The type segment distinguishes molecular stability, renal liability and spectrum, directly shaping procurement budgets. Imipenem-cilastatin, the first-in-class, retains >30 % share in cost-sensitive markets owing to generic availability, but its dose-limiting seizure risk and susceptibility to metallo-β-lactamases cap growth. Meropenem is the reference therapy for ESBL and Pseudomonas coverage, generating the highest volume in in-patient settings; the patent expiry in 2022 triggered a 60 % price erosion, expanding volume in middle-income countries. Ertapenem, with a once-daily regimen and absence of anti-pseudomonal activity, is preferred for ESBL-only infections and outpatient parenteral therapy, reducing length-of-stay costs. Doripenem, though costlier, offers the lowest resistance potential and is reserved for MDR Pseudomonas outbreaks, accounting for <5 % of the market. Biapenem and Tebipenem are investigational oral agents; if approved, they could extend the market into step-down therapy, adding an estimated USD 180 million by 2028.