What to do if Enzalutamide causes fatigue and confusion?

Hello,

Welcome to icliniq.com.

I read your query and understood your concern.

Enzalutamide is an effective treatment for metastatic castration-resistant prostate cancer (mCRPC), and your prostate-specific antigen (PSA) drop from 28.4 to 12.1 ng/mL is encouraging. However, the side effects you are experiencing, including severe fatigue, mental confusion (sometimes called chemotherapy brain or cognitive dysfunction), and falls, are known potential complications associated with this medication. Let us address your concerns one by one:

Fatigue is one of the most common side effects of Enzalutamide, occurring in up to 50 % of patients. It may be due to the medication's impact on hormone levels and your body's energy regulation. Severe fatigue can increase the risk of falls and impact daily functioning.

Cognitive effects, such as difficulty concentrating or memory problems, can occur due to Enzalutamide's impact on the central nervous system (CNS). This may present as difficulty multitasking, slower thinking, or forgetfulness.

Enzalutamide can increase the risk of falls due to a combination of fatigue, dizziness, or muscle weakness. Falls are concerning because they may lead to fractures or other injuries, particularly if bone metastases are present.

The severity of your symptoms suggests they are significantly affecting your quality of life. A dose reduction may be considered under your doctor’s guidance to determine if it reduces the side effects while maintaining efficacy. If symptoms persist, switching to an alternative treatment may be necessary.

Other medications, such as Abiraterone Acetate (Zytiga), may be considered. It also targets androgen signaling but has a different side effect profile. You could also discuss the option of chemotherapy (Docetaxel) or second-line hormonal therapies if Enzalutamide is not tolerated.

Managing current symptoms:

1. Lifestyle modifications: Prioritize rest, reduce work hours if possible, and engage in light physical activity to boost energy levels.
2. Medications: Consider medications like Modafinil or Methylphenidate to improve fatigue and alertness. Your doctor may prescribe these to help with energy levels.
3. Cognitive training: Memory aids (lists, calendars) can help improve focus. Discuss with your doctor whether adjusting the dose or switching medications could alleviate central nervous system effects.
4. Fall prevention: Use assistive devices like canes or walkers temporarily. Minimize fall risks at home (remove clutter, install grab bars). Consider physical therapy to improve strength and balance.

Monitoring and follow-up:

1. Continue to monitor PSA levels to evaluate the response to Enzalutamide. A sustained PSA decline is a positive sign that the treatment is working.
2. Ensure regular dual-energy X-ray absorptiometry (DEXA) scans to assess bone density, as prostate cancer and androgen-deprivation therapies can weaken bones. Consider calcium and vitamin D supplements or bone-strengthening agents like Denosumab or Zoledronic acid.
3. If mental confusion worsens, ruling out other causes (for example, brain metastases and metabolic imbalances) is essential.
4. Schedule an urgent follow-up with your oncologist to discuss the severity of your side effects, possible dose adjustment, alternative therapies, or supportive medications for symptom relief.

Discuss supportive care options, including palliative care, to help manage symptoms and improve your quality of life.

While your PSA response to Enzalutamide is promising, the severity of your side effects warrants a review of your treatment plan. Fatigue, cognitive difficulties, and falls are concerning and could potentially be mitigated by dose adjustments, symptom management strategies, or a switch to an alternative therapy.

Ensure close communication with your healthcare team to optimize your care plan and maintain your quality of life. Let me know if you would like further guidance on how to discuss these issues with your oncologist.

I hope this has helped you.

Kindly follow up if you have more doubts.

Thank you.