Do not use ATOPICA in dogs less than six months of age or less than 4.4 lbs (2kg) in weight. ATOPICA is not for use in breeding dogs, pregnant or lactating bitches.The occurrence of adverse reactions is uncommon. Most common are vomiting and diarrhea. Generally are mild and transient and do not require the cessation of the treatment. Divided dosing or administration with a small amount of food may help to resolve. Other side effects are rare and may include lethargy or hyperactivity, anorexia, skin reactions such as lesions or change of hair coat, red and swollen pinnae, muscle weakness or muscle cramps. These effects generally resolve spontaneously after treatment is stopped.If any serious effects or other effects not mentioned occur, consult Veterinarian.