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Doctor insights on: Allergic Reaction Take

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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

Dr. John Chiu
2,638 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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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 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

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How long will bruising from allergic reaction take to get better?

How long will bruising from allergic reaction take to get better?

Shouldn't take long: Hours to a day, but if there is vasculitis, inflammed tiny vessels, it might take longer to disappear ...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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If I get severe irritability when I take benadryl (diphenhydramine) is it still ok to take occasionally when having an allergic reaction? Safe to take?

If I get severe irritability when I take benadryl (diphenhydramine) is it still ok to take occasionally when having an allergic reaction? Safe to take?

Appears safe.: If irritability is your only side effect it is apparently not a physical threat. Are you able to tolerate the irritability without threatening your livelihood, family, or significant relationships? There are other antihistamines. ...Read more

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I was prescribed prednisone for severe allergic reaction, should I take it till the rash is gone or till the prescription is gone?

Prednisone: Follow the prescription exactly as written since you can have a recurrence or a flare if the Prednisone is stopped before the recommended treatment or tapering course. ...Read more

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Bug / insect bites with allergic reaction. Can I take hydrocortisone and Benadryl (diphenhydramine) to cure?

Bug / insect bites with allergic reaction. Can I take hydrocortisone and Benadryl (diphenhydramine) to cure?

INSECT BITE ALLERGY: It depends on the allergic reaction. If it is only itchy bumps, hc cream or other steroids plus Benadryl (diphenhydramine) intake will suffice. If the reaction is severe like anaphylactic shock or angioedema, you need Epipen shots or call 911. ...Read more

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How much time does a allergic reaction to hair dye take to occur?

How much time does a allergic reaction to hair dye take to occur?

24-96 hours: Contact reactions to hair dye are similar to that of poison ivy although the distribution is usually limited to the scalp, neck, shoulders and sometimes upper chest. It falls under the category of a type IV hypersensitivity reaction. This is different than a reaction to pollen or pets which cause immediate symptoms (minutes to a few hours) called a type I reaction. It appears in 24-96 hours. ...Read more

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Have low t. Was using patch but allergic reaction. What can I take until I see doc. Again was starting to feel differently don't want feel down again?

Have low t. Was using patch but allergic reaction. What can I take until I see doc. Again was starting to feel differently don't want feel down again?

Depends on severity: Could use small amount of hydrocortisone under pach before application. Let it dry thoroughly before applying patch. Also rotate spots. Also most of medicine is gone in 12 hous, so u may want to remove patch then. ...Read more

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I'm allergic to Benadryl (diphenhydramine) and im having an allergic reaction what can I take?

I'm allergic to Benadryl (diphenhydramine) and im having an allergic reaction what can I take?

Benadryl (diphenhydramine) allergy: Kind of rare, but present, can try other OTC antihistamines as cetirizine, loratadine or fexofenadine, might still get sedated but to a lesser extent than diphenhydramine (benadryl) so be careful when you drive or operate machinery ...Read more

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Is it possible to take allergic reaction to 100mg atenonal, lungs fill up with fluid, and out of breath.

Is it possible to take allergic reaction to 100mg atenonal, lungs fill up with fluid, and out of breath.

Yes: The medication atenolol which I believe you may be referring to, is a beta-blocker type medication used for treating high blood pressure, etc. Any medication can trigger an allergic reaction and these can be severe. Beta-blocker medications can trigger asthma symptoms in those with or susceptible to asthma. ...Read more

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Did I have an allergic reaction to msg? I take mirapex. 5mg for rls. While eating a chinese meal I became violently ill within a minute - lost all color, sweat profusely, skin cold and clammy, was incoherent, extreme nausea and profound sick feeling, no

Did I have an allergic reaction to msg? I take mirapex. 5mg for rls. While eating a chinese meal I became violently ill within a minute - lost all color, sweat profusely, skin cold and clammy, was incoherent, extreme nausea and profound sick feeling, no

Sounds like MSG: Reaction, also called chinese restaurant syndrome. Results from severe vasodilation of blood vessels as an idiosyncratic/exaggerated response to msg (everybody gets at least a little of that if the dose is high enough, some are very sensitive to even small amounts). I don't think the RLS or the Mirapex (pramipexole) are related, but you could share the story with your doc. Some asian places don't use msg. ...Read more

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I had a wheatgrass shot then some carrot juice with banana. I'm having nausea and headache. Could it be an allergic reaction? Should I take Benadryl (diphenhydramine)?

I had a wheatgrass shot then some carrot juice with banana. I'm having nausea and headache. Could it be an allergic reaction? Should I take Benadryl (diphenhydramine)?

Possible: But some wheatgrass are infested with insects or their eggs as well. If you have itching, then allergy is a more likely scenario. If not, it is difficult to tell for sure. Don't touch these products again until after you have talked to your doctor. If you still have the wheatgrass and had tolerated banana and carrot before. Save a sample of the wheat grass in case it needs be examined. ...Read more

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I wish to know what to take for a allergic reaction?

I wish to know what to take for a allergic reaction?

Treating allergies: A true allergic reaction that is not severe will respond to antihistaines. More severe reaction require more sophistacted treatment from an md or do. Avoiding what causes the allergy is always the first step. ...Read more

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What to take for an allergic reaction to unknown food?

What to take for an allergic reaction to unknown food?

Allergies: It depends on the symptoms? Go to the er if they are bad or you had a previous history of a bad reaction. Don't take a chance. For a mild skin reaction take antihistamines. ...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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How much time would it take for an allergic reaction to happen?

Timing/allergic rxn: An allergic reaction due to an ingestion (food, medications) can occur within minutes up to approximately 6 hrs. Reactions to skin contacts (poison Ivy, chemicals, etc) can occur 24-96 hours after exposure. ...Read more

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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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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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After discontinuing medication due to allergic reaction, how long does it take to get out of system?

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 do I know if I'm having an allergic reaction to something and would it be ok to take 3 beenedryl for a minor reaction?

How do I know if I'm having an allergic reaction to something and would it be ok to take 3 beenedryl for a minor reaction?

Allergic Reaction: Not sure what you mean by allergic reaction. If you are referring to anaphylaxis (hives, swelling, vomiting, shortness of breadth, etc) then epinephrine is the treatment of choice, call 911. Allergic rhinitis (congestion, sneezing, eye itch) is treated with OTC antihistamines, nasal sprays, saline rinses, etc. See an Allergist first to determine exactly what you are allergic to. ...Read more

Dr. John Chiu
1,044 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


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