A drug used to inhibit or kill bacteria; an agent with antibacterial action (often overlapping with 'antibiotic').
医師は細菌感染と診断し、抗菌薬を処方した。
The doctor diagnosed a bacterial infection and prescribed an antibacterial drug.
風邪にはウイルスが多いため、抗菌薬は効かないことがある。
Because colds are often viral, antibacterial drugs may be ineffective.
抗菌薬の乱用は耐性菌の出現を招くので、用法・用量を守ることが重要だ。
Overuse of antibacterial drugs leads to resistant bacteria, so it's important to follow the prescribed usage and dosage.