Last Updated: June 9, 2026

OMNIPEN (AMPICILLIN) Drug Patent Profile


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Which patents cover Omnipen (ampicillin), and what generic alternatives are available?

Omnipen (ampicillin) is a drug marketed by Wyeth Ayerst and is included in two NDAs.

The generic ingredient in OMNIPEN (AMPICILLIN) is ampicillin/ampicillin trihydrate. Three suppliers are listed for this compound. Additional details are available on the ampicillin/ampicillin trihydrate profile page.

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Questions you can ask:
  • What is the 5 year forecast for OMNIPEN (AMPICILLIN)?
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  • What is Average Wholesale Price for OMNIPEN (AMPICILLIN)?
Summary for OMNIPEN (AMPICILLIN)
US Patents:0
Applicants:1
NDAs:2
Raw Ingredient (Bulk) Api Vendors: 61
DailyMed Link:OMNIPEN (AMPICILLIN) at DailyMed

US Patents and Regulatory Information for OMNIPEN (AMPICILLIN)

Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Exclusivity Expiration
Wyeth Ayerst OMNIPEN (AMPICILLIN) ampicillin/ampicillin trihydrate CAPSULE;ORAL 060624-001 Approved Prior to Jan 1, 1982 DISCN No No ⤷  Start Trial ⤷  Start Trial ⤷  Start Trial
Wyeth Ayerst OMNIPEN (AMPICILLIN) ampicillin/ampicillin trihydrate FOR SUSPENSION;ORAL 060625-002 Approved Prior to Jan 1, 1982 DISCN No No ⤷  Start Trial ⤷  Start Trial ⤷  Start Trial
Wyeth Ayerst OMNIPEN (AMPICILLIN) ampicillin/ampicillin trihydrate CAPSULE;ORAL 060624-002 Approved Prior to Jan 1, 1982 DISCN No No ⤷  Start Trial ⤷  Start Trial ⤷  Start Trial
Wyeth Ayerst OMNIPEN (AMPICILLIN) ampicillin/ampicillin trihydrate FOR SUSPENSION;ORAL 060625-001 Approved Prior to Jan 1, 1982 DISCN No No ⤷  Start Trial ⤷  Start Trial ⤷  Start Trial
Wyeth Ayerst OMNIPEN (AMPICILLIN) ampicillin/ampicillin trihydrate FOR SUSPENSION;ORAL 060625-004 Approved Prior to Jan 1, 1982 DISCN No No ⤷  Start Trial ⤷  Start Trial ⤷  Start Trial
Wyeth Ayerst OMNIPEN (AMPICILLIN) ampicillin/ampicillin trihydrate FOR SUSPENSION;ORAL 060625-003 Approved Prior to Jan 1, 1982 DISCN No No ⤷  Start Trial ⤷  Start Trial ⤷  Start Trial
>Applicant >Tradename >Generic Name >Dosage >NDA >Approval Date >TE >Type >RLD >RS >Patent No. >Patent Expiration >Product >Substance >Delist Req. >Exclusivity Expiration

OMNIPEN (Ampicillin): Market Dynamics and Financial Trajectory

Last updated: April 26, 2026

OMNIPEN is an ampicillin product. Ampicillin is a mature, largely commodity-level antibiotic with pricing and demand driven by generics, hospital purchasing cycles, supply reliability, and country-specific reimbursement and antibiotic stewardship rules. Financial trajectory typically tracks the generic life-cycle: peak revenue occurs around introduction and early exclusivity windows, followed by margin compression as competitors expand and as payers and regulators tighten antibiotic use.

What does OMNIPEN imply for market positioning?

OMNIPEN contains ampicillin, placing it in a crowded segment of beta-lactam antibiotics where differentiation is usually limited to:

  • Formulation and route (oral vs injectable where applicable)
  • Presentation format and pack size that match national procurement standards
  • Regulatory status and local manufacturing or sourcing continuity
  • Supply reliability under procurement frameworks

For investors and operators, the practical read-through is that OMNIPEN’s market share and revenue are determined less by patent-driven exclusivity (ampicillin is long out of primary protection) and more by contracting, tender wins, and distributor channel execution.

Competitive set structure (typical for ampicillin)

Ampicillin competes directly and indirectly with:

  • Other aminopenicillins (where local availability exists)
  • Cephalosporins and other beta-lactams used in empiric hospital protocols
  • Broad-spectrum antibiotics preferred under certain resistance or severity profiles
  • Country-level procurement “switches” when guidelines or antibiograms shift

Market access tends to be governed by formulary placement and hospital tender specifications rather than brand-led demand.

How do antibiotic stewardship and guidelines shape demand?

Ampicillin demand is constrained by policy and clinical practice, with two reinforcing forces:

  1. Antibiotic stewardship limits broad use and restricts use to guideline-supported indications or culture-driven therapy.
  2. Resistance patterns determine empiric selection. Rising resistance reduces first-line use, pushing utilization toward narrower or alternative agents.

Stewardship effects show up in:

  • Reduced utilization rates or shorter treatment durations
  • Increased dependence on local antibiograms and physician preference
  • Procurement changes in hospitals that update treatment pathways

Because OMNIPEN is not a novel mechanism, volume growth is difficult to generate through clinical novelty; it must come from tender wins, conversion from alternative agents, or expansion in settings where ampicillin remains guideline-appropriate.

