Claim: The drug Premarin is produced from the urine of pregnant
horses.
Status: True.
Origins: One
of the inevitable aspects of the aging process in women is the
decreased production of the hormones estrogen and progestin. A 40%
to 60% drop-off in estrogen production generally occurs with the
onset of menopause (or after some types of hysterectomies).
Unfortunately, for many women these changes often are accompanied
by uncomfortable symptoms (such as hot flashes, night sweats, and
vaginal dryness), and estrogen loss is also linked to a significant
increase in the incidence of heart disease, stroke, and
osteoporosis.
Premarin (and Premarin-containing products such as Prempro,
Premphase, and Prempac) is a drug used in hormone replace therapy
HRT regimens prescribed for women to help lessen the symptoms of
menopause and reduce the risk of heart disease, stroke, and
osteoporosis. Premarin is available in several forms (pills,
creams, injections, patches) and, as the name (a shortening of the
phrase "pregnant mares' urine") suggests, contains conjugated
estrogens obtained from the urine of pregnant mares.
Premarin is not unique as an animal-derived drug, of course, as
generations of diabetics have been kept alive through injections of
purified insulin obtained from the pancreases of cattle and pigs.
No real alternative to animal insulin was available until 1982,
when the U.S. Food and Drug Administration approved the first
synthetic insulin, Humulin.
The continued use of Premarin has generated controversy because of
issues associated with the industrial use of animals required to
produce a supply of the drug; information regarding concerns over
the "pee line" collection of urine from mares to produce Premarin
is available on a number equine advocacy web sites. (Although
cattle and pigs were used as sources of insulin for diabetics,
those animals were not specifically raised to be insulin producers;
the insulin was obtained from animals raised and slaughtered for
the beef and pork markets.)
The development of generic alternatives (such as Estrace,
Estraderm, Ogen, OrthoEst, Estratab, Menest, Estinyl, Estrovirus,
and OrthoDienestrol) and synthetic estrogens (such as Cenestin) has
been cited as an advancement that eliminates the need for
animal-derived estrogens such as Premarin for most women.