Euflex

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ANTIANDROGENS, NONSTEROIDAL (Systemic)

Some commonly used brand names are:

In the U.S.—

  • Casodex 1
  • Eulexin 2
  • Nilandron 3

In Canada—

  • Anandron 3
  • Casodex 1
  • Euflex 2
This information applies to the following medicines:
1. Bicalutamide (bye-ka-LOO-ta-mide)
2. Flutamide (FLOO-ta-mide)
3. Nilutamide (nye-LOO-ta-mide)

Category

  • Antineoplastic—Bicalutamide; Flutamide; Nilutamide

Description

Nonsteroidal antiandrogens are used to treat cancer of the prostate gland. The prostate gland is present only in males; therefore, females do not get prostate cancer.

Nonsteroidal antiandrogens block the effect of the male hormone testosterone in the body. Giving a nonsteroidal antiandrogen together with another treatment that decreases the amount of testosterone produced in the body is one way of treating this type of cancer.

These medicines are available only with your doctor"s prescription, in the following dosage form(s):

  • Oral
  • Bicalutamide
    • Tablets (U.S. and Canada)
  • Flutamide
    • Capsules (U.S.)
    • Tablets (Canada)
  • Nilutamide
    • Tablets (U.S. and Canada)

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 the nonsteroidal antiandrogens, the following should be considered:

Allergies—Tell your doctor if you have ever had any unusual or allergic reaction to any of the nonsteroidal antiandrogens. Also tell your health care professional if you are allergic to any other substances, such as foods, preservatives, or dyes.

Fertility—Nonsteroidal antiandrogens, and other treatments for prostate cancer that are used together with these medicines, may cause low sperm counts or otherwise decrease a man"s ability to father a child. In some cases, these effects may be permanent. Men who wish to have children should discuss this with their doctors before starting treatment.

Pregnancy—Nonsteroidal antiandrogens are usually given to men. However, if one of these medicines is needed by a woman, it is very important that an effective method of avoiding pregnancy be used during treatment. Because these medicines block the effect of the male hormone, testosterone, they may interfere with the normal development of a male fetus.

Breast-feeding—Nonsteroidal antiandrogens are usually given to men, and it is not known whether any of these medicines passes into breast milk. However, nonsteroidal antiandrogens can cause serious side effects. Therefore, if a woman needs one of these medicines, she should not breast-feed during treatment.

Children—Studies with the nonsteroidal antiandrogens have been done only in adults, and there is no specific information comparing the use of these medicines in children with use in other age groups. There is a chance that a nonsteroidal antiandrogen could interfere with the development of boys. However, cancer of the prostate gland usually occurs in middle-aged or older men, so it is very unlikely that a child would need these medicines.

Older adults—Nonsteroidal antiandrogens have been tested in elderly people and have not been shown to cause different side effects or problems than they do in younger adults.

Race—A serious side effect of nilutamide that affects the lungs may be more likely to occur in Asian patients than in Caucasian patients.

Other 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 a nonsteroidal antiandrogen, it is especially important that your health care professional know if you are taking any of the following:

  • Anticoagulants such as warfarin (e.g., Coumadin)—Bicalutamide,flutamide, or nilutamide may increase the effects of the anticoagulant. Your doctor may recommend having your blood tested more often so that the dose of anticoagulant can be changed if necessary
  • Phenytoin (e.g., Dilantin) or
  • Theophylline (e.g., Theo-Dur; Theolair)—Nilutamide may increase the blood levels of these medicines in your body, which can increase the risk of serious side effects

Also tell your doctor if you smoke tobacco. Tobacco smoking may increase the risk of a rare side effect of flutamide.

Other medical problems—The presence of other medical problems may affect the use of nonsteroidal antiandrogens. Make sure you tell your doctor if you have any other medical problems, especially:

  • Certain blood deficiencies or disorders or
  • Tobacco smoking—Increased risk of anemia, other blood disorders, and jaundice
  • Liver disease—The chance of serious side effects may be increased
  • Lung disease or other breathing problems—One side effect of nilutamide can make your condition worse; your doctor may want to select a different antiandrogen

Proper Use of This Medicine

Take this medicine exactly as directed by your doctor . Do not take more or less of it, and do not take it more often than your doctor ordered. The exact amount of medicine you need has been carefully worked out. Taking too much may increase the chance of side effects, while taking too little may not improve your condition.

It is best to take this medicine at the same time each day . If you have been directed to take the medicine once a day, you may take it either in the morning or in the evening.

Bicalutamide and nilutamide may be taken with food or on an empty stomach.

A nonsteroidal antiandrogen is often used together with another medicine, which is given by injection. It is very important that the two medicines be used as directed. Follow your doctor"s instructions very carefully about when to use these medicines .

Unwanted effects, including hot flashes and decreased sexual ability, may occur during treatment for prostate cancer. Also, symptoms that often occur in men with prostate cancer, including difficult or painful urination, bloody urine, and urinary tract infections, may occur or continue to occur for a while, until your condition starts to improve. It is very important that you continue to take the medicine, even if it causes side effects or if you start to feel better . Do not stop taking this medicine without first checking with your doctor .

If you vomit shortly after taking a dose of this medicine, check with your doctor. You will be told whether to take the dose again or to wait until the next scheduled dose.

Dosing—The doses of these medicines 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 these medicines. If your dose is different, do not change it unless your doctor tells you to do so.

