Doctor insights on:
Duration Of Allergic Reactions
Depends: It depends on the individual. If you've never had a reaction, the first reaction may take several days of therapy to show up. If you've had a previous reaction, the next reaction will usually show up sooner, and greater, than the first reaction, so use caution if you've had a previous reaction. ...Read more
Allergies occur when your immune system is triggered by envirionmental factors it should ignore--for example, pollen in the air, or dander on a cat or dog--and creates cells to fight against them. An allergic reaction typically causes itching, congestion, or drainage, and ...Read more
Pretty quick..: It should be very quick........Get a more detailed answer ›
Varies: Most allergic reactions to medication occur after 1 or 2 doses but sometimes it can take a week or more to develop. ...Read more
Quickly: If a baby has a true allergy to its formula symptoms are going to occur with every feed. Crying from stomach cramping/colic, copious spitting up, change in bowel habits… Some of the symptoms occur so quickly sometimes babies can't even finish a feed without getting irritable/crying, that leads to poor feeding and poor growth. ...Read more
Can vary: Allergic reactions from taking antibiotics can be an immediate event or can take days to develop. When they take a longer period of time, we call them "delayed hypersensitivity reactions". If there is a concern about an allergy to a medication, it is best to speak with the prescribing physician about what to do next. All the best! ...Read more
Not very long: With food allergies hives either alone or as the first symptom of a more serious life-endangering condition called anaphylaxis typically appear within 5 minutes to 2 hours after the first bite. When appearing in a few minutes hives usually appear around the lips, eyes, face & neck. When 1st appearing after 2 hours hives can appear anywhere. Hives may be delayed as long as 8-12 hours after eating. ...Read moreSee 1 more doctor answer
Usually fast: Most common allergic reactions to pollen, insect stings, foods, etc., are immediate hypersensitivity reactions, meaning they occur within seconds to minutes. But you can also have a late phase, a second-wave of reaction that occurs hours later. Contact allergies (poison ivy, nickel allergy, e.g.) and some medication allergies are delayed, and may take hours, days, or weeks. ...Read more
- Talk to a doctor live online for free
- How long does it take for an allergic reaction to antibiotic to show up?
- How long does an allergic reaction take to clear up?
- How long does it take for uti to show up?
- Ask a doctor a question free online
- How long does it take for clamidia to show up?
- How long does it take for chlamydia to show up?
- How long does it take for trichomoniasis to show up?
- How long does it take gonorrhea to show up?
- Talk to a dermatologist online