doctor head
  pharmacy and drugs  
search Search
       About us       News      A-Z Drugs      Stores      Top Drugs      Contact  
  doctor doctor hand
  doctor legs  



Subscribe to our newsletter:

  Allergic reaction

An allergic reaction is the body's response to a potential "invader", a substance which foreign also called an antigen that is capable of triggering the immune system. The immune system is the body’s capacity to protect or repel against harmful agents such as bacteria and toxins. However, an overreaction to a harmless substance such as an allergen, a mild antigen is called hypersensitivity, or an allergic reaction.

Allergic reaction Allergies
Allergic reaction

Any substance that is foreign can be an allergen. Some examples of allergens are dust, pollen, plants, some medications (e.g. antibiotics), certain foods (e.g. nuts, seafood, legumes, insect venoms, insect stings (e.g. wasps, bees), viruses and bacteria.

Allegric reactions may vary ranging from a localized area or as one spot, such as a small skin rash or itchy eyes, or a generalized in form which is distributed all over, as in a whole body rash. This reaction may be accompanied by one or several of the following symptoms: skin redness, itchiness, swelling, blister formation with weeping and crusting, rash, eruptions and most commonly the appearance of hives or wheals (itchy welts); respiratory symptoms may include wheezing, chest tightness or shortness of breath with coughing episodes; headache and angioedema of the face manifested as facial swelling including puffiness of the eyelids, lips, tongue and throat; nasal discharge characterized as thin and clear with accompanying stuffy nose and sneezing; eyes may be very red with itchiness, swelling and watery and lastly, abdominal pain with or without nausea, vomiting and diarrhea. Almost anything can trigger a hypersensitivity or allergic reaction.

The clinical picture and the symptoms of an allergic reaction depend on the part of the body which is involved and how severe the reaction is. Some reactions affect many areas, while others just affect a particular single area. Reactions to the same allergen vary from one individual to another.

Medical history is very important especially questions about symptoms and the timing or onset of appearance of the typical signs of hypersensitivity reactions. Blood tests and x-rays are not usually needed by the doctor except under unusual circumstances like when a systemic disease is suspected.

The best treatment for allergic reaction is avoidance of triggers. If you had determined for yourself that you are allergic to a certain food for example, peanuts then do not eat them. Also, be careful in consuming any food products prepared with or around peanuts.

Treatment of small allergic reactions with mild symptoms is by the use of prescribed or nonprescription allergy medications such as an oral antihistamine (e.g. diphenhydramine (Benadryl). However, you have to be careful with these antihistamines because it crosses the blood-brain barrier and may make you too drowsy to drive or operate machinery safely. In children, learning at school is affected as well because of affecting concentration. These sedating antihistamines should be taken for only a few days. An alternative is the use of newer non-sedating antihistamines such as loratadine (Claritin).

For rashes, an anti-inflammatory steroid cream such as hydrocortisone may be applied topically.

For those patients with small, localized skin reactions, try applying cold, wet cloths or ice and even a bag of frozen vegetables wrapped in a towel to the affected area.

For long-term allergies such as hay fever or reactions to dust or animal dander, the following medications may provide relief : Long-acting non-sedating antihistamines, such as cetirizine (Zyrtec), fexofenadine (Allegra), and loratadine (Claritin) which can be taken for several months or even indefinitely; topical or nasal corticosteroid sprays are widely prescribed if the nasal symptoms are not relieved by antihistamines. Examples are fluticasone (Flonase or Flixotide), mometasone (Nasonex), and triamcinolone (Nasacort). Nasal steroid sprays work very well and are considered safe without the side effects of taking steroids by mouth or injection.

For severe reactions which can cause serious life threatening anaphylactic shock, the following medications are usually given immediately to rapidly reverse the ongoing symptoms: epinephrine, antihistamines and corticosteroids.

1 - 10 of 12 <<previous | next>>       View All



Azmacort, or Triamcinolone, is one of a group of Inhalation Corticosteroids used to help prevent the symptoms of asthma. When used regularly, inhalation corticosteroids decrease the number and severity of asthma attacks, but will not relieve an asthma att more...

Nasonex spray


Nasonex, also called Mometasone, belongs to the family of medicines known as corticosteroids, which belong to the family of medicines called steroids. Nasonex is sprayed into the nose to help relieve stuffy nose, irritation, and the discomfort of hay feve more...

Singulair tablets


Also called Montelukast, Singulair is used to decrease the symptoms of asthma and the number of acute asthma attacks. It is an antiasthmatic, leukotriene receptor antagonist. Because of how it works, though, Singulair should not be used to relieve an asth more...



Corticosteroids like Methylprednisolone are used to provide relief for inflamed areas of the body. They lessen swelling, redness, itching, and allergic reactions. They are also often used for severe allergies or skin problems, asthma, or arthritis. Be more...

Prednisone tablets


Prednisone and other Corticosteroids are used to provide relief for inflamed areas of the body. They lessen swelling, redness, itching, and allergic reactions. They are often used as part of the treatment for a number of different diseases, such as severe more...



Triamcinolone is in a class of drugs called steroids. Triamcinolone reduces swelling and decreases the body's immune response. Triamcinolone is used to treat endocrine disorders when the body does not produce enough of its own steroids. I more...



Montelukast belong to a class of drugs known as leukotriene inhibitors. Leukotrienes are chemical substances in the body that are associated with the inflammation, constriction of airway muscles and fluid accumulation in the lungs. These things happen in more...



Patanol is the brand name for the prescription medication olopatadine ophthalmic, which is administered as eye drops. Patanol is an antihistamine, which inhibits the production and release of histamines. Histamines cause allergic reactions in the body a more...

Mometasone inhalation

Mometasone inhalation

Mometasone belong to a class of drug known as corticosteroid. It prevents the release of substances in the body that cause inflammation. Mometasone inhalation is used to prevent attacks of bronchial asthma. Important information on mometasone inhalati more...

Nasacort AQ

Nasacort AQ

Nasacort AQ is a steroid. It prevents the release of substances in the body that cause inflammation. Nasacort is used to treat the nasal symptoms of allergies and other seasonal reactions. Nasacort may also be used for purposes other than those listed in this medication guide. more...

1 - 10 of 12 <<previous | next>>        View All

© 2006-2012 All rights reserved.