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Allergies: Prevention & Treatment

Be prepared for seasonal and chronic allergies.

For most people, allergies mean itchy eyes and a drippy nose. But for a few people, allergies to things like bee stings or nuts cause a whole-body reaction that can be life-threatening. Whether your allergies are dangerous or just annoying, the information below can help you cope.

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Table of Contents:
  1. Allergic Rhinitis
  2. Avoiding Allergy Triggers
  3. Food Allergies
  4. Drug Allergies
  5. Insect Sting Allergies


More health topics

Allergic Rhinitis / Seasonal Allergies
What is allergic rhinitis?

Allergies happen when you are exposed to certain particles in the air (allergens). Your body's defense system (immune system) overreacts to certain substances. The immune system may treat a harmless substance as if it were a harmful germ or virus. Many things can cause this problem. You can be allergic to things such as pollens, dust, or animal dander.

Your allergies can be mild or severe. Mild allergies can be managed with home treatment. But medicine may be needed to prevent problems.

When allergies aren't treated, they can affect your health. You may have problems such as sinusitis, plugged ears, and ear infections. Allergies can also affect your quality of life. You may avoid seeing people, have problems sleeping, and feel tired or grumpy.

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Risk Factors

You may be more likely to have allergic rhinitis and other allergies if:

  • You have a family history of allergies, especially allergic rhinitis. A child is more likely to have an allergy if both parents have an allergy or have the same type of allergy.
  • You are exposed to dust mites, animal dander, or other indoor allergens.
  • You are exposed to pollens or molds.

Symptoms

Allergy symptoms may start within minutes or hours after you breathe in an allergen. And the symptoms can last for days.

When symptoms start right away, you may sneeze over and over again. This often happens after you wake up in the morning. You may have a tickle in your throat or coughing caused by postnasal drip. Your nose may be runny. And your eyes may be watery and itchy. Your ears, nose, and throat may also be itchy.

Other symptoms may take longer to appear. For example, you may have a stuffy nose. You may feel pressure in one or both ears, or have pain in your face. Your eyes may be sensitive to light. You may also have a long-lasting cough. Some people notice dark circles under their eyes.

Your symptoms may be better or worse at different times of the year.

When to Call a Doctor

Call your doctor if:

  • You have pain in the sinus area and other symptoms of sinus infection. (Symptoms may include fever or a creamy, yellow or green discharge from the nose.)
  • Your allergy symptoms get worse and you don't know why.
  • You are taking a prescription or over-the-counter allergy medicine that does not help your symptoms.
  • Your allergy medicine is causing side effects that bother you, such as decreased coordination or increased drowsiness.
  • You have a fever or ear pain.
  • You have a cough or cold that lasts longer than 1 to 2 weeks.
  • You have severe itching of the eyes or nose.
  • Your allergy disturbs your life.

Allergy Specialists

You may need to see an allergy specialist (allergist). This depends on your symptoms or which other treatments you may need. For example, you may need to see a specialist if your medicines are not working or cause severe side effects. Another reason is if you are thinking about getting immunotherapy (such as allergy shots).

Your doctor may refer you to an ear, nose, and throat (ENT) specialist (also called an otolaryngologist or otorhinolaryngologist). An ENT specialist may be helpful if your doctor thinks you may have nasal polyps or other things blocking your nose.

Allergy Testing

Your doctor can most often diagnose allergic rhinitis by doing a physical exam and asking you questions about your symptoms, activities, and home.

You may need allergy tests if:

  • You and your doctor need to find out exactly what things you are allergic to. And then you can take steps to avoid them.
  • Treatment is not helping your symptoms.
  • You have severe symptoms.
  • You are thinking about trying immunotherapy (such as allergy shots).
  • A skin test can show how your skin reacts to an allergen. Or a blood test can measure the level of antibodies that your body makes in response to certain allergens.

These tests can help your doctor know what is causing your symptoms and find the best treatment.

Allergy testing involves having a skin or blood test to find out what substance, or allergen, may trigger an allergic response in a person. Skin tests are usually done because they are rapid, reliable, and generally less expensive than blood tests, but either type of test may be used.

