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

Erdafitinib is a targeted cancer medication that blocks specific proteins that help cancer cells grow and spread. It's specifically designed to treat certain types of bladder cancer that have particular genetic changes, making it a precision medicine approach to cancer treatment.

This medication represents a newer generation of cancer treatments that work differently from traditional chemotherapy. Instead of affecting all rapidly dividing cells, erdafitinib targets specific pathways that cancer cells depend on for survival.

What is Erdafitinib?

Erdafitinib is an oral cancer medication that belongs to a class of drugs called tyrosine kinase inhibitors. It works by blocking proteins called fibroblast growth factor receptors (FGFR) that can fuel cancer growth when they become overactive.

The medication comes as tablets that you take by mouth, making it more convenient than intravenous cancer treatments. It's been specifically developed for people whose cancer has genetic alterations in FGFR genes, which your doctor can identify through genetic testing of your tumor.

What is Erdafitinib Used For?

Erdafitinib is primarily used to treat advanced bladder cancer that has spread to other parts of the body. Specifically, it's prescribed for patients whose cancer has genetic changes in fibroblast growth factor receptor (FGFR) genes and who have already tried other treatments.

Your doctor will only prescribe this medication if your cancer tests positive for specific FGFR genetic alterations. This testing ensures that you're likely to benefit from this targeted approach, as the medication works best in cancers with these particular genetic characteristics.

The medication is typically considered when other standard treatments haven't worked or have stopped working effectively. It's part of what doctors call "precision medicine" because it targets the specific genetic drivers of your particular cancer.

How Does Erdafitinib Work?

Erdafitinib works by blocking fibroblast growth factor receptors (FGFR) that cancer cells use to grow and spread. Think of these receptors as switches that, when turned on, tell cancer cells to multiply and create new blood vessels to feed the tumor.

When FGFR genes are altered in cancer, these switches get stuck in the "on" position, causing uncontrolled cell growth. Erdafitinib acts like a key that fits into these switches and turns them off, slowing down or stopping cancer progression.

This medication is considered a moderately strong targeted therapy. While it's generally better tolerated than traditional chemotherapy, it can still cause significant side effects because it affects normal cells that also use FGFR pathways.

How Should I Take Erdafitinib?

Take erdafitinib exactly as your doctor prescribes, typically once daily on an empty stomach. You should take it at least one hour before eating or two hours after eating, as food can affect how well your body absorbs the medication.

Swallow the tablets whole with a full glass of water. Don't crush, chew, or split the tablets, as this can affect how the medication is released in your body. Try to take your dose at the same time each day to maintain steady levels in your bloodstream.

Your doctor will likely start you on a specific dose and may adjust it based on how well you tolerate the medication and how your cancer responds. Regular blood tests will help your healthcare team monitor your response and watch for side effects.

How Long Should I Take Erdafitinib For?

You'll typically continue taking erdafitinib as long as it's helping control your cancer and you're tolerating it reasonably well. Unlike some medications with set treatment durations, targeted cancer therapies like erdafitinib are often taken indefinitely.

Your doctor will regularly evaluate your response through scans and blood tests, usually every few months. If your cancer progresses despite treatment or if you develop serious side effects, your doctor may recommend stopping the medication or switching to a different treatment.

Some people take erdafitinib for many months or even years, while others may need to stop sooner due to side effects or cancer progression. Your individual response will guide how long you continue treatment.

What Are the Side Effects of Erdafitinib?

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

Here are the more common side effects you might experience while taking erdafitinib:

• Mouth sores or dry mouth
• Diarrhea or changes in bowel movements
• Fatigue or feeling more tired than usual
• Nail changes, including nail loss or infection
• Skin rash or dry skin
• Eye problems, including dry eyes or blurred vision
• Changes in taste
• Decreased appetite
• Hair thinning

Your doctor will monitor you closely for these effects and can provide treatments to help manage them. Many side effects improve as your body adjusts to the medication.

While less common, some people may experience more serious side effects that require immediate medical attention:

• Severe eye problems, including vision changes or eye pain
• Signs of kidney problems, such as decreased urination or swelling
• Severe skin reactions
• Unusual bleeding or bruising
• Signs of infection, including fever or persistent sore throat
• Severe diarrhea that doesn't improve
• Heart rhythm changes

These serious side effects are rare, but it's important to contact your healthcare team immediately if you notice any of these symptoms. Quick intervention can often prevent complications.

Who Should Not Take Erdafitinib?

Erdafitinib isn't suitable for everyone, and your doctor will carefully evaluate whether it's right for you. People with certain health conditions or circumstances may not be good candidates for this medication.

Your doctor will likely recommend against erdafitinib if you have:

• Severe kidney problems
• Serious eye disorders or vision problems
• Current pregnancy or plans to become pregnant
• Breastfeeding
• Severe liver disease
• Known allergies to erdafitinib or its ingredients

Additionally, erdafitinib may not be appropriate if you're taking certain medications that could interact dangerously with it. Your doctor will review all your current medications before prescribing this treatment.

Age alone isn't typically a barrier to treatment, but your overall health status and ability to tolerate potential side effects will factor into the decision. Your healthcare team will weigh the potential benefits against the risks for your specific situation.

Erdafitinib Brand Names

Erdafitinib is available under the brand name Balversa. This is the only commercial formulation currently available in most countries where the medication is approved.

When you receive your prescription, you'll see "Balversa" on the medication bottle along with the generic name "erdafitinib." Both names refer to the same medication, so don't be confused if you see either term used by your healthcare team.

Erdafitinib Alternatives

If erdafitinib isn't suitable for you or stops working effectively, your doctor may consider other treatment options. The best alternative depends on your specific cancer characteristics and overall health.

Other targeted therapies for bladder cancer might include different types of kinase inhibitors or immunotherapy medications. Traditional chemotherapy regimens may also be options, depending on your previous treatments and current condition.

Your oncologist will discuss the most appropriate alternatives based on your cancer's genetic profile, previous treatments, and your overall health status. Each treatment option has its own benefits and risks that need to be carefully considered.

Is Erdafitinib Better Than Other FGFR Inhibitors?

Erdafitinib was one of the first FGFR inhibitors specifically approved for bladder cancer, making direct comparisons with other similar medications limited. Clinical trials showed it can be effective in people whose cancers have FGFR genetic alterations.

Compared to traditional chemotherapy, erdafitinib often has a different side effect profile that some people find more manageable. However, "better" depends on your individual situation, including your cancer's specific characteristics and your overall health.

Your doctor will consider factors like your cancer's genetic makeup, previous treatments, and your ability to tolerate different side effects when choosing the best treatment approach for you.