Side effects related to the use of generic Antara drug may include chest congestion or difficulty breathing, abdominal pain, back pain, headache, runny nose, diarrhea or constipation, nausea, body weakness, flu-like symptoms, unexplained muscle pain, tenderness, or weakness (especially if you have a fever or feel ill), nausea or vomiting, stomach pain, fever, passing brown or dark-colored urine, skin or the whites of the eyes turn yellow, feeling more tired than usual, itching, unexplained bleeding, bleeding that seems to take longer to stop, unexplained rash, chest pain, serious allergic reactions, high blood pressure (hypertension), infections, increased sun sensitivity, decrease in certain cells involved with the immune system, peripheral edema (swelling of the hands and/or feet), joint pain, muscle pain, migraine, dizziness, insomnia, depression, decrease in sexual desire, increased appetite, diabetes, anemia, weight gain, anxiety, dry mouth, pancreatitis (inflammation of the pancreas), skin rash or irritation.