Skin Tests
  

Skin prick test

 This test is done by placing a drop of a solution containing a possible allergen on the skin, and a series of scratches or needle pricks allows the solution to enter the skin. If the skin develops a red, raised itchy area (called a wheal), it usually means that the person is allergic to that allergen. This is called a positive reaction.
Intradermal test
 During this test, a small amount of the allergen solution is injected into the skin. An intradermal allergy test may be done when a substance does not cause a reaction in the skin prick test but is still suspected as an allergen for that person. The intradermal test is more sensitive than the skin prick test but is more often positive in people who do not have symptoms to that allergen (false-positive test results).
Skin patch test
 For a skin patch test, the allergen solution is placed on a pad that is taped to the skin for 24 to 72 hours. This test is used to detect a skin allergy called contact dermatitis.
Blood Tests
  
Enzyme-linked immunosorbent assay test (ELISA, EIA) The most common type of blood test used is the enzyme-linked immunosorbent assay (ELISA, EIA). It measures the blood level of a type of antibody (called immunoglobulin E, or IgE) that the body may make in response to certain allergens. IgE levels are often higher in people who have allergies or asthma.

Radioallergosorbent testing (RAST)

Immunoassay capture test (ImmunoCAP)

 Other lab testing methods, such as radioallergosorbent testing (RAST) or an immunoassay capture test (ImmunoCAP, UniCAP, or Pharmacia CAP), may be used to provide more information.

Your allergy test results may show that allergy treatment is a choice for you.


Treatment

There are three main treatments for allergic rhinitis:

  • Avoid the things you are allergic to (allergens). For example, you may need to clean your house often to get rid of animal dander. Or you may need to stay indoors when pollen counts are high.
  • Manage your symptoms with medicine. Over-the-counter corticosteroid nasal spray, antihistamine or decongestant pills, or prescription nasal spray antihistamines may help relieve some of your symptoms.
  • Get immunotherapy (such as allergy shots). For this treatment, you get shots or take pills that have a small amount of certain allergens in them. Your body "gets used to" the allergen, so you react less to it over time.
Allergy Medications

Medicines are a key part of treatment for allergic rhinitis. 

You can get corticosteroid nasal sprays over-the-counter or by prescription. These help reduce inflammation in the nose. They work well for most people. They start working quickly, but it may be several weeks before you get the full effect.

There are other types of allergy medicines you can buy with or without a prescription:

Over-the-Counter Medications
  

Antihistamines

 These help your sneezing, runny nose, itching, and watery eyes.
Decongestants These help relieve a stuffy nose.
Eyedrops These help red, itchy, and watery eyes.
Prescription Medications
  
Antihistamine nasal spray May help moderate to severe symptoms.
Ipratropium bromide It can relieve a runny nose.
 Leukotriene modifiers These can relieve a stuffy nose, itching and sneezing, and a runny nose.
 
Self-Care

Taking care of yourself is an important part of staying healthy when you have allergies.

Your doctor will help you find out what may be causing your allergies. As soon as you know what triggers your symptoms, try to avoid those things. This can help prevent allergy symptoms, asthma, and other health problems.

There are steps you can take to avoid your allergy triggers. For example, if you are allergic to house dust, it helps to wash your bedding in hot water each week. If your allergies are caused by pollen, try to stay inside when pollen counts are high. It also helps to stay away from smoke. Being around smoke can make your allergies worse.

Ask your doctor about allergy medicine, including over-the-counter medicine. There may also be other treatments that can help reduce or prevent allergy symptoms.

Minimizing Allergies: Avoiding Triggers
How do I control indoor and outdoor allergies?

When you have allergies, you may feel better or worse at different times of the year. Learning what triggers your allergy symptoms will help you manage and treat your allergies. Managing your allergies is an important part of your health and can help you avoid other problems.

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Work with your doctor to find out what you're allergic to. When you know what triggers your allergies, you can take steps to control those allergens in your home. It's especially important to prevent allergens in your bedroom.

