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Synthetic estrogen hormone historically used to treat urinary incontinence in spayed female dogs and benign prostatic hypertrophy (enlarged prostate) in male dogs.
The use of diethylstilbestrol (DES) is controversial and no longer common. Clients should use personal protective equipment (wear gloves and/or wash hands after touching) to minimize risk of exposure. Pregnant women should avoid handling DES.
Historical use for urinary incontinence in spayed female dogs
None available in the US
Dogs
DES, Diethylstilbestrolum, Stilbestrol, Stilboestrol, NSC-3070
Endocrine
Yes
Not safe for use in pregnant or lactating animals.
Bone marrow toxicity, GI effects, mammary cancers, uterine disease, feminization in males
Diethylstilbestrol is a synthetic estrogen hormone that was historically used in the treatment of urinary incontinence in female dogs and benign prostatic hypertrophy (prostate enlargement) in male dogs. The use of diethylstilbestrol for the prevention of pregnancy is not recommended due to potential serious side effects.
The use of diethylstilbestrol in general has become controversial with the FDA approval of the drug estriol (Incurin).
Diethylstilbestrol binds to the estrogen receptors in the tissues of the body, including the reproductive tract and urinary tract (bladder).
Dogs: 0.1-1 milligram per dog by mouth for 3-5 days, then taper to every other day, then taper to lowest effective dose (typically 1-3 times per week).
Stilbestrol tablets for oral use in 0.5 and 1 milligram sizes. (Canada)
Tablets should be stored at room temperature in a tight container. Keep out of the reach of children and measures should be taken to prevent exposure in pregnant women due to risks to the fetus.
Reduced urine leaking or dribbling incontinent spayed female animals, reduces prostate size in male dogs.
If a dose is missed, continue with the next dosage at the scheduled time.
No information available regarding acute toxicity or overdose in veterinary medicine. Contact your veterinarian or poison control if you believe your pet received an overdose of diethylstilbestrol.
May include:
Avoid use in:
*Antifungal medications can increase estrogen levels.
*Cimetidine, erythromycin and clarithromycin may decrease the metabolism of estrogen.
*Phenobarbital and phenytoin may decrease estrogen concentrations.
*Rifampin may decrease estrogen levels.
*The activity of anticoagulants such as warfarin may be decreased by estrogen.
*Estrogen may enhance the effects of corticosteroids.
*Estrogens may diminish the therapeutic effect of levothyroxine, and an increase in levothyroxine dose may be needed.
*May decrease efficacy of tricyclic antidepressants (eg, amitriptyline, clomipramine).
Use with caution in patients with liver disease, pre-existing anemia or low blood counts, and young patients. High doses can cause ovarian cancer in dogs.
Clients should use personal protective equipment (wear gloves and/or wash hands after touching) to minimize risk of exposure. Pregnant women should avoid handling DES.
CBC due to potential blood dyscrasias. Monitor thyroid levels closely in patients on thyroid supplementation.
Plumb’s Veterinary Drug Handbook
Manufacturer information: Ormond Veterinary Supply (Canada)
Disclaimer
The information contained on this page is for educational purposes only. This medication should only be given under the advice of a veterinarian who has examined your pet under the laws applicable to your state of residence.