Furantoin is a broad-spectrum anti-inflammatory drug, mainly used for the treatment of acute simple lower urinary tract infections caused by sensitive bacteria such as Escherichia coli, Staphylococcus enterococci, and Klebsiella enterica, and also for the prevention of urinary tract infections. Furantoin can also produce some adverse reactions: firstly, there is a risk of gastrointestinal discomfort, such as nausea, vomiting, diarrhea and other gastrointestinal reactions. In addition, it may also cause rash, drug fever, granulocytopenia, hepatitis and other metabolic reactions. Second, furantoin may cause adverse reactions such as headache, dizziness, drowsiness, and myalgia. Furantoin may also cause adverse reactions such as fever, cough, and chest pain. When applying furantoin, be sure to take it strictly according to the instructions. It is recommended to drink plenty of water and not to drink alcohol while taking it.