General Cleaning

Clean often: Regular housecleaning can help prevent allergens from building up.

Control animal dander and other pet allergens: For example, keep pets out of your bedroom. Keep your pet in areas that have hard floors, which are easier to clean than carpeted floors.

Remove items where allergens build up: Examples include stuffed animals and rugs.

Avoid indoor air pollution:

  • Polluted air doesn't cause allergies, but it can irritate the nose and lungs. This may make it more likely that you will have symptoms.
  • Avoid tobacco smoke, smoke from wood-burning stoves, and fumes from kerosene heaters.
  • If you have a wood-burning stove, try to use one that is airtight and doesn't leak smoke into your home.

Controlling Dust & Dust Mites

Dust and dust mites are a common indoor allergen. Allergens are things that can trigger an allergic reaction. Allergens can cause a rash, a stuffy nose, or other symptoms such as wheezing or coughing.

Dust mites are visible only through a microscope. People are allergic to dust mite droppings, not the dust mites themselves. Allergy to dust mites is a year-round problem. 

 Helpful Tips
 Reduce dust and dust mites in the air:

  • Don't use window or attic fans, which bring air containing pollen, mold spores, and other allergens into your home.
  • Use air conditioning so you don't have to open windows. This will help reduce the amount of pollen and mold spores that enter your home.
  • Use an air cleaner with a special high-efficiency particulate air (HEPA) filter. This can help remove some allergens (such as pollen or pet dander) and tobacco smoke from the air in your home.
 Reduce dust and dust mites in furniture, carpets, drapes, and bedding:
  • Avoid carpet, upholstered furniture, and heavy drapes that collect dust. Avoid furniture covered with fabrics.
  • Use dust-proof pillow and mattress covers made from a tight-weave fabric that keeps out dust and mites.
  • Use furniture made of wood, plastic, leather, or vinyl (including vinyl mattress covers) that you can wipe clean.
  • Remove rugs and wall-to-wall carpeting. Talk with your family about this and about how this will affect family life. If you can't or don't want to remove carpeting throughout the home, think about removing it only in the bedroom.
  • Use smaller rugs (throw rugs, area rugs) that you can wash.
  • Replace drapes and blinds with roll-down shades or washable curtains.
  • Remove "dust collectors" from bedrooms, such as stuffed toys, wall hangings, books, knickknacks, and artificial flowers.
  • Avoid wool blankets and down quilts.
 Mop, dust, and vacuum to reduce dust and dust mites:

  • Damp-mop hard floors (tile or hardwood, for example) once a day.
  • Dust and vacuum once or twice a week to remove the buildup of allergens. Use a dry cloth to wipe hard surfaces such as countertops, tables, and other furniture.
  • Vacuum the carpets and cloth-covered furniture to get rid of as much dust as you can.
  • Use a vacuum cleaner with a HEPA filter or a special double-thickness bag, which collects dust-mite particles and pollen. Standard paper bag filters may allow the stirred-up allergens to escape back into the room.
  • Dusting and vacuuming stir up dust, making the air worse until the dust settles. Wear a mask if you do the cleaning yourself. If possible, try to have someone without allergies do the cleaning.
  • Consider wet-vacuum cleaning when possible. This can help remove allergens from carpeting because it actually washes the carpet. Also, consider steam cleaning carpets when possible. In addition to cleaning the carpet, the heat of the steam kills dust mites.
 Take other steps to reduce dust mites:

  • Keep the house aired out and dry. Dust mites do well where humidity is greater than 50% but don't do well in dry conditions. This may be difficult in some seasons and some climates. Plants and fish tanks add to humidity, so keep these out of the bedroom.
  • Dry vacuuming doesn't pick up dust mites. Consider steam cleaning carpets when possible. In addition to cleaning the carpet, the heat of the steam kills dust mites.
  • You can buy chemicals (ascaricides) that kill dust mites and that you can use on carpeting and furniture. But many experts don't consider them effective enough to be worth the trouble and expense of using them.
  • Wash bedding, including pillowcases and mattress covers, in hot water every week. You can also dry bedding at high temperatures.

