The document discusses three types of medications used to treat respiratory infections and allergies: antibiotics, antihistamines, and decongestants. Antibiotics kill bacteria causing respiratory infections, with examples like amoxicillin and ciprofloxacin. Antihistamines block the effects of histamine released during allergy attacks, with common brands being Claritin, Benadryl, and Allegra. Decongestants reduce stuffiness and congestion in the respiratory system, such as Afrin, Sudafed, and Dristan.