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Which type of medication works by blocking the action of histamine to decrease allergy symptoms?

  1. Skeletal muscle relaxants

  2. Anti-neoplastics

  3. Antihistamines

  4. Topical medicines

The correct answer is: Antihistamines

Antihistamines are medications that work by blocking the action of histamine in the body. Histamine is a chemical released by the immune system during an allergic reaction, leading to symptoms such as itching, sneezing, and runny nose. By blocking histamine's action, antihistamines help reduce or alleviate allergy symptoms. Skeletal muscle relaxants are used to reduce muscle spasms, anti-neoplastics are used to treat cancer, and topical medicines are applied to the skin or mucous membranes for local effects. These types of medications do not work by blocking the action of histamine to decrease allergy symptoms.