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 more
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
Immedite type reactions can occur I minutes.
Contact allergies can take several days to show itself.
Some drugs reactions can appears as long as 2 weeks after stopping the antibiotic and can persist for up to 6 months.
Some sensitivities will not show at the first exposure, will show only with subsequent exposures. ...Read more
Quickly: Allergic reactions can occur quickly and are potentially life threatening. Call 911 if having severe symptoms or rapidly increasing symptoms. ...Read more
Depends: Most food allergic reactions will subside in 1-2 days depending on treatment. Poison ivy contact dermatitis allergic reaction can sometimes take a few weeks. Most drug allergic reactions improve after a few days depending on how fast the body "metabolizes" the drug and it stays in the system. ...Read more
Variable: All I can say is variable. Once someone has developed an allergy to something a reaction will take place fairly quickly after exposure. As long as you continue to be exposed the reaction will continue. Once you stop exposure then the reaction will often slowly ramp down but may require steroids (topical or systemic). ...Read more
How long: Minutes to hours. Depends how bad it is and how allergic you are. ...Read more
After discontinuing medication due to allergic reaction, how long does it take to get out of system?
Prolonged allergy: All drugs clear your system at different rates. While many clear the bloodstream quickly along with their therapeutic effects, it only takes a tiny bit bound up in your tissues or blood to continue an allergic reaction. Also, once begun an allergic reaction may persist even after the initial cause is cleared. Because of this allergic drug reactions may last days to weeks or longer. ...Read more
How long dose it take to have an allergic reaction to a medication if it is you're first time taking the medication?
Depends on severity: Minor allegic reactions, with local swelling and itching, usually resolve within 30 to 60 minutes. When someone has a more severe reaction, in which swelling or hives occur, sometimes the reactions take several days to resolve. As always, if you are ever having a reaction in which breathing is compromised or there is swelling in the throat, call 911 immediately. ...Read more
Swelling: If you are treated by your doctor or the er, not long. ...Read more
Hours to 2 days: Should go away within hours and rarely more than a day. ...Read more
How long is it supposed to it take for the allergic reaction to stop once the allergen is taken away?
Varies: If completely avoided minutes to hours.Get a more detailed answer ›
If someone was having a minor allergic reaction to something such as itching, how long does it take for the symptoms to start?
May be: Immediate or delayed for several hours or days, depending on the type of immune reaction and allergen. ...Read more
If I was going to have a server allergic reaction to medication and I stopped taking it how long would it take to find out if it was a bad one or mild?
See details: I depends on the half-life of the medication, In order words, how long the med stays in your system. ...Read more
A week: Drug reactions usually take 7-10 days to clear after stopping the medication. ...Read more
Variable: Hives or urticaria may wax and wane then resolve within a day or 2 after ingestion or contact with a food allergen. However, poison ivy or nickel allergic contact dermatitis may take 4-6 weeks to eventually resolve. The time to resolution is also impacted by what medications are taken such as oral corticosteroids such as prednisone, which can decrease the time significantly. ...Read more
Facial rashes: I suppose what you mean by allergic reaction on the face by saying you see new skin rashes on the face and you suspect it might be due to allergic reactions. Many things can cause facial rashes. Their natural histories are different. A face rashes can be due to hives, eczema, psoriasis, fungal infection, impetigo, cellulitis... You should see a doctor to get a correct diagnosis and prognosis. ...Read more
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