Controlling Mold

For example, clean bathtubs and showers with soap and water, mold-killing products, or liquid bleach mixed with water. Try to keep your house aired out and dry.

Indoor mold (fungus) is very common in humid areas and in homes that have damp areas such as basements. Mold may trigger symptoms, such as wheezing or coughing, or another allergic reaction, such as the rash of atopic dermatitis or the stuffy nose of allergic rhinitis. Substances that trigger these reactions are called allergens.

Mold can get into a building through open doorways, windows, vents, and heating and air conditioning systems. Mold in the air outside can also attach itself to clothing, shoes, bags, and pets and can be carried indoors. Mold will grow in places that have a lot of moisture, such as around leaky roofs, windows, or pipes, or flooded areas. Mold grows well on paper products, cardboard, ceiling tiles, and wood products. Mold can also grow in dust, paints, wallpaper, insulation, drywall, carpet, and fabrics. 

 Helpful Tips
 Control mold in your home:

  • Clean bathroom surfaces with soap and water, mold-killing products, or liquid bleach mixed with water. If you have mold in your home, remove it with one of these methods. Use bleach with caution, because it may irritate your nose and lungs.
  • Add a mold inhibitor product to paint that you use in the home.
  • Store fireplace wood outside the home. Drying green firewood can contain mold spores.
  • Check houseplants for mold. Repot or move them outside if the soil contains mold.
 Control moisture:
  • Remove carpeting from rooms that may have a lot of moisture, such as the bathroom and basement.
  • Inspect closets for items, such as shoes, that may retain moisture.
  • Keep the house aired out and dry. This may be difficult in some seasons and some climates:

– Use an exhaust fan in bathrooms and the kitchen to vent excess moisture.

– Make sure your clothes dryer vents moist air to the outside.

  • Use a dehumidifier or air conditioner during humid weather. Try to keep the humidity in the home below 50%. Molds thrive in higher humidity. You can use a moisture or humidity meter to find out how humid it is in your home. Many hardware stores sell this device.
  • Seal off or avoid damp areas, such as crawl spaces, attics, or basements. Use a dehumidifier to control mold growth in these areas. Try to avoid materials that have been stored in these areas.
  • Repair any water-damaged areas from leaking roofs or basements. Also, check the areas under sinks and around other plumbing for leaks. These areas can be prime mold-growing areas.
Pollens

The following tips can help you avoid pollens, even if you don't know what type of pollen you are allergic to. If you do know, you can fine-tune these tips for that type of pollen. 

Helpful Tips
  • Stay inside when pollen levels are high.
  • Watch local weather reports for pollen counts in your area. In general, the pollen counts are lowest just after sunrise. They then begin to increase and are usually highest at midday and throughout the afternoon. They begin to decrease around sunset.
  • Keep windows and doors closed, both during the day and at night.
  • Use air-conditioning, and change or clean all filters every month. Do not use a fan with an open window, as this can bring more pollen into your home.
  • Keep your grass mowed.
  • If possible, have a family member or friend do it for you. If this is not possible, use antihistamines before you mow, and wear a pollen or dust mask while you mow.
  • Avoid bringing pollen back into your home when you go outdoors.
  • Take a shower and change clothing after you work or play outside. And dry your clothes in a vented dryer. Do not dry them outside on a clothesline.

Mold

Mold may cause allergies that get worse in damp weather. Mold also produces spores that move around in outdoor air during warmer months. By taking the following precautions, you may have fewer or less severe symptoms. 

Helpful Tips
  • Avoid going outside on rainy or windy days when mold spores may be in the air.
  • Avoid activities that expose you to molds.
  • Examples include gardening (especially working with compost), mowing the lawn, and raking leaves.
  • Keep rain gutters and drains clear of leaves and other debris.
  • Also, make sure that the water from downspouts flows away from the house.
  • Remove excess leaves, grass clippings, and compost from the areas close to your home.
  • Use products to reduce the mold that can grow in your car air conditioner. These products are available in auto supply stores.

