Xtandi for Prostate Cancer: What It Treats, How It Works, and What to Expect

What Xtandi Is Used For in Prostate Cancer

Xtandi (enzalutamide) is a prescription androgen receptor inhibitor indicated for adults with prostate cancer that has progressed despite hormone therapy. In the metastatic setting, it is approved for castration-resistant prostate cancer (mCRPC) that has spread to other parts of the body. It is also approved for non-metastatic castration-resistant prostate cancer (nmCRPC), where the cancer has not spread but PSA levels continue to rise despite testosterone suppression. Treatment decisions depend on disease stage, prior therapies, and overall health status.

How Xtandi Works

Prostate cancer cells often rely on androgens like testosterone to grow. Xtandi works by blocking the androgen receptor, preventing androgens from binding and signaling cancer cells to multiply. Unlike some earlier hormone therapies, Xtandi also inhibits nuclear translocation of the receptor and blocks its interaction with DNA. This makes it a potent option when other hormonal treatments have stopped working. It is taken as an oral capsule, usually once daily, and can be used with or without food.

Dosing and Treatment Schedule

The standard dose of Xtandi for prostate cancer is 160 mg taken orally once daily. Treatment continues until disease progression or unacceptable toxicity occurs. Regular monitoring with PSA tests, imaging, and blood work helps assess response. If a patient experiences severe side effects or liver injury, the dose may be interrupted, reduced, or stopped. Patients should not crush or chew the capsules and should report any new symptoms promptly to their care team.

Common Side Effects and Risks

The most frequently reported side effects include fatigue, back pain, hot flashes, decreased appetite, weight loss, and hypertension. More serious risks include seizures, which have occurred in clinical trials even in patients without a prior history of seizures. Liver injury is another concern, requiring periodic liver function tests. Allergic reactions, though rare, can occur. Because Xtandi affects hormone pathways, it may also impact fertility. Patients should discuss these risks with their oncologist before starting treatment.

Xtandi in the Treatment Landscape

Xtandi is often used after docetaxel chemotherapy or in combination with other hormone therapies, depending on the line of treatment. In the nmCRPC setting, it can delay the time to metastasis and extend the period during which the disease remains controlled without chemotherapy. Compared with older antiandrogens, Xtandi has demonstrated improved overall survival and a distinct side effect profile, though individual responses vary. Oncologists weigh disease burden, prior treatments, and patient preferences when choosing among available options.

What to Discuss With Your Care Team

Before starting Xtandi, patients should provide a complete medical history, including any history of seizures, liver disease, or heart conditions. It is important to disclose all other medications, including over-the-counter drugs and supplements, because interactions can affect safety and efficacy. Questions to consider include: What monitoring will be needed? How will we know if the treatment is working? What side effects should trigger an urgent call? A clear plan for managing symptoms and follow-up helps support treatment adherence and quality of life.

Living With Xtandi Treatment

Managing daily life during Xtandi therapy involves paying attention to energy levels, blood pressure, and any new or worsening symptoms. Staying hydrated, maintaining a balanced diet, and light physical activity when tolerated can help manage fatigue. Support from family, caregivers, or a prostate cancer community can ease the emotional burden of treatment. Keeping a log of side effects and questions between appointments makes clinical visits more productive and helps the care team make timely adjustments.