The number of capsules or tablets 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 which of these medicines you are taking .

  • For bicalutamide
  • For the oral dosage form (tablets):
    • For prostate cancer:
      • Adults—50 milligrams (mg) (one tablet) once a day.
      • Children—It is unlikely that bicalutamide would be needed to treat cancer of the prostate in a child. If a child needs this medicine, the dose would have to be determined by the doctor.
  • For flutamide
  • For oral dosage forms (capsules or tablets):
    • For prostate cancer:
      • Adults—250 milligrams (mg) (two 125-mg capsules or one 250-mg tablet) every eight hours.
      • Children—It is unlikely that flutamide would be needed to treat cancer of the prostate in a child. If a child needs this medicine, the dose would have to be determined by the doctor.
  • For nilutamide
  • For the oral dosage form (tablets):
    • For prostate cancer:
      • Adults—300 milligrams (mg) (six 50-mg tablets) once a day for the first thirty days, then 150 mg (three 50-mg tablets) once a day.
      • Children—It is unlikely that nilutamide would be needed to treat cancer of the prostate in a child. If a child needs this medicine, the dose would have to be determined by the doctor.

Missed dose—If you miss a dose of this medicine, take it as soon as possible.

For bicalutamide or nilutamide: If you do not remember your missed dose until the next day, skip the missed dose and go back to your regular dosing schedule. Do not double doses.

For flutamide: 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.

Storage—To store this medicine:

  • Keep out of the reach of children.
  • Store away from heat and direct light.
  • Do not store in the bathroom, near the kitchen sink, or in other damp places. Heat or moisture may cause the medicine to break down.
  • Do not keep outdated medicine or medicine no longer needed. Be sure that any discarded medicine is out of the reach of children.

Precautions While Using This Medicine

It is very important that your doctor check your progress at regular visits to make sure that this medicine is working properly and to check for unwanted effects.

Nonsteroidal antiandrogens rarely cause liver problems during treatment. The most important signs of this side effect are pain or tenderness in the upper right side of the abdomen (stomach) and yellow eyes or skin. Check with your doctor immediately if either of these occurs. Also, check with your doctor as soon as possible if itching occurs or your urine appears unusually dark. Other possible symptoms, such as loss of appetite, nausea or vomiting, and “flu-like” symptoms (headache, muscle or joint pain, or tiredness), can occur during treatment even if you are not having any liver problems. These symptoms usually do not need medical attention. However, if two or more of them occur at the same time, and they last for more than a few days, check with your doctor even if you do not have any of the other symptoms mentioned earlier.

For patients taking nilutamide :

  • Check with your doctor right away if shortness of breath or difficult breathing occurs or gets worse during treatment.
  • Be very careful while driving, especially when you drive into or out of tunnels . Nilutamide can temporarily change the way your eyes react to light. You may not be able to see as well as usual for up to several minutes after going from bright light to darkness or from dark to lighted areas. Also, nilutamide can cause your eyes to be more sensitive to light than they are normally. Wearing eyeglasses with tinted lenses or sunglasses may help reduce these effects.
  • Drinking alcoholic beverages while taking nilutamide may cause unwanted effects in some people. Possible effects include feeling dizzy, lightheaded, or faint; flushing of the face; or a general feeling of illness. If you notice any of these effects, do not drink any more alcoholic beverages while you are being treated with this medicine.

Side Effects of This Medicine

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:

Less common

Chest pain; shortness of breath or difficult or troubled breathing

Rare

Pain or tenderness in the upper right side of the abdomen (stomach); yellow eyes or skin

Also, check with your doctor as soon as possible if any of the following side effects occur:

More common

Cough or hoarseness; fever; runny nose; sneezing; sore throat; tightness in chest or wheezing

Less common

Bloody or black, tarry stools; chills (flutamide only); itching; lower back or side pain (flutamide only); mental depression; numbness, tingling, pain, or muscle weakness in hands, arms, feet, or legs; skin rash; swelling of face, fingers, feet, or lower legs; unusual tiredness or weakness

Rare

Bluish-colored lips, fingernails, or palms of hands (flutamide only); dark urine; dizziness (severe) or fainting (flutamide only); feeling of severe pressure in head (flutamide only); pinpoint red spots on skin; unusual bleeding or bruising

Other 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. However, check with your doctor if any of the following side effects continue or are bothersome:

More common

Constipation; decrease in or loss of appetite; diarrhea; dizziness; headache; impotence or decrease in sexual desire; nausea; swelling of breasts with pain or tenderness; trouble in sleeping

Less common

Bloated feeling, gas, or indigestion; change in color vision (nilutamide only); confusion; drowsiness; dryness of mouth; “flu-like” symptoms, such as headache, muscle or joint pain, or tiredness (occurring together); nervousness; vomiting

Although not all of the side effects listed above have been reported for all of these medicines, they have been reported for at least one of them. However, because all nonsteroidal antiandrogens are very similar, it is possible that any of the above side effects may occur with any of these medicines.

In addition to the effects listed above, hot flashes (flushing, sudden sweating, and feeling of warmth) often occur during treatment with these medicines. Also, flutamide may cause your urine to have an amber or a yellow-green color. These effects are harmless and do not need medical attention.

Other side effects not listed above may also occur in some patients. If you notice any other effects, check with your doctor.

Revised: 08/22/2001

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