Food Allergies
What is a food allergy?

When you have a food allergy, your body thinks certain foods are trying to harm you. Your body fights back by setting off an allergic reaction. In most cases, the symptoms are mild—a rash or an upset stomach. A mild reaction is no fun, but it isn't dangerous. A serious reaction can be deadly. But quick treatment can stop a dangerous reaction.

Food allergies are more common in children than in adults. Children sometimes outgrow their food allergies, especially allergies to milk, eggs, or soy. But if you develop a food allergy as an adult, you will most likely have it for life.

Many people think they have a food allergy, but in fact they have food intolerance. An intolerance can cause some of the same symptoms as a mild food allergy, like an upset stomach. It can make you feel bad, but it isn't dangerous.

Food intolerances are much more common than food allergies. True food allergies are a reaction to food or food additives by your body's immune system. But a food intolerance doesn't cause an allergic reaction.

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Causes

Food allergies occur when your body's immune system overreacts to substances in food you have eaten. This triggers an allergic reaction. Food allergies are more common in young children than in adults.

  • Milk, eggs, peanuts, tree nuts, fish, shellfish, wheat, and soy cause most problems in children. Some babies are so sensitive to these foods that if the food is eaten by the mother, drinking her breast milk can cause a reaction. Most children outgrow allergies to eggs, milk, wheat, and soy.
  • Peanuts, tree nuts, fish, and shellfish cause most of the allergic reactions in teens and adults. Adults typically remain allergic to the food for life.

If you are highly sensitive to a certain food, you may have an allergic reaction just by being near where the food was prepared or served.


Symptoms

Food allergies can cause many different symptoms. They can range from mild to serious. A mild reaction may include tingly lips, a stuffy nose, dizziness, and a few raised, red, itchy patches of skin (called hives).

The most severe reaction is called anaphylaxis. It affects your whole body. Anaphylaxis can start within a few minutes to a few hours after you eat the food. The symptoms can go away and come back hours later. A severe reaction may cause hives all over, swelling in the throat, trouble breathing, nausea or vomiting, or fainting.

Your doctor will ask questions about your past health and family food allergies. And he or she will do a physical exam. Your doctor will also ask what symptoms you have when you eat certain foods.

Because food allergies can be confused with other problems, your doctor may do some tests. You may have either skin testing or a blood test. These tests help to see what you are allergic to. An oral food challenge is another way to diagnose a food allergy. You will eat a variety of foods that may or may not cause an allergic reaction. Your doctor watches to see if and when a reaction occurs.

The best treatment for allergic reactions to food is to avoid the food that causes the allergy. When that isn't possible, you can use medicines such as antihistamines for mild reactions and epinephrine for serious reactions. Epinephrine is a shot that you can give yourself when needed.

Drug Allergies
What is a drug allergy?

A drug allergy occurs when your immune system overreacts to something in a medicine. Your body's immune system fights back by setting off an allergic reaction. Most drug allergies are mild, and the symptoms go away within a few days after you stop using the medicine. But some drug allergies can be very serious.

Some drug allergies go away with time. But after you have an allergic reaction to a drug, you will probably always be allergic to that drug. You can also be allergic to other drugs that are like it.

A drug allergy is one type of unwanted, or adverse, drug reaction. There are other kinds of adverse drug reactions. Symptoms and treatments of different kinds of adverse reactions vary. So your doctor will want to find out if you have a true drug allergy or if you have side effects that are not as serious.

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Causes

Any medicine can cause an allergic reaction. A few of the most common ones are:

  • Penicillins (such as ampicillin or amoxicillin).
  • Sulfa medicines.
  • Anesthesia.
  • Aspirin and other nonsteroidal anti-inflammatory drugs.

If you are allergic to one medicine, you may be allergic to others like it. For example, if you are allergic to penicillin, there is a chance that you may also be allergic to similar medicines, such as amoxicillin.


