What is the definition or description of: cyclobenzaprine hcl 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 cyclobenzaprine would basically be any combination of the above reactions in response to the intake of cyclobenzaprine into the body.