Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have:
swelling of feet or lower legs, rapid weight gain;
muscle weakness, loss of muscle mass;
blurred vision, tunnel vision, eye pain, or seeing halos around lights;
bloody or tarry stools, coughing up blood;
unusual changes in mood or behavior;
a seizure;
increased pressure inside the skull--severe headaches, ringing in your ears, dizziness, nausea, vision problems, pain behind your eyes;
low potassium level--leg cramps, constipation, irregular heartbeats, fluttering in your chest, increased thirst or urination, numbness or tingling, muscle weakness or limp feeling;
pancreatitis--severe pain in your upper stomach spreading to your back, nausea and vomiting; or
increased adrenal gland hormones--weight gain in your face and shoulders, slow wound healing, skin discoloration, thinning skin, increased body hair, tiredness, mood changes, menstrual changes, sexual changes.
Common side effects may include:
increased blood pressure;
stomach pain, bloating;
facial redness;
acne, increased sweating;
sleep problems (insomnia);
pitting, scars, or bumps under your skin;
stretch marks; or
increased hair growth of body hair.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
 Fludrocortisone side effects (more detail)
