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Doctor insights on: How Long For Allergic Reaction To Penicillin

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Dr. John Chiu
2,661 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 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 do penicillin allergy hives take to clear?

How long do penicillin allergy hives take to clear?

Varies: Hives due to drug allergy usually improve within a day or two of stopping the medicine but can last as long as a week or two. It is best to call the doctor to determine what treatment is needed. ...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 a penicillin allergy rash take to clear?

How long does a penicillin allergy rash take to clear?

Up to 30 days: Drug allergies can resolve in a few days and may persist for several weeks until the residual penicillin by products are cleared from body. ...Read more

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Allergic reaction to pineapple how long it lasts?

Hours: Nearly all food reactions subside in less than a day. ...Read more

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On average, how long will an allergic reaction to food last?

Allergic reactions: Food allergic reactions typically begin within 30 munutes of an ingestion and typically peak at about 30 minutes after they begin. The reaction may be short lived, lasting only a few hours (typical) or long-last; possibly for days (rare). ...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 much antihistamine for allergic reaction?

How much antihistamine for allergic reaction?

depends on product: For children over 12 years old, the usual dose for Claritin and zyrtec is 10 mg a day, for xyzal (levocetirizine) and Clarinex 5 mg a day, while the dose for Allegra is 180 mg once a day or 60 mg twice a day. Pediatric doses are based on age rather than weight. There are dose adjustments for liver and kidney disease. ...Read more

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How long can it take for an allergic reaction to occur after taking antibiotics?

How long can it take for an allergic reaction to occur after taking antibiotics?

Quick: True allergic reactions typically happen after the first dose. Other reactions can occur later in the course. ...Read more

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How long does it take to recover from a severe allergic reaction to antibiotics?

How long does it take to recover from a severe allergic reaction to antibiotics?

Depends: on the reaction, which can range from some rash to full anaphylactic shock to other complications, first step is to stop the medicine, at times it might take weeks for the rash to go away with certain antibiotics, just keep away from direct sunlight as much as you can while you have the rash, follow up with your pcp/allergist, goodluck ...Read more

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How long does an allergic reaction to a vaccine last?

How long does an allergic reaction to a vaccine last?

Vaccine reactions: The duration of an allergic reaction to a vaccine depends on the type of allergic reaction and on the person having the reaction. Reactions like classic allergies, ie hives or "urticaria" may last a few days, whereas those that are more serum sickness-like, with joint pains, sometimes last longer, like weeks or months, and require treatment with steroids. Most reactions are short-lived. ...Read more

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How can I avoid another allergic reaction to an antibiotic medicine if allergic to penicillin?

How can I avoid another allergic reaction to an antibiotic medicine if allergic to penicillin?

Avoidance: If one is allergic to penicillin then avoidance of penicillin like medications is a requirement. Other classes of antibiotics should be fine but because an individual has one drug allergy they may be at risk for reactions to other classes of drugs. One should also be very clear that moving forward that antibiotics are needed. ...Read more

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How long will hives last if i'm having an allergic reaction to medication?

How long will hives last if i'm having an allergic reaction to medication?

Less than one week: Typically, hives due to a medication will last for only a few days; two weeks tops. Medications that stay in the body for a few days could cause longer reactions. Adverse reactions to medications should always been discussed with and shown to the prescribing physician, so that the true cause is identified, and your chart is marked so you aren't given that medication again in the future. ...Read more

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How long until i see the effects of prednisone for an allergic reaction to cephalexin , severe rash?

A few days: You should start seeing improvement hopefully within a few days. Using a topical steroid cream with the oral steroid can also help quicken recovery. If it is not improving, let your physician know. ...Read more

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About how long does it take a rash due to allergic reactions to cats to heal?

About how long does it take a rash due to allergic reactions to cats to heal?

Hours to days: If the rash you have is from a recent and brief exposure, if you have some topical benedryl cream, it should resolve relatively quickly. If you have had prolonged exposure, you might need to add a topical steroid for relief. This might take a couple of days. Finally, if the rash is infected, see your doctor as that might not heal on its own. ...Read more

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How long can swelling from an allerigic reaction to shellfish last?

How long can swelling from an allerigic reaction to shellfish last?

It depends: It depends on where the swelling is located. If you had a severe allergic episode, swelling in mucous membranes can sometimes last several days. ...Read more

Dr. John Chiu
1,052 doctors shared insights

Allergic Reaction (Definition)

A sensitivity to substances called allergens that come into contact with the skin, nose, eyes, respiratory tract, or gastrointestinal tract. They can be breathed into the ...Read more