Key takeaways
Premarin (conjugated estrogens) and Depo-Estradiol (estradiol cypionate) are both estrogen replacement medications, but they have some key differences. Premarin is available as an oral tablet and is used to treat menopausal symptoms, low estrogen levels due to other conditions, and certain types of cancers in advanced stages. It is also used to prevent osteoporosis, but it isn't usually a first choice. In contrast, Depo-Estradiol is an injection used primarily for treating menopausal symptoms, including severe hot flashes and low estrogen levels due to other conditions. Premarin can be taken daily or in cycles, while Depo-Estradiol is injected once a month. Premarin is made from estrogens found in the urine of pregnant horses, whereas Depo-Estradiol is a synthetic form of estrogen. Both medications can increase the risk of certain cancers, blood clots, and strokes. Premarin can cause headahces and different types of pain, including breast, stomach, and back pain, whereas Depo-Estradiol can cause pain or tenderness around the injection site area as well as headaches or mirgraines. Premarin and Depo-Estradiol are both only as a brand-name medication.
