When taking conjugated estrogens, you might feel some side effects. The most common of which include nausea, gas, stomach pain, headaches, back pain, depression, insomnia, breast pain, vaginal itching or discharge, or changes in your menstruation.
Rarer side effects, such as jaundice, chest pain or pressure, slurred speech, vision/balance problems, swelling or tender stomach area, and high levels of calcium in your blood, should be reported to your doctor immediately. These symptoms could be a sign that your body is reacting poorly to the medication.
Your body could also end up being allergic to the medication. When this situation occurs, your body will typically react to conjugated estrogens with hives; an inability to breathe well; or a swollen face, lips, tongue, or throat. Treat any of these symptoms immediately with emergency medical help.