Symptoms

The symptoms of a drug allergy can range from mild to very serious. Most of the time they appear within 1 to 72 hours. They include:

  • Hives, a rash, and itchy skin.
  • Coughing, wheezing, a runny nose, and trouble breathing.
  • A fever.
  • Serious skin conditions that make your skin blister and peel. These include toxic epidermal necrolysis and Stevens-Johnson syndrome.
  • Anaphylaxis, which is the most dangerous reaction. It can be deadly, and you will need emergency treatment. Symptoms include hives all over your body, trouble breathing, nausea or vomiting, swelling of the throat or mouth, and/or feeling very lightheaded. These usually appear within 1 hour after you take the medicine. Without emergency care, you could die.

Your doctor will diagnose a drug allergy by asking you questions about the medicines you take and about any medicines you have taken in the recent past. Your doctor will also ask about your past health and your symptoms. Your doctor may do a physical exam.

If this doesn't tell your doctor whether you have a drug allergy, you may need skin tests. Or your doctor may have you take small doses of a medicine to see if you have a reaction.

Treatment

If you have severe drug allergies, your doctor may give you an epinephrine auto-injector. Your doctor will teach you how to use it. If you have a serious allergic reaction, you may need to give yourself the shot and get emergency medical treatment.

Inject epinephrine into the thigh muscle if you have signs of a severe allergic reaction, such as trouble breathing, having hives all over your body, or feeling faint. Call 911 right away.

If you have a mild allergic reaction, over-the-counter (OTC) antihistamines may help your symptoms. Mild symptoms include sneezing or an itchy or runny nose; an itchy mouth; a few hives or mild itching; and mild nausea or stomach discomfort. You may need prescription medicine if OTC antihistamines don't help or if you have problems with side effects, such as drowsiness. Not all OTC antihistamines cause drowsiness.

The best thing you can do for a drug allergy is to stop taking the medicine that causes it. Talk to your doctor to see if you can take another type of medicine.

If you can't change your medicine, your doctor may try a method called desensitization. This means that you will start to take small amounts of the medicine that caused your reaction. Under your doctor's supervision, you will then slowly increase how much you take. This lets your immune system "get used to" the medicine. After this, you may no longer have an allergic reaction.

Be sure to wear a medical alert bracelet or other jewelry that lists your drug allergies. If you are in an emergency, this can save your life.


Self-Care


To take care of yourself at home:

  • Know which medicines you're allergic to, and avoid taking these medicines.
  • Keep a list of all medicines you are taking.
  • Talk with your doctor or pharmacist about any new medicines you are prescribed. Make sure they are not similar to those that can cause a reaction.
  • Don't use someone else's medicines or share yours.

If you do have a mild reaction, take steps to relieve symptoms such as itching. Take cool showers, or apply cool compresses. Wear light clothing that doesn't bother your skin. Stay away from strong soaps and detergents, which can make itching worse.

Insect Sting Allergies
What are insect sting allergies?

An allergic reaction to a sting occurs when your body's immune system overreacts to substances called allergens in the venom of stinging insects such as bees, wasps, hornets, or fire ants.

There are different types of allergic reactions to stings including minor localized reactions, large local reactions, and systemic reactions (which includes life-threatening reactions such as anaphylaxis).

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Minor Local Reactions

Minor allergic reactions occur around the site of the sting. This is called a localized reaction, and it can cause pain, itching, redness, swelling, and hives near the site of the sting.


Large Local Reactions

Large local reactions may cause the same symptoms as mild reactions, plus redness and swelling that affects large parts of your body, such as an entire arm or leg.


Systemic Reactions

Systemic reactions are those that spread throughout your body. One type may only involve your skin, causing hives or deeper skin swelling (a cutaneous reaction), but it does not affect the tongue or throat or cause breathing problems. A more serious type of systemic reaction can cause symptoms such as swelling of the tongue, throat, or other body parts. A life-threatening systemic allergic reaction called anaphylaxis can cause severe symptoms such as confusion, trouble breathing, shock, and sometimes death.

