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It's general biochemical name is an Antigen - anti = against and gen = genesis.
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 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.
The potentially fatal allergic reaction is called anaphylaxisAnaphylaxis
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.
This substance has a general name called an antigen.
A combination of inhaled anesthetic gases and intravenous drugs are usually delivered during general anesthesia; this practice is called balanced anesthesia.
Tactile Anesthesia
An allergy is when a person's immune system perceives something that is usually harmless as a threat to the body and launches an attack called an immune response.
Some more context would be helpful. This question sounds like it may be asking about antigen exposure in the field of allergic disease, but it's hard to be sure. Hypersensitivity reactions (the immune system basis for allergies) are based on the principle that allergy follows initial sensitization to an antigen.
This response is called, photoperiodism.
decoding