is Etelcalcetide?

Etelcalcetide is a medication used to treat a condition called secondary hyperparathyroidism in patients with chronic kidney disease who are on hemodialysis. It is also known by its brand name Parsabiv™ and was previously referred to as AMG 416 or KAI-4169 during its development13. This drug is designed to help control the levels of certain minerals in your body, which can become imbalanced when your kidneys are not functioning properly.

What Conditions Does Etelcalcetide Treat?

Etelcalcetide is primarily used to treat secondary hyperparathyroidism (SHPT) in patients with chronic kidney disease (CKD) who are receiving hemodialysis1. Let's break down these terms:

• Secondary Hyperparathyroidism (SHPT): This is a condition where the parathyroid glands produce too much parathyroid hormone (PTH). It often occurs as a result of chronic kidney disease.
• Chronic Kidney Disease (CKD): This is a long-term condition where the kidneys don't work as well as they should. When kidneys are damaged, they can't properly regulate minerals in the body, leading to SHPT.
• Hemodialysis: This is a treatment for kidney failure where a machine filters waste and excess fluids from your blood, performing the job that healthy kidneys would normally do.

Etelcalcetide is specifically used in patients with CKD who are on hemodialysis and have developed SHPT as a complication2. It helps manage the mineral and bone disorder associated with CKD, which can lead to serious complications if left untreated.

How Does Etelcalcetide Work?

Etelcalcetide works by mimicking the action of calcium in your body. It's known as a calcimimetic, which means it binds to and activates the calcium-sensing receptors in the parathyroid glands3. Here's how it helps:

• It tricks the parathyroid glands into thinking there's more calcium in the blood than there actually is.
• This causes the glands to reduce their production of parathyroid hormone (PTH).
• By lowering PTH levels, it helps to control the balance of calcium and phosphorus in your body.
• This can help prevent complications like bone disease and the buildup of calcium in blood vessels and other tissues.

By controlling these mineral levels, etelcalcetide helps to manage the symptoms and potential complications of secondary hyperparathyroidism in CKD patients4.

How is Etelcalcetide Administered?

Etelcalcetide is given in a unique way compared to many other medications:

• It is administered as an intravenous (IV) injection.
• The injection is given at the end of each hemodialysis session, typically three times per week.
• It's injected into the venous line of the dialysis circuit, which means it goes directly into your bloodstream1.
• The starting dose is usually 5 mg, but this can be adjusted by your doctor based on your response to the treatment10.
• The maximum dose is typically 15 mg three times per week2.

Your healthcare provider will determine the right dose for you based on your PTH and calcium levels. They will monitor these levels regularly and adjust your dose as needed9.

Effectiveness of Etelcalcetide

Clinical trials have shown that etelcalcetide is effective in treating secondary hyperparathyroidism in patients with chronic kidney disease on hemodialysis. Here are some key findings:

• Many patients experience a significant reduction in PTH levels after starting treatment with etelcalcetide10.
• In one study, a high percentage of patients achieved at least a 30% reduction in PTH levels from baseline8.
• Etelcalcetide has been shown to help control not only PTH levels, but also calcium and phosphorus levels in the blood9.
• The effects of etelcalcetide appear to be maintained over long-term treatment, with studies following patients for up to 52 weeks10.

It's important to note that individual responses to the medication can vary. Your healthcare provider will monitor your progress closely to ensure the treatment is working effectively for you.

Potential Side Effects

Like all medications, etelcalcetide can cause side effects. Some of the most common side effects reported in clinical trials include:

• Decreased calcium levels (hypocalcemia): This is one of the most important side effects to be aware of. Your doctor will monitor your calcium levels closely3.
• Muscle spasms
• Diarrhea
• Nausea
• Vomiting
• Headache
• Low blood pressure

In some cases, more serious side effects can occur. These may include severe hypocalcemia, worsening heart failure, or allergic reactions. It's crucial to report any unusual symptoms to your healthcare provider immediately5.

Use in Special Populations

While etelcalcetide is primarily used in adult patients, research is ongoing to understand its use in special populations:

• Pediatric Patients: Clinical trials are being conducted to evaluate the safety and effectiveness of etelcalcetide in children and adolescents with CKD on hemodialysis67.
• Elderly Patients: The medication has been studied in older adults, but as with any medication, dosing may need to be adjusted based on individual factors.
• Patients with Liver Problems: No dose adjustment is typically needed for patients with mild to moderate liver impairment, but caution is advised in patients with severe liver disease.

Always inform your healthcare provider about all your medical conditions and medications to ensure etelcalcetide is safe and appropriate for you.

Ongoing Research

Researchers continue to study etelcalcetide to better understand its long-term effects and potential benefits. Some areas of ongoing research include:

• The impact of etelcalcetide on bone health and the risk of fractures in CKD patients4.
• Its effect on vascular calcification (the buildup of calcium in blood vessels)4.
• The use of etelcalcetide in pediatric patients with SHPT8.
• Long-term safety and efficacy studies to understand the effects of the medication over extended periods10.

These ongoing studies will help healthcare providers better understand how to use etelcalcetide most effectively and safely in different patient populations.