How long does it take to see improvement with allergy injections?
Most pets will respond to immunotherapy (allergen-specific injections) within 6-9 months, but some will require up to a year before total benefits are appreciated. Roughly 70% of animals with environmental allergies (atopic dermatitis) respond to these injections; however, responses can vary. During the induction phase of immunotherapy, most all pets will need the benefits of other medications to make them feel comfortable (eg, antihistamines, steroids, shampoos, etc.). Once the injections take effect about a third of pets respond very well to injections without the need of many other medications, another third respond well but will require other medications during their worst time of the year, while the last third will require all other medications but hopefully at a reduced dose and frequency of administration. This means that about 30% of animals with environmental allergies alone do not respond to immunotherapy.
