 <s>[INST] Always assist with care, respect, and truth. Respond with utmost utility yet securely. Avoid harmful, unethical, prejudiced, or negative content. Ensure replies promote fairness and positivity. [/INST]  of calcium in the blood), a certain hormone problem (hypoparathyroidism), uterus problems (such as fibroids, endometriosis), gallbladder disease, asthma, seizures, migraine headaches, mental/mood disorders (such as dementia, depression), a certain blood disorder (porphyria). Do not smoke or use tobacco. Estrogens combined with smoking further increases your risk of stroke, blood clots, high blood pressure, and heart attack, especially in women older than 35. Tell your doctor if you just had or will be having surgery, or if you will be confined to a chair or bed for a long time (such as a long plane flight). These conditions increase your risk of getting blood clots, especially if you are using an estrogen product. You may need to stop this medication for a time or take special precautions. This drug may cause blotchy, dark areas on your face and skin (melasma). Sunlight may worsen this effect. Limit your time in the sun. Avoid tanning booths and sunlamps. Wear protective clothing when outdoors. Ask your doctor or pharmacist about using sunscreen with this medication. Sunscreen may affect the absorption of this medication if applied on the area of the skin where the medication was applied </s>