(ta MOKS i fen)
Trade names: Novaldex®
Chemocare.com uses generic names in all descriptions of drugs. Novaldex is the trade
name for tamoxifen. In some cases, health care professionals may use the trade name
novaldex when referring to the generic drug name tamoxifen.
Drug type: Tamoxifen is a hormone therapy. This medication
is classified as an "anti-estrogen." (For more detail, see "How this drug
works" section below).
What this drug is used for:
- Tamoxifen may be given as adjuvant therapy (treatment after successful surgery)
in women or men with lymph node negative or lymph node positive breast cancer.
Cancers with positive estrogen and progesterone receptors are more likely to benefit
from tamoxifen. Tamoxifen reduces the risk of getting breast cancer in the
- Tamoxifen may be prescribed in metastatic (cancer that has spread) breast cancer
in both women and men.
- Tamoxifen may be prescribed in women with ductal carcinoma in situ (DCIS) who have
completed surgery and radiation therapy. Tamoxifen may reduce the risk of
invasive breast cancer. Risks and benefits of tamoxifen therapy should be
discussed in this setting.
- Tamoxifen may be prescribed for women at high risk of breast cancer to reduce the
incidence of developing breast cancer. Risks and benefits of tamoxifen therapy
should be discussed in this setting.
- Tamoxifen may also be prescribed for treatment of ovarian cancer.
Note: If a drug has been approved for one use, physicians may elect to use
this same drug for other problems if they believe it may be helpful.
How this drug is given:
- Tamoxifen is a pill, given by mouth. The pill should be swallowed whole.
- Tamoxifen should be taken at about the same time each day with a full glass of water.
If you miss a dose, do not take a double dose the next day.
- The amount of tamoxifen that you will receive depends on many factors, including
your general health or other health problems, and the type of cancer or condition
being treated. Your doctor will determine your dose, schedule and duration
Important things to remember about the side effects of tamoxifen:
- Most people do not experience all of the side effects listed.
- Side effects are often predictable in terms of their onset and duration.
- Side effects are almost always reversible and will go away after treatment is complete.
- There are many options to help minimize or prevent side effects.
- There is no relationship between the presence or severity of side effects and the
effectiveness of the medication.
The following side effects are common (occurring in greater than 30%) for
patients taking tamoxifen:
- Hot flashes (see sexuality)
- Vaginal discharge (see sexuality)
- Swelling (fluid retention in feet, ankles, or hands)
- Loss of libido (particularly in men) (see sexuality)
These side effects are less common side effects (occurring in about 10-29%)
of patients receiving tamoxifen:
- Menstrual irregularities
- Vaginal bleeding
- Weight loss
- Mood changes (see anxiety and/or depression)
A rare, but serious side effect of tamoxifen is blood clots, including
deep vein thrombosis (DVT) and pulmonary embolus. You should seek emergency
help and notify your health care provider immediately if you develop sudden chest
pain and shortness of breath. Notify your health care provider within 24 hours
if you notice that one leg is swollen, red, painful and/or warm to touch and the
other is not.
A rare, but serious side effect of tamoxifen can be the development of
uterine cancer. Women who have not had a hysterectomy should have regular
pap smears and gyn examinations. Abnormal vaginal bleeding should be reported
to your health care provider.
Your fertility, meaning your ability to conceive or father a child, may be affected
by tamoxifen. Please discuss this issue with your health care provider.
Not all side effects are listed above. Some that are rare (occurring in less than
10% of patients) are not listed here. However, you should always inform your
health care provider if you experience any unusual symptoms.
When to contact your doctor or health care provider:
Seek emergency help immediately and notify your health care provider,
it you experience the following symptoms:
- Sudden shortness of breath and/or chest pain
The following symptoms require medical attention, but are not an emergency.
Contact your health care provider within 24 hours of noticing any of the
- Swelling, redness and/or pain in one leg or arm and not the other
- New breast lumps
- Excessive vaginal discharge or bleeding, menstrual (period) pain or irregularities
- Nausea (interferes with ability to eat and unrelieved with prescribed medication)
- Depression (interfering with your ability to carry on your regular activities)
- Changes in vision
Always inform your health care provider if you experience any unusual symptoms.
- Before starting tamoxifen treatment, make sure you tell your doctor about any other
medications you are taking (including prescription, over-the-counter, vitamins,
herbal remedies, etc.). Do not take aspirin, or products containing
aspirin unless your doctor specifically permits this.
- Let your health care professional know if you have ever had a blood clot that required
- Inform your health care professional if you are pregnant or may be pregnant prior
to starting this treatment. Pregnancy category D (tamoxifen may be hazardous to
the fetus. Women who are pregnant or become pregnant must be advised of the
potential hazard to the fetus).
- For both men and women: Do not conceive a child (get pregnant) while taking tamoxifen.
Barrier methods of contraception, such as condoms, are recommended. Discuss with
your doctor when you may safely become pregnant or conceive a child after therapy.
- Do not breast feed while taking this medication.
- Do not stop taking this medication unless your healthcare provider tells you. You
may be on it for as long as 5 years.
- If you are experiencing hot flashes, wearing light clothing, staying in a cool environment,
and putting cool cloths on your head may reduce symptoms. Consult you health care
provider if these worsen, or become intolerable
- This medication causes little nausea. But if you should experience nausea,
take anti-nausea medications as prescribed by your doctor, and eat small frequent
meals. Sucking on lozenges and chewing gum may also help.
- Avoid sun exposure. Wear SPF 15 (or higher) sunblock and protective clothing.
- In general, drinking alcoholic beverages should be kept to a minimum or avoided
completely. You should discuss this with your doctor.
- Get plenty of rest.
- Maintain good nutrition.
- If you experience symptoms or side effects, be sure to discuss them with your health
care team. They can prescribe medications and/or offer other suggestions that
are effective in managing such problems.
Monitoring and testing:
You will be checked regularly by your health care professional while you are taking
tamoxifen, to monitor side effects and check your response to therapy. Periodic
blood work to monitor your complete blood count (CBC) as well as the function of
other organs (such as your kidneys and liver) may also be ordered by your doctor.
Women will need a gynecologic (GYN) examination before therapy, and during therapy,
at regular intervals. Discuss the appropriate schedule with your health care
How this drug works:
Hormones are chemical substances that are produced by glands in the body, which
enter the bloodstream and cause effects in other tissues. For example, the
hormone testosterone, made in the testicles and is responsible for male characteristics
such as deepening voice and increased body hair. The use of hormone therapy
to treat cancer is based on the observation that receptors for specific hormones
that are needed for cell growth are on the surface of some tumor cells. Hormone
therapy can work by stopping the production of a certain hormone, blocking hormone
receptors, or substituting chemically similar agents for the active hormone, which
cannot be used by the tumor cell. The different types of hormone therapies
are categorized by their function and/or the type of hormone that is affected.
Tamoxifen is an antiestrogen. Antiestrogens bind to estrogen receptor site
on cancer cells thus blocking estrogen from going into the cancer cell. This
interferes with cell growth and eventually leads to cell death. The following are
Note: We strongly encourage you to talk with your health
care professional about your specific medical condition and treatments. The information
contained in this website is meant to be helpful and educational, but is not a substitute
for medical advice.