Drug
Tamoxifen
Pronounced
"ta-MOX-ih-fen" "SOL-ta-mox"
Uses
Tamoxifen is used to treat breast cancer. It is also used to reduce the chances of breast cancer in high-risk patients.
This medication can block the growth of breast cancer. It works by interfering with the effects of estrogen in the breast tissue.
Warning
Tamoxifen has rarely caused very serious (possibly fatal) strokes, blood clots in the lungs/legs, and cancer of the uterus. If you are taking tamoxifen to reduce the risk of breast cancer, or if your cancer is limited to the milk ducts (ductal carcinoma in situ-DCIS), then discuss the benefits and risks of taking this medication with your doctor. However, if you are taking tamoxifen to treat breast cancer, then the benefits of taking tamoxifen are greater than the risks of side effects.
Get medical help right away if you develop symptoms of a stroke or blood clots in the lungs/legs, such as weakness on one side of the body, trouble speaking, sudden vision changes, confusion, shortness of breath, chest pain, or calf pain/swelling.
Tell your doctor right away if you develop symptoms of cancer of the uterus, such as unusual changes in your monthly period (such as the amount or timing of bleeding), unusual vaginal discharge, or pain/pressure below your "belly button" (navel).
How to Use This Medication
Read the Medication Guide provided by your pharmacist before you start using tamoxifen and each time you get a refill. If you have any questions, consult your doctor or pharmacist.
Take this medication by mouth with or without food as directed by your doctor, usually once or twice daily for 5 years. Daily dosages greater than 20 milligrams are usually divided in half and taken twice a day, in the morning and evening, or as directed by your doctor. If you are using the liquid, measure the dose carefully using a special measuring device/spoon. Do not use a household spoon because you may not get the correct dose.
Dosage is based on your medical condition and response to treatment. The duration of treatment to prevent cancer from returning may be between 5 to 10 years, depending on your medical condition and response to treatment.
Use this medication regularly to get the most benefit from it. To help you remember, take it at the same time(s) each day.
If you have breast cancer that has spread to other parts of the body, you may experience increased bone/cancer pain and/or disease flare-up as you start taking tamoxifen. In some cases, this may be a sign of a good response to the medication. Symptoms include increased bone pain, increased tumor size, or even new tumors. These symptoms usually disappear quickly. Always tell your doctor right away about these symptoms.
Since this drug can be absorbed through the skin and lungs, women who are pregnant or who may become pregnant should not handle this medication or breathe the dust from the tablets. (See also Precautions section.)
Tell your doctor right away if your condition gets worse (such as you get new breast lumps).