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Last reviewed 2026-05-16 · How we verify

Optimer Pharmaceuticals LLC, a subsidiary of Merck & Co., Inc. (Rahway, New Jersey USA) — Portfolio Competitive Intelligence Brief

Name: Drug Landscape Pharmaceutical Database
Creator: Drug Landscape
Published: 2026-01-01
License: https://creativecommons.org/licenses/by/4.0/

Optimer Pharmaceuticals LLC, a subsidiary of Merck & Co., Inc. (Rahway, New Jersey USA) pipeline: 0 marketed, 0 filed, 2 Phase 3, 0 Phase 2. Recent regulatory actions, upcoming PDUFA, patent timeline, top competitor overlap.

0 marketed 0 filed 2 Phase 3 0 Phase 2 0 Phase 1 Live · 30-min refresh

Portfolio leaders (marketed + Phase 3 / filed)

Drug	Generic	Phase	Class	Target	Area	First approval
Matching Placebo to Fidaxomicin	Matching Placebo to Fidaxomicin	phase 3			Infectious Disease
PAR-101/OPT-80	PAR-101/OPT-80	phase 3	Non-systemic antibiotic; bacterial RNA polymerase inhibitor	Bacterial RNA polymerase (C. difficile)	Infectious Disease

Therapeutic area mix

Infectious Disease · 2

Recent regulatory actions (last 90 days)

No regulatory actions in the last 90 days for this portfolio.

Upcoming PDUFA dates (next 180 days)

No PDUFA dates in the next 180 days for this portfolio.

Patent timeline (forward window)

No upcoming patent expiries for this portfolio.

Competitive overlap (companies sharing drug classes)

No competitive overlap data.

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Every new pipeline event for Optimer Pharmaceuticals LLC, a subsidiary of Merck & Co., Inc. (Rahway, New Jersey USA):

Cite this brief

Drug Landscape (2026). Optimer Pharmaceuticals LLC, a subsidiary of Merck & Co., Inc. (Rahway, New Jersey USA) — Portfolio Competitive Intelligence Brief. https://druglandscape.com/ci/company/optimer-pharmaceuticals-llc-a-subsidiary-of-merck-co-inc-rahway-new-jersey-usa. Accessed 2026-05-16.