What is Elacestrant: Uses, Dosage, Side Effects and More

Elacestrant is a targeted cancer medication that belongs to a newer class of drugs called selective estrogen receptor degraders (SERDs). It's specifically designed to treat certain types of advanced breast cancer that depend on estrogen to grow.

This oral medication works by blocking estrogen receptors in cancer cells, essentially cutting off their fuel supply. Think of it as turning off a switch that cancer cells need to multiply and spread throughout your body.

What is Elacestrant Used For?

Elacestrant is primarily used to treat advanced or metastatic breast cancer in postmenopausal women and men. The cancer must be both estrogen receptor-positive (ER+) and HER2-negative, meaning it grows in response to estrogen but doesn't overexpress the HER2 protein.

Your doctor will typically prescribe this medication when your cancer has progressed despite treatment with other hormone therapies. It's particularly effective for cancers that have developed resistance to previous treatments like aromatase inhibitors or fulvestrant.

The medication is also used when your cancer has specific genetic mutations, particularly in the ESR1 gene. These mutations can make cancer cells resistant to other hormone therapies, but elacestrant is designed to overcome this resistance.

How Does Elacestrant Work?

Elacestrant works by directly targeting and destroying estrogen receptors in cancer cells. Unlike some other hormone therapies that simply block estrogen, this medication actually breaks down the receptors themselves.

When elacestrant binds to estrogen receptors, it causes them to change shape and become unstable. Your body then recognizes these damaged receptors as waste and removes them completely from the cancer cells.

This dual action makes elacestrant particularly effective against cancer cells that have become resistant to other treatments. It's considered a moderately strong medication that can slow or stop cancer growth when other options have failed.

How Should I Take Elacestrant?

Elacestrant comes as oral tablets that you take once daily with food. Taking it with a meal helps your body absorb the medication more effectively and can reduce stomach upset.

You should take your dose at the same time each day to maintain consistent levels in your bloodstream. Swallow the tablets whole with water - don't crush, chew, or break them as this can affect how the medication works.

It's best to take elacestrant with a moderate-fat meal rather than on an empty stomach. Foods like toast with butter, yogurt, or a light sandwich work well. Avoid grapefruit and grapefruit juice, as these can interfere with how your body processes the medication.

If you vomit within 4 hours of taking your dose, you may take another dose. However, if more than 4 hours have passed, wait until your next scheduled dose rather than doubling up.

How Long Should I Take Elacestrant For?

You'll typically continue taking elacestrant for as long as it's effectively controlling your cancer and you're tolerating it well. This could be months or even years, depending on how your body responds to treatment.

Your doctor will monitor your progress through regular blood tests, imaging scans, and physical examinations. These check-ups help determine whether the medication is working and whether any side effects are manageable.

The decision to stop elacestrant usually comes when your cancer progresses despite treatment or when side effects become too difficult to manage. Your healthcare team will work with you to find the right balance between cancer control and quality of life.

What Are the Side Effects of Elacestrant?

Like all cancer medications, elacestrant can cause side effects, though not everyone experiences them. Most side effects are manageable with proper care and monitoring from your healthcare team.

Here are the most common side effects you might experience:

• Nausea and vomiting
• Fatigue or feeling unusually tired
• Decreased appetite
• Diarrhea or changes in bowel movements
• Muscle and joint pain
• Hot flashes
• Headaches
• Changes in cholesterol levels

These common side effects usually improve as your body adjusts to the medication. Your doctor can recommend strategies to help manage them, such as anti-nausea medications or dietary changes.

Some less common but more serious side effects require immediate medical attention:

• Severe liver problems (yellowing of skin or eyes, dark urine, severe stomach pain)
• Blood clots (sudden chest pain, shortness of breath, leg swelling)
• Severe allergic reactions (rash, difficulty breathing, swelling of face or throat)
• Heart rhythm changes (irregular heartbeat, dizziness, fainting)
• Severe dehydration from persistent vomiting or diarrhea

While these serious side effects are rare, it's important to contact your healthcare provider immediately if you experience any of these symptoms.

Who Should Not Take Elacestrant?

Elacestrant isn't suitable for everyone, and your doctor will carefully review your medical history before prescribing it. You should not take this medication if you're allergic to elacestrant or any of its ingredients.

Women who are pregnant or might become pregnant should not take elacestrant, as it can harm an unborn baby. If you're of childbearing age, you'll need to use effective birth control during treatment and for one week after your last dose.

People with severe liver disease may not be able to take elacestrant safely, as the medication is processed through the liver. Your doctor will check your liver function before starting treatment and monitor it regularly.

If you're taking certain medications that interact with elacestrant, your doctor may need to adjust doses or choose alternative treatments. This includes some seizure medications, antibiotics, and antifungal drugs.

Elacestrant Brand Names

Elacestrant is available under the brand name Orserdu in the United States. This is currently the only FDA-approved brand name for this medication.

The generic name "elacestrant" refers to the active ingredient, while Orserdu is the specific brand manufactured by Menarini Group. Your prescription and insurance coverage will typically use the brand name Orserdu.

Elacestrant Alternatives

If elacestrant isn't suitable for you or stops working effectively, several alternative treatments are available for hormone receptor-positive breast cancer. Your doctor will help determine the best option based on your specific situation.

Other selective estrogen receptor degraders include fulvestrant (Faslodx), which is given as an injection. CDK4/6 inhibitors like palbociclib (Ibrance), ribociclib (Kisqali), or abemaciclib (Verzenio) are often combined with hormone therapy.

Aromatase inhibitors such as letrozole (Femara), anastrozole (Arimidex), or exemestane (Aromasin) may be options if you haven't used them before. For some patients, chemotherapy or targeted therapies like everolimus (Afinitor) might be recommended.

The choice of alternative depends on your previous treatments, genetic markers of your cancer, and your overall health status.

Is Elacestrant Better Than Fulvestrant?

Elacestrant and fulvestrant are both selective estrogen receptor degraders, but they have important differences that make each suitable for different situations. Elacestrant's main advantage is that it's taken orally, while fulvestrant requires monthly injections.

Clinical studies suggest that elacestrant may be more effective than fulvestrant in cancers with ESR1 mutations, which are genetic changes that make cancer resistant to other hormone therapies. This makes elacestrant particularly valuable for previously treated patients.

However, fulvestrant has been used longer and has more extensive safety data. Some patients may tolerate one medication better than the other. Your doctor will consider your specific cancer characteristics, treatment history, and personal preferences when choosing between them.

Neither medication is universally "better" - the best choice depends on your individual circumstances and how your cancer responds to treatment.