What is Premarin? Does it have harmful side effects like Prempro?
September 15, 2004 09:21

Premarin is a conjugated estrogen extracted from pregnant mares' urine (PMU). It is manufactured by Wyeth-Ayerst Laboratories, Inc., and is most commonly prescribed for estrogen replacement therapy (ERT) to relieve hormonal deficiency symptoms associated with menopause or hysterectomy. More recently, it has been prescribed to help prevent osteoporosis and heart disease. Marketed for the past 50 years, Premarin is the most widely used ERT drug and currently prescribed to more than nine million American women.