I'd confirm with the doctor rather than relying on my googling skills and limited knowledge.. however... says
What are the possible side effects of prednisone?
• If you experience any of the following serious side effects, stop taking prednisone and seek emergency medical attention or contact your doctor immediately:
· an allergic reaction (difficulty breathing; closing of your throat; swelling of your lips, tongue, or face; or hives);
· increased blood pressure (severe headache or blurred vision); or
· sudden weight gain (more than 5 pounds in a day or two).
• Other, less serious side effects may be more likely to occur. Continue to take prednisone and talk to your doctor if you experience
· insomnia;
· nausea, vomiting, or stomach upset;
· fatigue or dizziness;
· muscle weakness or joint pain;
· problems with diabetes control; or
· increased hunger or thirst.
• Other side effects that occur only rarely, usually with high doses of prednisone, include
· acne,
· increased hair growth,
· thinning of the skin,
· cataracts,
· glaucoma,
· osteoporosis,
· roundness of the face, and
· changes in behavior.
• Side effects other than those listed here may also occur. Talk to your doctor about any side effect that seems unusual or that is especially bothersome.
Steroids are known to cause weight gain.. it's why all the athletes have been known to take them, it's supposed to reduce swelling, not increase it... Please do call the doctor...