Medically reviewed on June 7, 2018
Commonly used brand name(s)
In the U.S.
Available Dosage Forms:
- Capsule, Liquid Filled
Therapeutic Class: Antineoplastic Agent
Uses For This Medicine
Enzalutamide is used to treat metastatic (cancer that has spread) prostate cancer. It works to stop the growth of cancer cells by blocking the effects of androgen hormones (eg, testosterone). Enzalutamide is an antiandrogen cancer medicine.
Enzalutamide is available only with your doctor's prescription.
Before Using This Medicine
In deciding to use a medicine, the risks of taking the medicine must be weighed against the good it will do. This is a decision you and your doctor will make. For enzalutamide, the following should be considered:
Tell your doctor if you have ever had any unusual or allergic reaction to enzalutamide or any other medicines. Also tell your health care professional if you have any other types of allergies, such as to foods, dyes, preservatives, or animals. For non-prescription products, read the label or package ingredients carefully.
Appropriate studies have not been performed on the relationship of age to the effects of enzalutamide in the pediatric population. Safety and efficacy have not been established.
Appropriate studies performed to date have not demonstrated geriatric-specific problems that would limit the usefulness of enzalutamide in the elderly.
There are no adequate studies in women for determining infant risk when using this medication during breastfeeding. Weigh the potential benefits against the potential risks before taking this medication while breastfeeding.
Interactions with Medicines
Although certain medicines should not be used together at all, in other cases two different medicines may be used together even if an interaction might occur. In these cases, your doctor may want to change the dose, or other precautions may be necessary. When you are taking enzalutamide, it is especially important that your healthcare professional know if you are taking any of the medicines listed below. The following interactions have been selected on the basis of their potential significance and are not necessarily all-inclusive.
Using enzalutamide with any of the following medicines is not recommended. Your doctor may decide not to treat you with this medication or change some of the other medicines you take.
Using enzalutamide with any of the following medicines is usually not recommended, but may be required in some cases. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.
- Doxorubicin Hydrochloride Liposome
- Ethinyl Estradiol
- St John's Wort
Using enzalutamide with any of the following medicines may cause an increased risk of certain side effects, but using both drugs may be the best treatment for you. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.
- Aripiprazole Lauroxil
Interactions with Food/Tobacco/Alcohol
Certain medicines should not be used at or around the time of eating food or eating certain types of food since interactions may occur. Using alcohol or tobacco with certain medicines may also cause interactions to occur. Discuss with your healthcare professional the use of your medicine with food, alcohol, or tobacco.
Other Medical Problems
The presence of other medical problems may affect the use of enzalutamide. Make sure you tell your doctor if you have any other medical problems, especially:
- Brain injury, history of or
- Brain tumor, history of or
- Seizures, history of or
- Stroke, history of or
- Transient ischemic attack, recent—Use with caution. May cause side effects to become worse.
Proper Use of This Medicine
Take enzalutamide only as directed by your doctor. Do not take more of it, do not take it more often, and do not take it for a longer time than your doctor ordered.
Enzalutamide comes with a patient information leaflet. Read and follow the instructions carefully. Ask your doctor if you have any questions.
Take your medicine at the same time each day with or without food.
Swallow the capsule whole. Do not chew, dissolve, or open it.
If you are taking 2 cancer medicines, follow your doctor's instructions on when to take them.
The dose of enzalutamide will be different for different patients. Follow your doctor's orders or the directions on the label. The following information includes only the average doses of enzalutamide. If your dose is different, do not change it unless your doctor tells you to do so.
The amount of medicine that you take depends on the strength of the medicine. Also, the number of doses you take each day, the time allowed between doses, and the length of time you take the medicine depend on the medical problem for which you are using the medicine.
- For oral dosage form (capsules):
- For prostate cancer:
- Adults—160 milligrams (mg) (four 40 mg capsules) once a day.
- Children—Use and dose must be determined by your doctor.
- For prostate cancer:
If you miss a dose of enzalutamide, take it as soon as possible. However, if it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Do not double doses.
Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light. Keep from freezing.
Keep out of the reach of children.
Do not keep outdated medicine or medicine no longer needed.
Ask your healthcare professional how you should dispose of any medicine you do not use.
Precautions While Using This Medicine
It is very important that your doctor check your progress at regular visits to make sure enzalutamide is working properly and to check for unwanted effects.
Women should not use enzalutamide, especially women who are pregnant or able to become pregnant. Enzalutamide can harm an unborn baby. It can also cause birth defects if the father is using it when his sexual partner becomes pregnant. You must use a condom together with a second effective form of birth control during therapy and for 3 months after the last dose. If a pregnancy occurs while you are using enzalutamide, tell your doctor right away.
Enzalutamide may cause dizziness, tiredness, muscle weakness, or seizures (very rare). Avoid driving, using machines, or doing anything else that could be dangerous until you know how enzalutamide affects you.
Enzalutamide may cause a neurological disorder called posterior reversible encephalopathy syndrome (PRES). Check with your doctor right away if you have seizures, headache, confusion, unusual drowsiness, dullness, tiredness, weakness, feeling of sluggishness, or blurred vision.
Do not take other medicines unless they have been discussed with your doctor. This includes prescription or nonprescription (over-the-counter [OTC]) medicines and herbal (eg, St. John's wort) or vitamin supplements.
This Medicine Side Effects
Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor immediately if any of the following side effects occur:
- Back pain
- bloating or swelling of the face, arms, hands, lower legs, or feet
- blood in the urine
- blurred vision
- chest pain
- cough with mucus
- difficulty with breathing
- fever or chills
- loss of bladder or bowel control
- painful or difficult urination
- pounding in the ears
- slow or fast heartbeat
- sore throat
- tingling of the hands or feet
- unable to move the legs
- unusual weight gain or loss
- confusion or excitement
- loss of memory
- memory or attention span problems
- nightmares or vivid dreams
- rapid, shallow breathing
Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
- Body aches or pain
- bone pain
- burning, crawling, itching, numbness, prickling, "pins and needles", or tingling feelings
- difficulty having a bowel movement (stool)
- difficulty with moving
- dry throat
- ear congestion
- feeling of constant movement of self or surroundings
- feeling of warmth
- joint pain
- lack or loss of strength
- loss of voice
- muscle pain, stiffness, or weakness
- pain or tenderness around the eyes and cheekbones
- redness of the face, neck, arms, and upper chest
- sensation of spinning
- stuffy or runny nose
- tender, swollen glands in the neck
- trouble sleeping
- trouble with swallowing
- unusual tiredness or weakness
- Bloody nose
- dry skin
- frequent urination
- itching skin
- pale-colored urine
Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.
Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.
See also: Side effects (in more detail)
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.
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More about enzalutamide
- Enzalutamide Side Effects
- During Pregnancy
- Dosage Information
- Drug Interactions
- Support Group
- En Español
- 4 Reviews
- Drug class: antiandrogens
Other brands: Xtandi