Definition

An allergic reaction to a medication means that the immune system is attacking the foreign substance, leading to allergic symptoms such as skin rash.

This type of allergy is independent of other illnesses, and generally lasts a lifetime.  

Pseudoallergic reactions – which frequently result from painkillers or anaesthetics – are not immune reactions, but result from the overreaction of cells in the body which. 

In rare cases the allergic or pseudoallergic reactions are caused by additives – such as colorants – in the medication.

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