What are the anti-allergic medications?

Hypersensitivity reactions—also known as allergic reactions—are immune-mediated pathological responses triggered by antigenic substances, resulting in tissue damage or physiological dysfunction. Anti-hypersensitivity drugs (also termed antiallergic drugs) are medications used to prevent and treat hypersensitivity disorders induced by various antigenic agents. So, what are the available antiallergic drugs?

Based on their mechanisms of action, antiallergic drugs can be classified into the following categories:

1. Antihistamines

Antihistamines are currently the most widely used nonspecific anti-hypersensitivity agents. They are categorized into first-, second-, and third-generation antihistamines. These drugs exert their antiallergic effects by competitively binding to histamine H₁ receptors, thereby antagonizing histamine’s pathophysiological actions. Clinically, they are employed for allergic skin disorders, respiratory allergic diseases, allergic asthma, and allergic conjunctivitis.

2. Immunosuppressants

Immunosuppressants are agents that inhibit immune responses by suppressing the proliferation and function of immune-related cells and reducing antibody-mediated immunity. Commonly used immunosuppressants include glucocorticoids, microbial metabolites, antimetabolites, polyclonal and monoclonal anti-lymphocyte antibodies, and alkylating agents.

3. Allergic Mediator Release Inhibitors

Allergic mediator release inhibitors stabilize mast cell membranes, thereby preventing the release of histamine and other allergic mediators and producing antiallergic effects. Additionally, certain agents—including glucocorticoids and immunosuppressants—can suppress antigen–antibody reactions.

The above outlines the major classes of antiallergic drugs: antihistamines, immunosuppressants, and allergic mediator release inhibitors. We hope this information is helpful to you.