August 29, 2015
Recommended Topic Related To:


"The result of a breast biopsy often determines the course of treatment and helps to predict a woman's risk of a future breast cancer diagnosis. Criteria for making diagnoses have been established, but it's been unclear how consistently patholo"...




Lethality was observed in rats following single oral doses that were ≥ 1000 mg/kg (about 150 times the recommended human dose on a mg/m² basis) and was associated with gastric atony/dilatation leading to interference with digestion and adrenal enlargement.

Vertigo, headache, and dizziness were observed in healthy volunteer studies at a daily dose of 680 mg for 5 days. The symptoms occurred in two of the five subjects during the third day of the treatment and disappeared within 2 days of discontinuation of the drug. No immediate concomitant changes in any measured clinical chemistry parameters were found. In a study in postmenopausal breast cancer patients, toremifene 400 mg/m²/day caused dose-limiting nausea, vomiting, and dizziness, as well as reversible hallucinations and ataxia in one patient.

Theoretically, overdose may be manifested as an increase of antiestrogenic effects, such as hot flashes; estrogenic effects, such as vaginal bleeding; or nervous system disorders, such as vertigo, dizziness, ataxia, and nausea. There is no specific antidote and the treatment is symptomatic.


Hypersensitivity to the Drug

FARESTON is contraindicated in patients with known hypersensitivity to the drug.

QT Prolongation, Hypokalemia, Hypomagnesemia

Toremifene should not be prescribed to patients with congenital/acquired QT prolongation (long QT syndrome), uncorrected hypokalemia, or uncorrected hypomagnesemia.

Last reviewed on RxList: 6/3/2011
This monograph has been modified to include the generic and brand name in many instances.


Fareston - User Reviews

Fareston User Reviews

Now you can gain knowledge and insight about a drug treatment with Patient Discussions.

Here is a collection of user reviews for the medication Fareston sorted by most helpful. Patient Discussions FAQs

Report Problems to the Food and Drug Administration


You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

Breast Cancer

Find support and advances in treatment.