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Contraindications include current, past or suspected breast cancer, known or suspected estrogen-dependent malignant tumours, previous idiopathic or current venous thromboembolism, known coronary heart disease, and porphyria cutanea tarda (absolute contraindication).
In medicine, a contraindication is a condition or factor that serves as a reason to withhold a certain medical treatment due to the harm that it would cause the patient. Contraindication is the opposite of indication, which is a reason to use a certain treatment. Absolute contraindications are contraindications for which there are no reasonable circumstances for undertaking a course of action.