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Doctor insights on: Duration Of Allergic Reactions

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How long can an allergic reaction take to show up on penicillin based anibiotics?

How long can an allergic reaction take to show up on penicillin based anibiotics?

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

Dr. John Chiu
2,630 Doctors shared insights

Allergies (Definition)

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


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Please tell me how long it takes for to show signs of an allergic reaction from medication?

Please tell me how long it takes for to show signs of an allergic reaction from medication?

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

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How long does it take for an allergic reaction to show up on your skin?

How long does it take for an allergic reaction to show up on your skin?

Depends: Hives or urticaria can occur within minutes on skin contact or ingestion of a food allergen, while contact dermatitis from poison ivy or nickel may take 48 hours. ...Read more

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How long would it take for allergic reaction to baby formula show up in a six week old?

How long would it take for allergic reaction to baby formula show up in a six week old?

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

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I'm just wondering, if your lips have an allergic reaction, how long does it take to show up?

I'm just wondering, if your lips have an allergic reaction, how long does it take to show up?

Allergic reaction: I am not sure I get your question right, did you actually develop a lip reaction already? If so, head to the nearest urgent care place to get it looked at and treated. ...Read more

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How long does it take for hives to show up from allergic reaction to antibiotic?

How long does it take for hives to show up from allergic reaction to antibiotic?

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

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How long does it take for an allergic reaction like hives to show up after eating something?

How long does it take for an allergic reaction like hives to show up after eating something?

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

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How long will an allergic reaction to electrodes from a heart monitor take to show up?

Usually immediate: An allergic reaction to the electrodes (the stickiness and/or tape) would be found out soon after they are removed and you will see an allergic ring or redness and irritation at the site. ...Read more

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How long does an allergic reaction take to kick in?

How long does an allergic reaction take to kick in?

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

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How long does it take for an allergic reaction appear?

Depends: 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

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Please tell me how long it takes for to choke from an allergic reaction?

Please tell me how long it takes for to choke from an allergic reaction?

Quickly: Allergic reactions can occur quickly and are potentially life threatening. Call 911 if having severe symptoms or rapidly increasing symptoms. ...Read more

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Can someone tell me how long will it take for an allergic reaction to clear up?

Can someone tell me how long will it take for an allergic reaction to clear up?

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

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How long would it take for allergic reaction to take place and how long would it last?

How long would it take for allergic reaction to take place and how long would it last?

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

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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

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If I was going to have an allergic reaction to something typically hiw long would it take to see the reaction?

Depends on type: The vast majority of food reactions occur within 2 hours after ingestion, although there are exceptions. Drug reactions may take several days to appear or come after the medication is stopped. Allergic contact skin reactions, such as poison ivy, take 8 to 96 hours. ...Read more

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How long does a breakout from a allergic reaction take to heal?

How long does a breakout from a allergic reaction take to heal?

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

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How long does it take for the swelling to go down after a allergic reaction?

How long does it take for the swelling to go down after a allergic reaction?

Swelling: It may take a few days for the skin swelling to subside and then the skin will need extra few days to heal from the swelling, it may peel as well. ...Read more

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How long would it take for an allergic reaction to occur to antibiotics?

How long would it take for an allergic reaction to occur to antibiotics?

Immed or 7-10 days: Paitents may exhibit immediate or delayed type hypersensitivity which can range from immediate symptoms to those delayed by 10 days. ...Read more

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How long does it usually take an allergic reaction rash to go away?

How long does it usually take an allergic reaction rash to go away?

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

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I have an allergic reaction on my face. How long will it take to go away?

I have an allergic reaction on my face. How long will it take to go away?

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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How long does it take get over an allergic reaction to a certain type of food?

How long does it take get over an allergic reaction to a certain type of food?

Relatively Quickly: Food allergy reactions typically occur very quickly and if treated promptly resolve quickly as well. Depending upon the severity of the reaction one would expect resolution of symptoms over the course of hours and if very severe it may take days. ...Read more

Dr. John Chiu
1,043 Doctors shared insights

Allergic Reaction (Definition)

Sensitivities to substances, called allergens, that come into contact with the skin, nose, eyes, respiratory tract, and gastrointestinal tract. They can be inhaled into the ...Read more