Imipenem is a β-lactam antibiotic and is market in combination with cilastatin a drug that inhibits the degradation of imipenem by renal tubular dipeptidase and extends the elimination half-life of imipenem. Imipenem binds to penicillin-binding proteins, disrupts bacterial cell wall synthesis, and causes depth of susceptible organisms. Imipenem is resistant to hydrolysis by most β-lactamases and is active against a wide variety of aerobic and anaerobic microorganisms. Streptococci (including penicillinase-resistant Streptococcus pneumoniae), Enterococcus faecalis, staphylococci (including penicillinase-producing strains but not methicillin-resistant Staphylococcus aureus), Listeria, Enterobacteriaceae (except for emerging carbapenemase-producing strains), most strains of Pseudomonas and Acinetobacter, and Bacillus fragilis are susceptible to imipenem/cilastatin. Imipenem/cilastatin effectively treats urinarytract, lower respiratory, intraabdominal, gynaecologic, skin, soft-tissue, bone, and joint infections. The efficacy and safely of imipenem/cilastatin and the penetration of imipenem in muscle and in subcutaneous tissues have been reviewed. The pharmacokinetics of imipenem have been studied in heathy volunteers and in patients with severe renal failure and the elimination half-life of imipenem is longer in patients than in healthy volunteers. The treatment of bacterial infections and trials with imipenem/cilastatin have been reviewed. Imipenem penetrates into the cerebrospinal fluid in significant amounts and imipenem/ cilastatin treats the meningitis caused by Haemophilus influenzae type b, Citrobacter diversus, or Acinetobacter anitratus. The aim of this study is to review imipenem/cilastatin efficacy and safely, treatment of bacterial infections, trials, and treatment of bacterial meningitis, imipenem diffusion in tissues, and pharmacokinetics of imipenem and cilastatin and penetration into the cerebrospinal fluid of imipenem and cilastatin.