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Fareston Side Effects

Generic Name: toremifene

Note: This document contains side effect information about toremifene. Some of the dosage forms listed on this page may not apply to the brand name Fareston.

In Summary

Common side effects of Fareston include: hot flash, nausea, vaginal discharge, and diaphoresis. Other side effects include: dizziness, edema, and vomiting. See below for a comprehensive list of adverse effects.

For the Consumer

Applies to toremifene: oral tablet

Along with its needed effects, toremifene (the active ingredient contained in Fareston) may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur while taking toremifene:

Less common
  • Anxiety
  • arm, back, or jaw pain
  • blurred vision
  • change in how much and how often you urinate
  • change in vaginal discharge
  • changes in skin color
  • changes in vision
  • changes in weight
  • chest pain, discomfort, tightness, or heaviness
  • confusion
  • constipation
  • cough
  • depression
  • dilated neck veins
  • dizziness, lightheadedness
  • dry mouth
  • fainting
  • fast, slow, or irregular heartbeat
  • inability to speak, incoherent speech
  • irregular breathing
  • loss of appetite
  • metallic taste in the tongue
  • muscle weakness
  • nausea
  • pain or discomfort in the arms, jaw, back, or neck
  • pain or feeling of pressure in the pelvis
  • pain, tenderness, or swelling of the foot or leg
  • seizures
  • severe or sudden headache
  • stomach pain
  • sweating
  • swelling of the face, fingers, feet, or lower legs
  • temporary blindness
  • tenderness, pain, swelling, warmth, skin discoloration, prominent superficial veins over the affected area
  • thirst
  • troubled breathing
  • unusual tiredness or weakness
  • vaginal bleeding
  • vomiting
  • weakness in the arm and or leg on one side of the body, sudden and severe
Incidence not known
  • Black, tarry stools
  • bleeding gums
  • blood in the urine or stools
  • chills
  • clay-colored stools
  • dark urine
  • fever
  • itching
  • painful or difficult urination
  • pinpoint red spots on the skin
  • rash
  • sore throat
  • sores, ulcers, or white spots on the lips or in the mouth
  • swollen glands
  • unpleasant breath odor
  • unusual bleeding or bruising
  • vomiting of blood
  • yellow eyes or skin

Some side effects of toremifene may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

More common
  • Blindness
  • decreased vision
  • dry eyes
  • feeling of warmth
  • redness of the face, neck, arms, and occasionally, the upper chest
  • sudden sweating
  • sweating
Less common
  • Bone pain
  • changes in vision
  • double vision
  • eye pain
  • tearing
Incidence not known
  • Blistering, crusting, irritation, itching, or reddening of the skin
  • cracked, dry, or scaly skin
  • depression
  • difficulty having a bowel movement
  • feeling of constant movement of self or surroundings
  • feeling unusually cold
  • hair loss
  • lack or loss of strength
  • partial or slight paralysis
  • sensation of spinning
  • shakiness in the legs, arms, hands, or feet
  • thinning of the hair

For Healthcare Professionals

Applies to toremifene: oral tablet


Adverse drug reactions are primarily due to the anti-estrogenic actions of this drug and typically occur at the beginning of treatment.[Ref]


Very common (10% or more): Hot flashes/flushes (35%)
Common (1% to 10%): Myocardial infarction, arrhythmia, cardiac failure, thrombophlebitis, thrombosis
Uncommon (0.1% to 1%): Angina pectoris
Frequency not reported: QT/QTc interval prolongation[Ref]


Very common (10% or more): Sweating (20%)
Common (1% to 10%): Rash, pruritus/itching
Uncommon (0.1% to 1%): Skin discoloration
Rare (less than 0.1%): Dermatitis, alopecia[Ref]


Very common (10% or more): Elevated AST (19%), elevated alkaline phosphatase (19%)
Common (1% to 10%): Elevated bilirubin
Rare (less than 0.1%): Jaundice
Very rare (less than 0.01%): Hepatitis[Ref]


Very common (10% or more): Nausea (14%)
Common (1% to 10%): Vomiting
Uncommon (0.1% to 1%): Constipation[Ref]


Very common (10% or more): Vaginal discharge/leukorrhea (13%)
Common (1% to 10%): Vaginal/uterine bleeding
Uncommon (0.1% to 1%): Endometrial hypertrophy
Rare (less than 0.1%): Endometrial polyps
Very rare (less than 0.01%): Endometrial hyperplasia[Ref]


Very common (10% or more): Cataracts (10%)
Common (1% to 10%): Dry eyes, abnormal visual fields, corneal keratopathy, glaucoma, abnormal vision/diplopia
Uncommon (0.1% to 1%): Reversible corneal opacity (corneal verticillata/verticulata)[Ref]


Common (1% to 10%): Hypercalcemia
Uncommon (0.1% to 1%): Anorexia, increased weight, appetite loss[Ref]

Nervous system

Common (1% to 10%): Dizziness, cerebrovascular accident/transient ischemic attack
Uncommon (0.1% to 1%): Paresis, tremor, vertigo, headache
Rare (less than 0.1%): Stiffness
Frequency not reported: Rigors[Ref]


Common (1% to 10%): Edema, pain, fatigue
Uncommon (0.1% to 1%): Asthenia, chest pain[Ref]


Common (1% to 10%): Depression
Uncommon (0.1% to 1%): Insomnia
Rare (less than 0.1%): Emotional lability[Ref]


Common (1% to 10%): Pulmonary embolism
Uncommon (0.1% to 1%): Dyspnea[Ref]


Uncommon (0.1% to 1%): Back pain[Ref]


Rare (less than 0.1%): Leukopenia, thrombocytopenia
Frequency not reported: Anemia[Ref]


Very rare (less than 0.01%): Endometrial cancer
Frequency not reported: Tumor flare[Ref]


1. Cerner Multum, Inc. "UK Summary of Product Characteristics." O 0

2. "Product Information. Fareston (toremifene)." Schering Laboratories, Kenilworth, NJ.

3. Cerner Multum, Inc. "Australian Product Information." O 0

Some side effects of Fareston may not be reported. Always consult your doctor or healthcare specialist for medical advice. You may also report side effects to the FDA.

Disclaimer: Every effort has been made to ensure that the information provided is accurate, up-to-date and complete, but no guarantee is made to that effect. In addition, the drug information contained herein may be time sensitive and should not be utilized as a reference resource beyond the date hereof. This material does not endorse drugs, diagnose patients, or recommend therapy. This information is a reference resource designed as supplement to, and not a substitute for, the expertise, skill , knowledge, and judgement of healthcare practitioners in patient care. The absence of a warning for a given drug or combination thereof in no way should be construed to indicate safety, effectiveness, or appropriateness for any given patient. does not assume any responsibility for any aspect of healthcare administered with the aid of materials provided. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the substances you are taking, check with your doctor, nurse, or pharmacist.