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Doctor insights on: How Long Does Hives Last From An Allergic Reaction

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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.

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Dr. John Chiu
2,606 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 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!

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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.

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How long for side effects or allergic reaction of sever hives from zithromax till it clears up? They keep reappearing its been 5 days. My daughter 5y

How long for side effects or allergic reaction of sever hives from zithromax till it clears up? They keep reappearing its been 5 days. My daughter 5y

15 days: The time for 1/2 of azithromycin (zithromax) to be eliminated from the body is approximately 3 days. Drugs generally stay in the body for 5 half lives after the last dose. Azithromycin will stay in her body for about 15 days after the last dose. An allergic reaction can continue until all of the drug is eliminated and for several days thereafter. See md for antihistamine or corticosteroid rx.

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I have had a allergic reaction (hives). I'm breakin out on my hands and vagina. (spread there last time) can it be an allergic reaction?

I have had a allergic reaction (hives). I'm breakin out on my hands and vagina. (spread there last time) can it be an allergic reaction?

Visit allergist: A physician should perform a physical exam and review your symptoms history and any medications you might be taking. They can recommend an aggressive antihistamine regimen including h1 and h2 antihistamines and might include a lt rc blocker such as singulair (montelukast).

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How long after taking stool softener would it take an allergic reaction, such as hives, to appear?

How long after taking stool softener would it take an allergic reaction, such as hives, to appear?

Depends: Stool softeners are rarely allergens although psyllium allergy has been reported. The onset of allergic reaction can be expected from minutes to 2 hours if you are allergic. However I think the hives are more likely from something else.

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What can cause hives besides an allergic reaction?

What can cause hives besides an allergic reaction?

Releasing histamine: Hives are due to a release of histamine in the skin, commonly due to allergy to foods, medicines, viruses, molds, animals, pollens, etc... Some people release histamine and get hives when exposed to cold temperatures, cold water, sunshine, stressful situations, etc... Other people with hives may have internal medical conditions such as chemical imbalances, intestinal parasites, etc...

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I just moved into a new house and I'm having an allergic reaction. I have hives all over my body. What should I do?

I just moved into a new house and I'm having an allergic reaction. I have hives all over my body. What should I do?

Take Benadryl (diphenhydramine): Hives can result for exposure to allergens and they can be treated with antihistamines wih or withou steroids. If notice this occurs only in your new home you may be able find the cause. An allergist may be able to help you to find the cause. Once the cause is known then you may be able to get your landlord to help eliminate the cause. For the most part the true cause of hives may not be found.

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What are good treatments for hives like allergic reaction?

What are good treatments for hives like allergic reaction?

Antihistamine: An antihistamine such as Diphenhydramine (benadryl) can help with symptoms. Hives can come and go for several days. I usually recommend using a once daily antihistamine such as claritin, zyrtec, or allegra, and using the Benadryl (diphenhydramine) when the hives break through. I will sometimes add h2 blocker such as zantac or pepcid, which also act as antihistamines.

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What can cause hives and swelling if its not an allergic reaction?

What can cause hives and swelling if its not an allergic reaction?

Hives and angioedema: Most hives and angioedema are caused by allergic reactions however they can also be caused by reactions to medications or things like heat, cold or sunlight. A variety of infections, including viral or bacterial infections, or collagen vascular disorders can cause a very similar rash.

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Are hives ever just a side effect of a drug, or are they always considered an allergic reaction?

Are hives ever just a side effect of a drug, or are they always considered an allergic reaction?

Not always: Hives may be caused by many things including viral infections. Some drugs like opiates trigger certain types of cells to release histamine and thereby causing hives. Only on rare occasions are hives caused by airborne allergens. On the other hand, drug allergy can indeed cause hives.

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When I have an allergic reaction why does alcohol make it worse and make me get hives everywhere?

When I have an allergic reaction why does alcohol make it worse and make me get hives everywhere?

Vasodilation: Alcohol has drug effect making more blood to be pumped to the skin by dilating blood vessels in the skin (vasodilation). With hives you have leaky blood vessels in the skin and the more fluid you pump into a leaky pipe the more it leaks. Over heating, exercise, taking a hot shower and eating spicey food will do the same thing.

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Can u tell me the difference between urticaria, dermatitis, and hives? Which of them is caused by allergic reaction?

Can u tell me the difference between urticaria, dermatitis, and hives? Which of them is caused by allergic reaction?

Urticaria is hives: Urticaria is derived from a Latin word meaning to burn. It is the same thing as hives. Hives lasting 6 weeks are not usually allergic in origin. Dermatitis means any kind of inflamed skin. Atopic dermatitis AKA eczema may be due to allergy. There are many other causes of dermatitis.

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Can a new manufacturer of the same meds I've been on cause hives or an allergic reaction? Only new med I took was Mucinexx DM. Maybe Mucinexx is prob?

Possibly: If you started a new medication, then it is possible for the new med to cause allergic reaction. Stop using the new medication and see if the hives go away. There are some people who have allergic reaction to generic forms of some medication as well. So of you were switched recently to a generic version, go back to the brand name. I would try the first option of stopping Mucinex (guaifenesin) and observing.

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Could a allergic reaction from cat fur be the cause of my hives?

Could a allergic reaction from cat fur be the cause of my hives?

Perhaps: Contact urticaria is known to occur but hives from dander in the air is less likely. Finding the cause for this very annoying condition is often very frustrating. Testing guided by a good history and evaluation can help.

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Why are doctors recommending Zantac (ranitidine) for an allergic reaction or hives?

Why are doctors recommending Zantac (ranitidine) for an allergic reaction or hives?

Good question: Hives (or urticaria) represent a sensitivity to something dilating the small vessels under the skin, causing a raised pink lesion; if u press on it, it will blanch, let it go it pinks up again. Many causes: foods, chemicals, perfumes, very often stress. Stress can increase acid formation in stomach, Zantac (ranitidine) reduces it. Over 50% of time, one can't find cause. I treat initially c antihistamines.

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I have red blotches on my fingers and hives on my forearm could it be a allergic reaction or something else?

I have red blotches on my fingers and hives on my forearm could it be a allergic reaction or something else?

Hives: Hives are raised, often itchy, red welts on the surface of the skin. They are usually an allergic reaction to food or medicine. Causes, incidence, and risk factors when you have an allergic reaction to a substance, your body releases histamine and other chemicals into your bloodstream. This causes itching, swelling, and other symptoms. Hives are a common reaction, especially in people with allergy.

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Allergic reaction to insect bite means hives or what else?

Allergic reaction to insect bite means hives or what else?

Allergy to insect bi: Most of the allergies to insect bites caue local reaction and itching. But some people have severe reaction to insect bites and stings especially bee stings. This is a life threatening allergic reaction and is called anaphylaxis, this can cause breathing difficulty and is an emergency. Need to be treated with Epipen (epinephrine) injection and emergency treatment.

Dr. Peter Ihle
3 Doctors shared insights

Hives (Definition)

An outbreak of red bumps or wheals that appear quickly after exposure to certain allergens (foods, medications, other substances). They can vary in size, are itchy, can burn, and can last for up to ...Read more


Dr. John Chiu
1,036 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