Generic Name: conjugated estrogens (oral) (KON joo gay ted ES troe jenz)
Brand Names: Enjuvia, Premarin
What is Premarin?
Premarin tablets contain conjugated estrogens, a mixture of estrogen hormones. Estrogen is a female sex hormone produced by the ovaries. Estrogen is necessary for many processes in the body.
Premarin is also used to replace estrogen in women with ovarian failure or other conditions that cause a lack of natural estrogen in the body.
Premarin is also used as part of breast cancer treatment in both women and men.
You should not use Premarin if you have: undiagnosed vaginal bleeding, liver disease, a bleeding disorder, if you have major surgery, or if you have ever had a heart attack, a stroke, a blood clot, or cancer of the breast, uterus/cervix, or vagina.
Do not use if you are pregnant.
Premarin may increase your risk of developing a condition that may lead to uterine cancer. Report any unusual vaginal bleeding right away.
Using this medicine can increase your risk of blood clots, stroke, or heart attack. Estrogen should not be used to prevent heart disease, stroke, or dementia. Long-term use may increase your risk of cancer of the breast, uterus, or ovaries.
Have regular physical exams and self-examine your breasts for lumps on a monthly basis while using Premarin.
Before taking this medicine
You should not use Premarin if you have:
unusual vaginal bleeding that has not been checked by a doctor;
a history of heart attack, stroke, or blood clot;
an increased risk of having blood clots due to a heart problem or a hereditary blood disorder; or
a history of hormone-related cancer, or cancer of the breast, uterus/cervix, or vagina.
Do not use Premarin if you are pregnant. Tell your doctor right away if you become pregnant during treatment.
Using this medicine can increase your risk of blood clots, stroke, or heart attack. You are even more at risk if you have high blood pressure, diabetes, high cholesterol, if you are overweight, or if you smoke.
Estrogen should not be used to prevent heart disease, stroke, or dementia, because this medicine may actually increase your risk of developing these conditions.
To make sure this medicine is safe for you, tell your doctor if you have ever had:
liver problems, or jaundice caused by pregnancy or taking hormones;
epilepsy or other seizure disorder;
endometriosis or uterine fibroid tumors;
hereditary angioedema (an autoimmune disorder);
porphyria (a genetic enzyme disorder that causes symptoms affecting the skin or nervous system);
a thyroid disorder; or
high levels of calcium in your blood.
Long-term use of Premarin may increase your risk of cancer of the breast, uterus, or ovaries. Talk with your doctor about this risk.
Estrogen lowers the hormone needed to produce breast milk and can slow breast milk production. Tell your doctor if you are breast-feeding.
How should I take Premarin?
Take Premarin exactly as prescribed by your doctor. Follow all directions on your prescription label. Do not take this medicine in larger amounts or for longer than recommended.
Premarin may increase your risk of developing a condition that may lead to uterine cancer. Your doctor may prescribe a progestin to take while you are using Premarin, to help lower this risk. Report any unusual vaginal bleeding right away.
Read all patient information, medication guides, and instruction sheets provided to you. Ask your doctor or pharmacist if you have any questions.
Premarin is sometimes taken on a daily basis. For certain conditions, the medicine is given in a cycle, such as 3 weeks on followed by 1 week off. Follow your doctor's instructions.
If you see what looks like part of a conjugated estrogen tablet in your stool, talk with your doctor.
Your doctor should check your progress on a regular basis to determine whether you should continue this treatment. Self-examine your breasts for lumps on a monthly basis, and have regular mammograms.
If you need major surgery with long-term bed rest, you may need to stop using this medicine for a short time. Any doctor or surgeon who treats you should know that you are using Premarin.
Store at room temperature away from moisture, heat, and light.
See also: Dosage Information (in more detail)
What happens if I miss a dose?
Take the missed dose as soon as you remember. Skip the missed dose if it is almost time for your next scheduled dose. Do not take extra medicine to make up the missed dose.
What happens if I overdose?
Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.
What should I avoid while taking Premarin?
Avoid smoking. It can greatly increase your risk of blood clots, stroke, or heart attack while using conjugated estrogens.
Premarin side effects
Get emergency medical help if you have signs of an allergic reaction to Premarin: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have:
signs of a blood clot - sudden vision loss, stabbing chest pain, feeling short of breath, coughing up blood, pain or warmth in one or both legs;
swelling or tenderness in your stomach;
jaundice (yellowing of the skin or eyes);
memory problems, confusion, unusual behavior;
unusual vaginal bleeding, pelvic pain;
a lump in your breast; or
Common Premarin side effects may include:
nausea, gas, stomach pain;
headache, back pain;
breast pain; or
vaginal itching or discharge, changes in your menstrual periods, breakthrough bleeding.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
See also: Side effects (in more detail)
What other drugs will affect Premarin?
Sometimes it is not safe to use certain medications at the same time. Some drugs can affect your blood levels of other drugs you take, which may increase side effects or make the medications less effective.
Many drugs can interact with conjugated estrogens. This includes prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible interactions are listed in this medication guide. Tell your doctor about all your current medicines and any medicine you start or stop using.
More about Premarin (conjugated estrogens)
- Side Effects
- During Pregnancy
- Dosage Information
- Drug Images
- Drug Interactions
- Compare Alternatives
- Support Group
- Pricing & Coupons
- En Español
- 46 Reviews – Add your own review/rating
- Drug class: estrogens
- Premarin (Conjugated Estrogens Injection)
- Premarin (Conjugated Estrogens Tablets)
- Premarin (Advanced Reading)
- Premarin Intravenous (Advanced Reading)
Related treatment guides
Where can I get more information?
- Your pharmacist can provide more information about Premarin.
- Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use Premarin only for the indication prescribed.
- Disclaimer: Every effort has been made to ensure that the information provided by Cerner Multum, Inc. ('Multum') is accurate, up-to-date, and complete, but no guarantee is made to that effect. Drug information contained herein may be time sensitive. Multum information has been compiled for use by healthcare practitioners and consumers in the United States and therefore Multum does not warrant that uses outside of the United States are appropriate, unless specifically indicated otherwise. Multum's drug information does not endorse drugs, diagnose patients or recommend therapy. Multum's drug information is an informational resource designed to assist licensed healthcare practitioners in caring for their patients and/or to serve consumers viewing this service as a supplement to, and not a substitute for, the expertise, skill, knowledge and judgment of healthcare practitioners. The absence of a warning for a given drug or drug combination in no way should be construed to indicate that the drug or drug combination is safe, effective or appropriate for any given patient. Multum does not assume any responsibility for any aspect of healthcare administered with the aid of information Multum provides. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the drugs you are taking, check with your doctor, nurse or pharmacist.
Copyright 1996-2018 Cerner Multum, Inc. Version: 11.01.
Date modified: February 08, 2018
Last reviewed: December 18, 2017