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Common Side Effects of Tamoxifen
Tamoxifen has been studied thoroughly in clinical trials, in which a group of people taking the drug have side effects documented. In these studies, the most common side effects of tamoxifen included:
* Hot flashes -- in up to 80 percent of people
* Vaginal discharge -- up to 50 percent
* Water retention -- up to 32 percent
Serious Tamoxifen Side Effects
Some side effects with tamoxifen, while occurring infrequently, are potentially serious and should be reported immediately to your healthcare provider. These include, but are not limited to:
* Increase in tumor size or appearance of new tumors
* Difficulty breathing
* Depression
* Unusual or unexplained vaginal bleeding
* High blood pressure (hypertension)
* Chest pain
* Osteoporosis or broken bones
* Signs of a blood clot, such as:
o Pain
o Swelling
o Tenderness (especially in the legs)
* Signs of an allergic reaction, including:
o Unexplained rash
o Hives
o Itching
o Unexplained swelling.
* Nausea -- up to 26 percent
* Irregular menstrual periods -- up to 25 percent
* Weight loss -- up to 23 percent
* Vaginal bleeding -- up to 23 percent.
Other common tamoxifen side effects (occurring in 2 to 19 percent of people taking the drug) included:
* Bone pain
* Back pain
* Headaches
* Cough
* High cholesterol
* Fatigue
* Muscle pain
* Ovarian cysts
* Skin changes
* Infection
* Indigestion or heartburn
* Insomnia
* Constipation or diarrhea
* Anemia
* Weight gain
* Mood changes
* Hair loss.