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

Enasidenib is a targeted cancer medication that treats a specific type of blood cancer called acute myeloid leukemia (AML). This oral medication works by blocking a mutated protein that helps cancer cells grow and survive.

If you or someone you care about has been prescribed enasidenib, you likely have questions about how it works and what to expect. This medication represents a significant breakthrough in personalized cancer treatment, offering hope for patients whose cancer has a specific genetic change.

What is Enasidenib?

Enasidenib is a prescription medication that belongs to a class of drugs called IDH2 inhibitors. It specifically targets cancer cells that have a mutation in the IDH2 gene, which is found in about 10-15% of people with acute myeloid leukemia.

This medication comes as an oral tablet, making it more convenient than many traditional cancer treatments that require hospital visits for infusions. The drug received FDA approval in 2017 after showing promising results in clinical trials.

What makes enasidenib special is its precision approach. Rather than attacking all rapidly dividing cells like traditional chemotherapy, it specifically targets the faulty protein produced by the mutated IDH2 gene.

What is Enasidenib Used For?

Enasidenib is primarily used to treat acute myeloid leukemia (AML) in adults whose cancer has an IDH2 mutation. Your doctor will test your cancer cells to confirm this specific genetic change before prescribing this medication.

The medication is typically prescribed for patients whose AML has returned after previous treatment or hasn't responded well to other therapies. It's considered a second-line treatment option, meaning it's used when first-line treatments haven't been successful.

In some cases, your oncologist might recommend enasidenab as part of a combination therapy approach. This means using it alongside other cancer medications to potentially improve treatment outcomes.

How Does Enasidenib Work?

Enasidenib works by blocking the abnormal IDH2 protein that cancer cells need to survive and multiply. This protein normally helps cells produce energy, but when it's mutated, it creates substances that prevent healthy blood cells from developing properly.

Think of the mutated IDH2 protein as a broken factory machine that's producing the wrong products. Enasidenib acts like a skilled technician who shuts down this faulty machine, allowing the cell's normal processes to resume.

This medication is considered moderately strong in terms of cancer treatments. While it's generally better tolerated than traditional chemotherapy, it still requires careful monitoring and can cause significant side effects.

The drug doesn't work immediately. It often takes several weeks or months to see improvements in blood counts and overall response to treatment.

How Should I Take Enasidenib?

Take enasidenib exactly as your doctor prescribes, typically once daily at the same time each day. You can take it with or without food, but try to be consistent with your choice to maintain steady levels in your body.

Swallow the tablet whole with a full glass of water. Don't crush, chew, or break the tablet, as this can affect how the medication is absorbed into your system.

If you have trouble swallowing pills, talk to your healthcare team about strategies that might help. They may suggest taking the medication with a small amount of soft food like applesauce or yogurt.

It's perfectly fine to take enasidenib on an empty stomach if that's more convenient for you. However, if you experience stomach upset, taking it with a light meal or snack might help reduce nausea.

How Long Should I Take Enasidenib For?

The duration of enasidenib treatment varies significantly from person to person and depends on how well your cancer responds to the medication. Some patients may take it for several months, while others might continue treatment for years.

Your oncologist will monitor your blood counts and overall health regularly to determine if the medication is working effectively. Treatment typically continues as long as your cancer is responding and you're tolerating the side effects reasonably well.

If your cancer stops responding to enasidenib or if you develop serious side effects, your doctor will discuss alternative treatment options with you. Never stop taking this medication without first consulting your healthcare team.

Regular follow-up appointments are crucial during treatment. These visits allow your medical team to track your progress and make any necessary adjustments to your treatment plan.

What Are the Side Effects of Enasidenib?

Like all cancer medications, enasidenib can cause side effects, though not everyone experiences them. Most side effects are manageable with proper medical support and monitoring.

Here are the most common side effects you might experience during treatment:

• Nausea and decreased appetite
• Fatigue and weakness
• Diarrhea or changes in bowel movements
• Elevated liver enzyme levels
• Low white blood cell counts
• Muscle or joint pain

These common side effects usually develop gradually and can often be managed with supportive care medications or dietary adjustments.

Some patients may experience more serious but less common side effects that require immediate medical attention:

• Differentiation syndrome (fever, difficulty breathing, fluid retention)
• Severe liver problems
• Serious infections due to low white blood cell counts
• Unusual bleeding or bruising
• Severe fatigue or weakness

Differentiation syndrome is a rare but potentially serious condition that can occur when cancer cells die rapidly. Your healthcare team will monitor you closely for signs of this condition, especially during the first few months of treatment.

Who Should Not Take Enasidenib?

Enasidenib isn't suitable for everyone, and your doctor will carefully evaluate whether it's the right choice for your specific situation. People with certain health conditions may not be able to take this medication safely.

You should not take enasidenib if you have a known allergy to the medication or any of its ingredients. Your doctor will review your allergy history before prescribing this treatment.

Certain medical conditions require extra caution or may prevent you from taking enasidenib safely:

• Severe liver disease or significantly elevated liver enzymes
• Active, uncontrolled infections
• Severe kidney problems
• Pregnancy or breastfeeding
• Certain heart conditions

If you're pregnant or planning to become pregnant, it's crucial to discuss this with your healthcare team. Enasidenib can harm an unborn baby, so effective contraception is essential during treatment and for some time after stopping the medication.

Your doctor will also review all other medications you're taking to check for potential interactions that could affect how enasidenib works or increase your risk of side effects.

Enasidenib Brand Name

Enasidenib is sold under the brand name Idhifa in the United States and many other countries. This is the only brand name currently available for this medication.

When you pick up your prescription, you'll see "Idhifa" on the bottle label along with the generic name "enasidenib." Both names refer to the same medication, so don't worry if you see either one used in your medical records or by your healthcare team.

Currently, there are no generic versions of enasidenib available, as the medication is still relatively new and under patent protection.

Enasidenib Alternatives

If enasidenib isn't suitable for you or stops working effectively, your oncologist has several alternative treatment options to consider. The best choice depends on your specific situation, overall health, and how your cancer has responded to previous treatments.

Other targeted therapies for AML include ivosidenib (Tibsovo) for patients with IDH1 mutations, and various FLT3 inhibitors like midostaurin or gilteritinib for patients with FLT3 mutations.

Traditional chemotherapy combinations remain important treatment options, particularly for patients who are healthy enough to tolerate more intensive therapy. These might include combinations like cytarabine with daunorubicin or other established regimens.

For some patients, clinical trials investigating new treatments might be an excellent option. Your oncologist can help you explore whether any current research studies might be appropriate for your situation.

Is Enasidenib Better Than Azacitidine?

Comparing enasidenib to azacitidine isn't straightforward because they work in different ways and are used for different patient populations. Enasidenib is specifically for patients with IDH2 mutations, while azacitidine is used more broadly for various blood cancers.

For patients with IDH2-mutated AML, enasidenib has shown promising results in clinical trials, with many patients achieving remission or stable disease. However, azacitidine combined with other drugs has also shown effectiveness in older patients or those who can't tolerate intensive chemotherapy.

The "better" choice depends entirely on your specific situation. Factors like your age, overall health, genetic makeup of your cancer, and previous treatments all play important roles in determining the most appropriate therapy.

Your oncologist will consider all these factors when recommending treatment. Sometimes, patients might receive both medications at different times during their treatment journey.