If a plate with oceanic lithosphere meets another plate, the dense oceanic lithosphere dives beneath the other plate and sinks into the mantle: this process is called subduction. The sinking oceanic lithosphere drags the rest of the tectonic plate: this is the main cause of plate motion.
You may notice a decrease in symptoms during the build-up phase, but it may take as long as 12 months on the maintenance dose to notice an improvement. If allergy shots are successful, maintenance treatment is generally continued for three to five years.
Updated March 20, 2017. Allergy shots, or immunotherapy, are a series of injections that are given over many months to years and are not given as a single shot. What many refer to as a 3-month allergy shot,â on the other hand, represents a long-acting corticosteroid injection, such as triamcinolone (Kenalog). Many people swear by these long-acting steroid shots as a great way to get through their allergy season symptom-free.