Cephalexin is a semi-synthetic cephalosporin antibiotic used to treat susceptible bacterial infections. Its therapeutic role is to inhibit bacterial cell wall synthesis leading to bacterial lysis and death. The drug acts by binding to specific penicillin-binding proteins that are essential for peptidoglycan cross-linking. This interaction prevents the formation of an intact cell wall making bacteria vulnerable to osmotic pressure. Cephalexin is orally absorbed and reaches peak serum concentrations within one to two hours after ingestion. It distributes widely in body fluids and is minimally metabolized allowing unchanged drug to exert its antimicrobial effect. The pharmacodynamic effect results from progressive inhibition of cell wall growth causing bacterial division to cease. Elimination occurs primarily through renal excretion without significant hepatic metabolism.

Cephalexin is a first-generation cephalosporin antibiotic used in the treatment of bacterial infections. Its therapeutic role involves inhibiting bacterial cell wall synthesis by binding to penicillin-binding proteins. This interaction disrupts the formation of the peptidoglycan mesh that provides structural integrity to bacterial membranes. As a result the bacteria lose osmotic stability and undergo lysis during active growth. The drug exhibits activity against many gram-positive and select gram-negative organisms when administered orally or intravenously. Clinical use is limited to infections of the respiratory tract skin and urinary tract where susceptibility testing indicates appropriateness.

Common side effects include stomach upset and diarrhea. Some patients may experience rash or itching. Less frequent nausea or vomiting can occur. Headache and dizziness are also reported. Rarely allergic reactions such as swelling may develop. These effects are generally mild and transient. Monitoring symptoms helps ensure timely management.

Cephalexin is a cephalosporin antibiotic used to treat bacterial infections. Common side effects include mild stomach upset, diarrhea, and nausea. Some people may experience skin rash, itching, or hives as an allergic reaction. Rarely, the medication can cause more serious issues such as low blood cell counts or liver enzyme abnormalities. These reactions are usually reversible after the drug is stopped, but they can vary from person to person. Taking the full prescribed course helps reduce the chance of developing resistance. Overall, most users tolerate Cephalexin well when it is used appropriately.