Soru

An $18$-month-old toddler is evaluated at the primary care clinic for a cough and fever. She initially developed clear rhinorrhea and a mild cough four days ago. Yesterday, her cough worsened, and she developed a fever. Her parents report that she is drinking fluids adequately but has a decreased appetite. Her temperature is $39.2^\circ\text{C}$ ($102.6^\circ\text{F}$), pulse is $142/\text{min}$, and respiratory rate is $48/\text{min}$. Oxygen saturation is $96\%$ on room air. Physical examination reveals a well-developed child in mild respiratory distress. Auscultation of the lungs demonstrates focal crackles and decreased breath sounds over the left lower lung field. No wheezing or stridor is appreciated. Capillary refill is less than $2$ seconds. Based on these clinical findings, what is the most appropriate initial pharmacological management?