Antibiotics target bacteria to treat infections without harming the host. Common brand name antibiotics include Zithromax, Novamex, and Levaquin, which treat infections like strep, syphilis, and UTIs but can cause side effects like nausea, diarrhea, and organ damage. Expectorants help bring up mucus from the respiratory tract, while antitussives suppress coughs. Popular expectorants include Mucinex and guaifenesin, and antitussives include Vicks Formula 44, hydrocodone, and dextromethorphan. Users should only take antibiotics as prescribed by a doctor.