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What Is Premarin®?

Hives may be an indication of a medication allergy.
Article Details
  • Written By: Tricia Ellis-Christensen
  • Edited By: O. Wallace
  • Last Modified Date: 03 August 2014
  • Copyright Protected:
    2003-2014
    Conjecture Corporation
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Premarin® is a medication that may be available in pill or cream form, and contains several types of estrogens. The company Pfizer manufactures this brand-name drug, but there are generic forms and a few other companies that synthesize this medicine from the collected urine of pregnant horses. A number of animal rights groups are opposed to collection methods and housing of mares used to create the medication, and the overall use of Premarin® has declined in recent years. This is not so much due to ethical objections, but more resulting from concerns about risks of using hormone replacement therapy.

The most common reasons to prescribe Premarin® are to alleviate symptoms associated with menopause. These include strong symptoms of vaginal dryness, mood changes, hot flashes, and others. In particular, the medicine may be recommended if women have total hysterectomies long before they would ordinarily experience menopause. In these cases, the medication or other hormone replacement therapies (HRT) could be recommended. Some women also take the drug during onset or after normal menopause when symptoms of declining estrogen become severe.

Dosage of this medicine in pill form is similar to the way birth control pills are dispensed. People may take it for a little over three weeks and then take a break of five days before starting it again. Cyclical dosing isn’t always used, and the dose dispensed depends on a patient’s medical condition.

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Important warnings about hormone replacement therapy apply to drugs like Premarin®. HRT elevates the risk for certain cancers of the breast and reproductive tract. It may be associated with higher risk for heart disease and blood clot disorders like stroke. People with family history of these cancers or elevated heart disease or stroke risk should not use this medicine. Those who do need to be especially vigilant in performing breast self-exams, and should report any changes or lumps felt to doctors.

Some side effects may occur with Premarin®. Women might note increase in body hair, nausea, headaches, and weight loss or gain. The breasts may become swollen or tender, libido may decrease, and women may have an increase in vaginal discharge. Other effects may include bloating in the stomach or cramping.

More severe adverse effects include jaundice or yellowing the skin and the whites of the eyes, which may indicate liver problems. Allergic reactions with hives, difficulty breathing and swelling of the face occasionally occur and is medically urgent. Severe migraines, very heavy menstrual bleeding, a sense of confusion or any suggestion of heart attack or stroke are indications to get medical help immediately.

Many drugs interact with Premarin®, including some antidepressants, some mood stabilizers, blood thinners, seizure drugs and certain forms of drugs for diabetes. It’s important to bring a full list of medications, including any herbal supplements or over the counter drugs, to the doctor’s so these can be evaluated before a prescription is given. Knowing personal and family medical history is also valuable in determining whether drugs like Premarin® are appropriate.

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