For Cephalexin, patients should seek medical attention if which symptom develops?

Cephalexin is a cephalosporin antibiotic commonly used to treat bacterial infections. While patients may experience various side effects when taking this medication, the development of a rash is particularly noteworthy. A rash can indicate an allergic reaction, which may escalate into more serious conditions, such as Stevens-Johnson syndrome or anaphylaxis.

Patients should be educated on this risk and advised to seek medical attention if a rash develops during treatment with Cephalexin, as it may require immediate intervention. On the other hand, while fatigue, headache, and nausea can occur as side effects from Cephalexin or other medications, these symptoms are generally less critical and do not typically denote an urgent medical condition. It's important for patients to be vigilant about any rash, as it is a potential sign of a more severe hypersensitivity reaction.