This may be a little long.. but I thot it was amusing (or terrifying).
No one website provided this entire list, I merged and edited a few.
My favorite is "... this is not a complete list."
You will not get all, or even most, of these side effects, but they are possible. This is not a complete list.
an allergic reaction (difficulty breathing; closing of your throat; swelling of your lips, tongue, or face; or hives);
a weakened immune system in general, leaving you open to infection
sensitivity to sunlight - avoid too much sun
heat intolerance
"moon face" - a swollen, rounded facal shape
sodium retention, fluid retention, edema (swelling)
congestive heart failure, from "steroid myopathy"
potassium loss, alkalosis (increased alkalinity such as sodium, in the blood)
hypertension - high blood pressure (severe headache or blurred vision)
muscle weakness, loss of muscle mass
osteopenia - loss of bone density, osteoporosis - extreme loss of bone density ;bone and joint changes osteoporosis
tendon rupture, especially of the Achilles tendon
spinal compression fractures
aseptic necrosis of femoral and humeral heads - severe knee and hip joint problem, possibly requiring replacement joints
chronic fractures of your long bones
peptic ulcer with possible perforation and hemorrhage
nausea, vomiting
anorexia, weight loss
increased appetite, weight gain, sudden weight gain (more than 5 pounds in a day or two)
diarrhea or constipation
pancreatitis - inflamed pancreas
abdominal distention - swelling of the stomach
ulcerative esophagitis - inflammation of the esophagus (tube that leads to your stomach), with sores
slow wound healing
thin, fragile skin
petechiae - blood spots on the skin
ecchymoses - black and blue pools of blood under the skin from ruptured blood vessels
facial erythema - abnormal redness of the facial skin
hirsutism - abnormal hair growth
acne
urticaria - hives
heavy sweating
headache
convulsions
vertigo
neuritis - impaired or lost reflexes
paresthesias - sensation of numbness, tingling or burning
menstrual irregularities
Cushingoid state
failure of adrenal gland to produce enough hormones in times of stress
stunted growth in children
hypercholesterolemia - high cholesterol
low carbohydrate tolerance
adult onset diabetes
increased need for insulin in diabetics
hypoglycemia - low blood sugar
cataracts
increased pressures in the eye
glaucoma, with possible damage to the optic nerves
secondary eye infections due to fungi or viruses
exophthalmos - abnormal bulging out of the eyeballs
hallucinations
psychosis
euphoria, mood changes
accelerated atherosclerosis - coronary artery disease
heart arrhythmias due to potassium deficiency
syncope - fainting
necrotizing angiitis - serious inflammation of blood vesssels or lymph ducts
night sweats, nightmares, insomnia