After ascertaining that what you do have is eczema, there are two kinds of medicines that will be given to you by a doctor or at a hospital. One to take away the itching and the other will be anti-inflammatory drugs. The standard that you will get is a prescription anti-steroid cream and an antihistamine treatment. You may get some doctors orders to restrict food for a while but those have been proven to work in most cases. Skin drying agents are also sometimes prescribed but they are usually also known not to work as much. If the eczema is not responsive to this, there are other treatments that may be tried including PUVA, coal tar and even chemotherapy.
Based on the kind of rash, there are three kinds of courses that doctors prescribe. A non serious eczema is set right by a dose of antihistamines. They are not heavy medicines. One can just take one and get on with the day. The more serious cases are given corticosteroids which is a short course as it has quite a few side effects. A long course has too many bad qualities. This is only because the eczema is severe. In addition an antibiotic or a anti-fungal cream is also given in case there may be an infection.