A 45-year-old otherwise healthy man presents to his GP with a 2-day history of fever, productive cough and pleuritic chest pain. He is febrile at 38.3 °C, respiratory rate 22 breaths/min, oxygen saturation 95% on room air and blood pressure 120/75 mmHg. Chest auscultation reveals right lower lobe crackles. CURB-65 score is 0. What is the most appropriate empirical oral antibiotic for community-acquired pneumonia in this setting?