Histamine
The primary allergen is a protein called Fel d 1 that is produced by cat saliva and sebaceous glands, which causes either an allergic or asthmatic response.
Any drug can provoke allergic response. Every one is unique and different. So some individuals give individual response to the given drug. All the drugs can give allergic response in some individuals. Some drugs are more prone to give allergic response. No drug is designed to give an allergic response. It will not be called as drug in that case.
An allergic response is a response of the immune system to some form of allergen. It may take the form of itching, inflammation, or tissue injury.
Allergic Response
(The response that the immune system displays when first exposed to an antigen.) (medical-dictionary.thefreedictionary.com/primary+response)
kw killer. sr crue
anaphylactic shock
It's general biochemical name is an Antigen - anti = against and gen = genesis.
an allergic reaction
An allergic response is an immune over reaction to a harmless allergen such as pollen which will adversely affect the host, when the allergen is pollen this causes hayfever.
Hives are a common allergic response yes.
antigen