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A drug allergy is an allergy to a drug, most commonly a medication, and is a form of adverse drug reaction. Medical attention should be sought immediately if an allergic reaction is suspected. An allergic reaction will not occur on the first exposure to a substance.
Anaphylactoid reaction, non-immune anaphylaxis, or pseudoanaphylaxis, is a type of anaphylaxis that does not involve an allergic reaction but is due to direct mast cell degranulation. [ 10 ] [ 42 ] Non-immune anaphylaxis is the current term, as of 2018, used by the World Allergy Organization [ 42 ] with some recommending that the old ...
The first is a local reaction of itchiness, eczema-like texture, indurated erythema on the skin at the injection site. The second is a generalized reaction that can show up as a skin lesion resembling a cyst. The localized reaction takes 4–14 days to develop and can take months to heal. [12]
The hereditary form (HAE) often goes undetected for a long time, as its symptoms resemble those of more common disorders, such as allergy or intestinal colic. An important clue is the failure of hereditary angioedema to respond to antihistamines or steroids, a characteristic that distinguishes it from allergic reactions. It is particularly ...
Anaphylaxis, swelling, sometimes flatulence and vomiting An allergic individual may not have any reaction to consuming food only prepared with egg yolk and not egg white, or vice versa. [10] Due to high protein content, egg white allergy is more common than the reverse. [11] The majority of children with this allergy become tolerant by ...
Although less common than ICD, ACD is accepted to be the most prevalent form of immunotoxicity found in humans. [1] By its allergic nature, this form of contact dermatitis is a hypersensitive reaction that is atypical within the population. The mechanisms by which these reactions occur are complex, with many levels of fine control.
Pseudoallergy, sometimes known as nonallergic hypersensitivity, is a type of hypersensitivity reaction mostly described in the context of drug allergy.The mechanism is somewhat similar to the type 1 hypersensitivity in the Gell and Coombs classification in that the effector cell is also mast cell.
Fixed drug reactions are common and so named because they recur at the same site with each exposure to a particular medication. [1] Medications inducing fixed drug eruptions are usually those taken intermittently.