What is the definition or description of: nandrolone phenpropionate allergy?

See below: An allergy describes a systemic response of the body's immune system to an antigen. The response can cause hives,, itching, swelling, elevation of blood pressure and bronchoconstriction. An allergy to nandrolone phenpropionate would basically be any combination of the above reactions in response to the intake of that substance into the body.