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Drug Interactions between C1 esterase inhibitor (human) and Merzee

This report displays the potential drug interactions for the following 2 drugs:

  • C1 esterase inhibitor (human)
  • Merzee (ethinyl estradiol/norethindrone)

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Interactions between your drugs


ethinyl estradiol C1 esterase inhibitor, human

Applies to: Merzee (ethinyl estradiol / norethindrone) and C1 esterase inhibitor (human)

C1 esterase inhibitor, human can occasionally cause dangerous blood clots, and using it together with ethinyl estradiol may increase the risk. Also, the risk is increased with age, cigarette smoking, high blood pressure, or high cholesterol. Blood clots can lead to complications such as heart attack, pulmonary embolism (blockage of an artery in the lung), and stroke. Talk to your doctor if you have any questions or concerns. Your doctor may be able to prescribe alternatives that do not interact, or you may need a dose adjustment or more frequent monitoring to safely use both medications. You should seek immediate medical attention if you experience potential signs and symptoms of blood clots such as chest pain; shortness of breath; difficulty breathing; coughing up blood; sudden loss of vision; pain, redness or swelling in an arm or leg; and numbness or weakness on one side of the body. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medications without first talking to your doctor.

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Drug and food interactions


norethindrone food

Applies to: Merzee (ethinyl estradiol / norethindrone)

Grapefruit juice may increase the blood levels of certain medications such as norethindrone. You may want to limit your consumption of grapefruit and grapefruit juice during treatment with norethindrone. However, if you have been regularly consuming grapefruit or grapefruit juice with the medication, then it is advisable for you to talk with your doctor before changing the amounts of these products in your diet, as this may alter the effects of your medication. Contact your doctor if your condition changes or you experience increased side effects. Orange juice is not expected to interact.

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ethinyl estradiol food

Applies to: Merzee (ethinyl estradiol / norethindrone)

Information for this minor interaction is only available at a professional reading level.

For clinical details see professional interaction data.

Therapeutic duplication warnings

No warnings were found for your selected drugs.

Therapeutic duplication warnings are only returned when drugs within the same group exceed the recommended therapeutic duplication maximum.

Drug Interaction Classification

These classifications are only a guideline. The relevance of a particular drug interaction to a specific individual is difficult to determine. Always consult your healthcare provider before starting or stopping any medication.
Major Highly clinically significant. Avoid combinations; the risk of the interaction outweighs the benefit.
Moderate Moderately clinically significant. Usually avoid combinations; use it only under special circumstances.
Minor Minimally clinically significant. Minimize risk; assess risk and consider an alternative drug, take steps to circumvent the interaction risk and/or institute a monitoring plan.
Unknown No interaction information available.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.