What are the Most Common Letrozole Side Effects?

Debra Durkee
Debra Durkee
Hot flashes may be a side effect of Letrozole.
Hot flashes may be a side effect of Letrozole.

Letrozole is used in the treatment of women who have been diagnosed with breast cancer. The medication works by lowering the amount of estrogen produced in the body, so some of the letrozole side effects can be associated with this change in hormone production. Hot flashes, weight gain, and sweating spells are all commonly associated with taking the medication. Bones may also become brittle and more likely to break.

Letrozole may cause fatigue in some individuals.
Letrozole may cause fatigue in some individuals.

When women first starting the medication, the development of mild letrozole side effects is not uncommon. Some of these, such as hot flashes, mirror the effects of menopause. Other common side effects that are generally not cause for alarm include fatigue, muscle aches, headaches, hair loss, or swelling of the extremities. The individual may also feel tired and fatigued, but suffer from insomnia during the night. These side effects are generally mild enough that they do not cause the individual to stop taking the medication.

A person taking letrozole may experience anxiety, sleep disrutpions, or insomnia.
A person taking letrozole may experience anxiety, sleep disrutpions, or insomnia.

Other common and generally mild letrozole side effects include nausea and a flushing of the face. Pain similar to that from arthritis can also develop, along with a loss of appetite and an overall sense of exhaustion. Flu-like symptoms such as a cough, fever, chills, and drowsiness can also be common. For some, these symptoms fade as the body adjusts to the medication.

An overall sense of exhaustion may be a side effect of letrozole.
An overall sense of exhaustion may be a side effect of letrozole.

Some individuals can suffer from an allergic reaction when taking the medication for the first time. These letrozole side effects can range from mild to severe, and usually result in the individual being taken off the drug. An allergic reaction can interfere with breathing, manifest with a dry, itching sensation in the throat or chest, and may or may not include the development of a rash.

Letrozole side effects may include fever and chills.
Letrozole side effects may include fever and chills.

With the lessened estrogen production, there may also be changes in mood or personality. This generally includes suffering from periods of depression or unexplained feelings of anxiety that may or may not be made worse by the disruption of sleep. An individual may have insomnia or wake repeatedly throughout the night, and suffer from periods of excessive sweating at night.

Letrozole side effects may include nausea.
Letrozole side effects may include nausea.

Some individuals have suffered from severe letrozole side effects when taking the medication. For some, the medication has interfered with the cardiovascular system and caused blood clots leading to a heart attack. There may also be difficulty breathing or speaking, numbness or a painful swelling of certain areas of the body, jaundice, or dizziness that may lead to a loss of consciousness. While these symptoms are less common, they are of greater concern than others and should be discussed with a medical professional.

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    • Hot flashes may be a side effect of Letrozole.
      By: Ana Blazic Pavlovic
      Hot flashes may be a side effect of Letrozole.
    • Letrozole may cause fatigue in some individuals.
      By: WavebreakMediaMicro
      Letrozole may cause fatigue in some individuals.
    • A person taking letrozole may experience anxiety, sleep disrutpions, or insomnia.
      By: Photographee.eu
      A person taking letrozole may experience anxiety, sleep disrutpions, or insomnia.
    • An overall sense of exhaustion may be a side effect of letrozole.
      By: mario beauregard
      An overall sense of exhaustion may be a side effect of letrozole.
    • Letrozole side effects may include fever and chills.
      By: JackF
      Letrozole side effects may include fever and chills.
    • Letrozole side effects may include nausea.
      By: Gabriel Blaj
      Letrozole side effects may include nausea.
    • Letrozole may cause hair loss.
      By: prudkov
      Letrozole may cause hair loss.