What do antihistamines primarily treat?

Antihistamines primarily treat the symptoms of allergies. They work by blocking the action of histamine, a substance in the body that is released during an allergic reaction. When allergens such as pollen, dust, or pet dander enter the body, histamines are released, causing symptoms like sneezing, itching, runny nose, and hives. By inhibiting histamine's effects, antihistamines help alleviate these symptoms, making them a fundamental treatment option for allergic reactions.

Other options, while they represent important medical conditions, do not align with the primary function of antihistamines. Cough reflex suppression is typically managed by different types of medications known as cough suppressants, not antihistamines. Muscle movement disorders usually require medications such as antipsychotics or muscle relaxants, while the control of seizures is primarily managed with anticonvulsant medications. Thus, antihistamines specifically and effectively address allergy symptoms, distinguishing them from the other therapeutic uses in the choices provided.