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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
2,390 doctors shared insights

Allergies (Definition)

Essentially allergies occur when your immune system goes crazy and decides to has to fight against things it should be ignoring. The immune system of people without allergies simply ignores the pollen in the air or the dander on their cat while an allergic person's immune system creates cells to fight against the pollen or dander. The allergic reaction causes the ...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 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

Dr. John Chiu
977 doctors shared insights

Allergic Reaction (Definition)

Allergic reactions are 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