Rush Immunotherapy

If you have had severe reactions to insect stings in the past, you may want to get a series of allergy shots on a faster schedule, called "rush immunotherapy." For this you get allergy shots every few hours on one day or every few days. This helps to rapidly increase your tolerance to an allergen. After the first shot, you must wait to see if you have a reaction to the shot. If you don't have a reaction, you get more shots throughout the day. You (or your child) may feel anxious about receiving the next shot. So it may help to bring a book or something to distract you while you wait. Rush immunotherapy is usually done by a specialist. Having a severe reaction to this treatment is more likely than with standard allergy shots.

This treatment usually works in 1 to 8 days instead of the standard treatment, which takes several months. You may have this "rush" treatment if you have severe or life-threatening allergic reactions to insect stings, are a long distance from any type of health care center, or are about to travel.


Allergy Shots

Allergy shots work by putting small amounts of insect venom into your body, making you less sensitive over time to the venom.

Getting a series of allergy shots can prevent a systemic allergic reaction or make it less severe. Allergy shots aren't needed if you have a mild reaction, a large local reaction, or even a systemic reaction that only affects your skin. Only about 4 to 10 people out of 100 who have these kinds of reactions to insect stings go on to have a more serious, anaphylactic reaction. This means that 90 to 96 out of 100 people who have localized reactions don't ever have an anaphylactic reaction to an insect sting.footnote1

Allergy shots can greatly reduce your risk of having another life-threatening reaction if you've had one before. Imagine a group of 100 people who have had a life-threatening reaction. Without allergy shots, up to 60 of those 100 people will have another life-threatening reaction in the future. But if those 100 people get allergy shots, only 5 of them will have another life-threatening reaction. This treatment is most effective after an entire course of allergy shots is complete.

After allergy tests have identified the insect(s) you are allergic to, you can begin to get the shots. At first, you will get weekly shots of small doses of venom and allergens from the insect(s) that cause your allergies. After about 4 to 6 months of weekly shots, you will get a regular dose, called a maintenance dose, every 4 weeks for 3 to 5 years, depending on the type of stings that cause your allergies. For example, fire ant allergies require longer treatment than other stinging insect allergies.


Allergy Shot Risks & Doctor Recommendations

Allergy shots are safe for most people. The most common side effects are redness and warmth at the injection site. Some people may have large local reactions that include itching, hives, or swelling of the skin near the injection site.

But allergy shots can trigger a more serious reaction, which may include trouble breathing or swelling in the deep layers of the skin. In rare cases, a person may have a life-threatening allergic reaction (anaphylaxis) to the shots. Because of this, the shots are given in a clinic or other health care setting where emergency care can be provided if needed.

Talk with your doctor if you have an autoimmune disease (such as lupus) or are taking medicine for heart problems (such as beta-blockers or ACE inhibitors). Allergy shots may not be safe for you.

Doctor Recommends Allergy Shots

Your doctor may advise you to have allergy shots for insect stings if:

  • Allergy tests showed that you are sensitive to allergens from the venom of one or more insects.
  • You had a life-threatening allergic reaction to an insect sting.
  • You have anaphylactic reactions to insect stings but cannot carry epinephrine with you at all times.
  • You work outside and have worse reactions each time you are stung.
  • You have only been stung once but had a moderate to severe reaction.
Doctor Does Not Recommend Allergy Shots

Your doctor may NOT recommend allergy shots for insect stings if:

  • Allergy tests showed that you are not sensitive to allergens from the venom of insects.
  • You have an autoimmune disease (such as lupus) or are taking heart medicine (such as beta-blockers or ACE inhibitors).
  • Your allergic reaction to insect stings doesn't cause an anaphylactic reaction.
  • You are younger than 16 and had a mild skin reaction all over your body (cutaneous reaction) without any other symptoms.
  • You tried allergy shots before, but the shots triggered a moderate to severe allergic reaction.

Current as of: February 27, 2023

Author: Healthwise Staff

Medical Review: E. Gregory Thompson MD - Internal Medicine; Adam Husney MD - Family Medicine; Martin J. Gabica MD - Family Medicine; Kathleen Romito MD - Family Medicine; Rohit K Katial MD - Allergy and Immunology