90.8k views
2 votes
A severe allergic reaction will usually occur

within what time period following exposure to the
substance to which the patient is allergic?

2 Answers

5 votes
Between seconds and minutes
User NessDan
by
8.0k points
3 votes
Most severe allergic reactions occur within seconds or minutes after exposure to the allergen. Some reactions can occur after several hours, particularly if the allergen causes a reaction after it has been touched or eaten. In very rare cases, reactions develop after 24 hours.
User Azade Farshad
by
7.3k points
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