Flutamide (Eulexin®, Drogenil®)

OncoLink Team
Last Modified: November 2, 2015

Pronounced: FLEW-tuh-mide
Classification: Antiandrogen

About Flutamide

Most prostate cancers need supplies of the male hormone testosterone to grow. Testosterone is an androgen (hormone) produced by the testes and adrenal glands. Flutamide works by blocking testosterone receptors on the prostate cells, and therefore preventing testosterone from attaching to the receptors on the surface of the prostate cancer cells. Without testosterone, the cancer cells may either grow more slowly, or stop growing altogether.

How to Take Flutamide

Flutamide is given as a capsule, taken three times a day (spaced every 8 hours). For patients who cannot swallow pills, the capsule can be opened and its contents mixed with food, such as applesauce or pudding.

This medication can be affect blood levels of Coumadin (blood thinner).  Be sure to tell your healthcare provider about all medications and supplements you take.

Where do I get this medication?

Flutamide is available through select specialty pharmacies. Your oncology team will work with your prescription drug plan to identify an in-network specialty pharmacy for distribution of this medication and shipment directly to your home. 

Insurance Information

This medication may be covered under your prescription drug plan. Patient assistance may be available to qualifying individuals without prescription drug coverage. Co-pay assistance offered through private third party foundations, may also be available. Your care team can help you find these resources, if they are available.

Possible Side Effects of Flutamide

There are a number of things you can do to manage the side effects of flutamide. Talk to your doctor or nurse about these recommendations. They can help you decide what will work best for you. These are some of the most common side effects:

Discolored Urine

Your urine may appear orange-brown or green-yellow in color while taking this medication. This is expected and not a cause of concern as the medication is cleared from your body. If you have other urinary symptoms, such as frequency or painful urination, call your doctor or nurse.

Liver Toxicity

This medication can cause damage to your liver, which your healthcare provider will monitor for regularly with blood tests. Notify your healthcare provider if you notice yellowing of the skin or eyes (jaundice), your urine appears dark or brown, you have nausea or pain in your abdomen, as these can be signs of liver toxicity.

Nausea and/or Vomiting

Talk to your doctor or nurse so they can prescribe medications to help you manage nausea and vomiting. In addition, dietary changes may help. Avoid things that may worsen the symptoms, such as heavy or greasy/fatty, spicy or acidic foods (lemons, tomatoes, oranges). Try antacids, (e.g. milk of magnesia, calcium tablets such as Tums), saltines, or ginger ale to lessen symptoms.

Call your doctor or nurse if you are unable to keep fluids down for more than 12 hours or if you feel lightheaded or dizzy at any time.

Hot Flashes

There are a few things you can do to help with hot flashes. Several medications have been shown to help with symptoms, including clonidine (a blood pressure medication), low doses of certain antidepressants (such as venlafaxine and Prozac), and gabapentin. Non-medical recommendations include:

  • Keep well-hydrated with eight glasses of water daily.
  • Drink ice water or apply an ice pack at the onset of a hot flash.
  • Wear cotton or lightweight, breathable fabrics and dress in layers so you can adjust as needed.
  • Exercise on a regular basis.
  • Try practicing meditation or relaxation exercises to manage stress, which can be a trigger.
  • Avoid triggers such as warm rooms, spicy foods, caffeinated beverages, and alcohol.

Weakening of the Bones (Osteoporosis)

Men who take hormone therapy for extended periods of time are at risk for bone thinning (osteoporosis). You may be advised to take calcium and vitamin D supplements to help prevent bone loss. Weight bearing exercise and a healthy diet rich in calcium and vitamin D can also help protect your bone health. You may have a bone density scan (DEXA scan) to assess your bone health. If your physician determines that you are at high risk of developing osteoporosis, they may recommend additional treatment with a type of medication called a bisphosphonate to help strengthen the bones.

Breast Tenderness or Increase in Breast Tissue

An increase in breast tissue (gynecomastia) or breast tenderness may develop. Your healthcare team can suggest medications to relieve the tenderness. In rare cases, radiation can be given to relieve severe tenderness.

Sexual and Reproductive Changes

This drug can affect your reproductive system, resulting in sperm production becoming irregular or stopping permanently. In addition, you may experience erectile dysfunction or a decreased desire for sex during treatment. Talk to your urologist about options for treating erectile dysfunction.

Exposure of an unborn child to this medication could cause birth defects, so you should not father a child while on this medication. Effective birth control is necessary during treatment, even if you believe you are not producing sperm. You may want to consider sperm banking if you may wish to have a child in the future. Discuss these options with your oncology team.



If you have questions or concerns about the medication that you have been prescribed, please contact your healthcare team. OncoLink is designed for educational purposes only and is not engaged in rendering medical advice or professional services. The information provided through OncoLink should not be used for diagnosing or treating a health problem or a disease. It is not a substitute for professional care. If you have or suspect you may have a health problem, you should consult your health care provider.


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Catherine and Finn
by OncoLink Editorial Team
December 01, 2015