Prednisone is a highly efficient corticosteroid used in people with low corticosteroid levels. Other conditions for which your health care provider may recommend prednisone include lupus, multiple sclerosis, arthritis and severe allergic reactions. It's important for you to know that prednisone can affect your immune system and decrease the ability of your body to fight infection. This means that if you get an infection you may not feel any symptoms of it, which is very dangerous. If you think you have been around people with some diseases like chicken pox talk to your doctor as soon as possible to learn about your risks. Just like any other drug prednisone may cause side effects. These can include any of the following: increased hair growth, headache, irregular menstrual periods, weak muscles, insomnia, fragile skin, dizziness, heartburn, extreme tiredness, bulging eyes, acne, decreased sexual desire, mood swings, and increased sweating. More serious side effects that you should be aware of and report to your health care provider as soon as possible include hives, signs of infection, upset stomach, depression, vomiting, sore throat, seizures, trouble breathing and swallowing, lightheadedness, confusion, itching, sudden weight gain, shaking of the hands, numbness, burning, or tingling, eye redness, irregular heartbeat, vision problems, fever, rash, shortness of breath, and some other ones. For the full list of possible side effects consult your pharmacist or read the label.