For cats with this type of problem, I usually use the steroid injection every 2 weeks for 3 doses in a row to break the cycle of itching. At my clinic, if we have recently examined the cat, we allow our technicians to give the injections at a "tech appointment", so you don't have to pay a dr./exam fee each time. Remember, you have the option of oral steroids too, which should be a lot cheaper. in fact, prednisone is available at most chain pharmacies for the 4$/month price that a lot of pharmacies are offering on their generic drugs. Any human pharmacy will fill an Rx for a pet (but you can't bill your insurance) :)
Steroids can make pimples pop up and hair fall out. They can make guys grow breasts and girls grow beards. Steroids can cause livers to grow tumors and hearts to clog up. They can even send users on violent, angry rampages. In other words, steroids throw a body way out of whack. Steroids do make users bulk up, but the health risks are high. It's true, on steroids biceps bulge; abs ripple; and quads balloon. But that's just on the outside. Steroid users may be very pleased when they flex in the mirror, but they may create problems on the inside. These problems may hurt them the rest of their lives. As a matter of fact steroid use can shorten their lives.