DO NOT use the medication if you are allergic to it. If you experience any symptoms associated with allergies such as difficulty breathing, hives, swollen tongue etc., stop using the medication and seek urgent medical help.
Contact a medical specialist immediately if you experience any of the following: eye pain, blurred vision, seeing halos around lights; weight gain; swelling; shortness of breath; depression; extreme emotions; behavioral or personality changes; seizures; tarry or bloody stools; bloody cough; upper stomach pain spreading to the back; nausea and vomiting; accelerated heart rate; low potassium levels (characterized by irregular heart rate, confusion, thirst, larger volumes of urination, discomfort in the legs, muscle weakness or limpness); extremely high blood pressure (characterized by blurred vision, ear buzzing, anxiety, chest pain, shortness of breath, seizures and irregular heartbeat).
Common effects of using Prednisone include: insomnia, mood swings, gradual increase of weight, increased appetite, acne, heavier perspiration, dry skin, skin discoloration, bruising, slow healing of wounds, dizziness, headache, stomach pain, nausea, bloating, changed position or shape of body fat, especially in limbs and upper body.
Note that this list does not include all possible side effects. Other side effects might occur depending on individual health conditions.