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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.
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