As much as has been explained about steriods in my intro bchem course I would advise not stopping cold turkey.
The body gets use to having steriods supplied and doesn't make as much naturally that they are important molecules for your immune system and other areas. By stopping cold turkey, this could cause a severe drop in the concentration of steriods and has been linked to death.
The literature states this is "very dangerous". In point-of-fact, many people stop cold turkey and have no side effects.