Antihistamines are used to treat drug allergies, food allergies, insect stings and some of the symptoms of anaphylaxis and angioedema.
Drug treatment and other supportive care should not be delayed in critically ill patients. Specific precipitants should be sought and if identified, further exposure avoided and desensitisation considered.
Drowsiness and sedation are particular disadvantages of the older antihistamines and the patient should be warned against driving or operating machinery.
Other central nervous system depressants, including alcohol, barbiturates, hypnotism, opioid analgesics, anxiolytis and neuroleptis, may enhance the sedative effects of antihistamines.
Since antihistamines interfere with skin tests for allergy, they should be stopped at least one week before conducting a skin test.
Allergic reactions of limited duration and with mild symptoms, such as urtiaria or allergic rhinitis, usually require no treatment.
First-line treatment of a severe allergic reacting includes administering epinephrine, keeping the airway open (with assisted respiration if necessary) and restoring blood pressure (laying the patient felt, raising the feet).
Some of the major Antihistamines and antiallergic drugs supplied by Jigs chemical are as followed:
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