Possible side effects include headache, dry mouth, and drowsiness. In severe cases, it may induce glaucoma, lead to rare and severe cardiotoxicity, and cause fatal arrhythmia.

The first-generation anti-allergic drugs, antihistamines (such as chlorpheniramine, diphenhydramine), have obvious sedative effects and central nervous system adverse reactions, the most common of which are drowsiness and fatigue. If the time is prolonged, etc., you should avoid driving, operating precision instruments, etc. after taking such drugs.

Recent studies have found that second-generation antihistamines may cause rare and severe cardiotoxicity and can cause fatal arrhythmias. The above adverse reactions will be aggravated when combined with ketoconazole, itraconazole and erythromycin, so simultaneous use should be avoided.

Third-generation antihistamines, such as desloratadine, fexofenadine, levocetirizine, etc., have milder side effects and can be used in combination with erythromycin, ketoconazole, etc. Does not produce cardiotoxicity.

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Extended information

Allergies reaction Allergy refers to tissue damage or physiological dysfunction caused by the stimulation of antigenic substances. It is an immune pathological damage process. Drugs used to prevent and treat allergic diseases caused by various antigenic substances (such as bacteria, viruses, parasites, pollen, etc.) are anti-allergic drugs, also known as anti-allergic drugs.

Anti-allergic drugs are mainly used for skin and mucous membrane allergic diseases, such as urticaria, allergic rhinitis, skin itching and edema caused by insect bites; for serum sickness, drug rash, contact dermatitis It has an anti-itching effect on itching; it has poor efficacy on allergic bronchial asthma; it is ineffective on anaphylactic shock.

Anti-allergic drugs all have side effects. It is not advisable to take a certain anti-allergic drug in large doses for a long time, otherwise it will not only easily lead to drug failure, but in severe cases, various adverse reactions and even toxic side effects may occur. If you need to take other Western medicines while taking anti-allergy medicines, be sure to consult your doctor.

Reference:/baike.baidu.com/item/%E6%8A%97%E8%BF%87%E6%95%8F%E8%8D%AF/3324491?fr=aladdin# 4"target="_blank"title="Baidu Encyclopedia - Anti-allergic Drugs">Baidu Encyclopedia - Anti-Allergic Drugs