What drives pricing and margin in OMNIPEN’s category?

Ampicillin pricing is primarily determined by generic supply and buyer leverage. Key market dynamics:

  • Tender-based pricing: hospitals and government buyers set or pressure pricing through competitive bidding.
  • Short replenishment lead times: antibiotics are frequently managed with inventory targets that reduce the risk of stockouts but also encourage rapid price discovery.
  • Multi-supplier availability: the presence of multiple manufacturers erodes brand premium.
  • Regulatory compliance costs: manufacturing quality systems, pharmacovigilance, and inspections are fixed costs that typically compress gross margins unless scale is achieved.

Typical financial implication for mature ampicillin products

  • Revenue can remain stable in volume if procurement contracts persist.
  • Gross margin tends to compress as competitors undercut pricing.
  • Operating margin becomes highly sensitive to:
    • utilization and manufacturing yields
    • freight and raw material costs
    • tender margin commitments
    • distribution and rebate structures

How do channel dynamics affect sales trajectory?

For antibiotic generics, channel outcomes dominate the revenue curve:

  • Government and hospital tenders drive bulk of use in many markets. A successful tender can lock volume for a period, but renewal depends on pricing and supply performance.
  • Wholesale distribution influences availability and conversion. Stockouts or uneven distribution can lead to loss of formulary preference and downstream conversion.
  • Private sector variability: in some markets, private hospitals and outpatient settings can sustain brand familiarity, but antibiotics still face guideline-based prescribing and regulatory monitoring.

Share gains and losses behave like procurement math

OMNIPEN’s trajectory is likely to show step-changes rather than smooth growth:

  • Step up after tender awards or formulary listing.
  • Step down when contracts end, pricing resets, or buyers switch to alternatives.

What is the likely financial trajectory for OMNIPEN?

Without a live dataset for OMNIPEN’s specific market history in each geography, the category-level trajectory for ampicillin generics is the actionable baseline:

Revenue pattern

  • Early phase: introduction and formulary entry can create a higher run-rate.
  • Mid phase: as more generic competitors enter or as purchasing centralizes, revenue shifts from brand-driven growth to contract-driven stability.
  • Late phase: mature demand often plateaus or declines modestly if guidelines restrict use or if alternative antibiotics take share.

Profit and cash flow pattern

  • Gross margin: compresses over time as pricing competition intensifies.
  • Cash conversion: depends on working capital cycles in tender and hospital procurement systems.
  • Volume volatility: can be modest but sharp in case of supply disruptions.
  • Cost structure: fixed regulatory and QA costs mean margins depend on throughput and production efficiency.

Scenario framework for financial trajectory (category baseline)

For a mature ampicillin product, the most common outcomes are:

  • Stable revenue, shrinking margin under ongoing generics pressure.
  • Revenue decline, margin stability if pricing floor is maintained but volume falls due to stewardship and guideline shifts.
  • Revenue stability with periodic margin resets when procurement renewals drive new price bands.

In investment and R&D planning, this implies that “growth” is usually achieved via operational advantages (supply reliability, tender execution, cost leadership) rather than clinical differentiation.

Where are investment risks concentrated?

The risk profile for OMNIPEN as a mature antibiotic product concentrates in operational and regulatory domains:

  • Supply continuity risk: antibiotics face procurement penalties and formulary withdrawal if availability fails.
  • Regulatory inspection risk: manufacturing compliance events can temporarily suspend supply and create lost tender slots.
  • Pricing pressure: repeat tender cycles can drive price resets that outpace cost reductions.
  • Clinical guideline shifts: resistance-driven selection can divert use away from ampicillin.
  • Trade and raw material volatility: beta-lactam supply chains can experience input cost swings.

These risks usually affect revenue earlier than they affect long-term demand, because procurement contracts respond quickly to pricing and availability.

What would a credible market thesis look like for OMNIPEN?

A high-confidence thesis for a mature ampicillin branded generic typically hinges on measurable execution levers:

  1. Tender execution: winning and maintaining contracts with minimum price erosion versus peer suppliers.
  2. Cost leadership: manufacturing scale, yield performance, and procurement optimization to protect gross margin through price resets.
  3. Distribution reliability: consistent supply to avoid formulary loss and outpatient conversion leakage.
  4. Targeted positioning: aligning to indications and protocols where ampicillin remains guideline-appropriate in the geography.

Without new clinical advantages, the “financial engine” is procurement and operations.

Market dynamics by geography: how rules change the curve

Antibiotic markets vary widely by country due to:

  • reimbursement mechanisms and hospital procurement models
  • prescribing surveillance and antibiotic monitoring programs
  • restrictions on inpatient versus outpatient use
  • local resistance landscapes and guideline updates

The general pattern is that countries with stronger stewardship frameworks and rapid guideline updates show more pronounced volume pressure. Countries with centralized procurement and stable reimbursement can preserve volume longer, even as pricing falls.

Key metrics to track for OMNIPEN’s financial trajectory

For decision-grade monitoring, track:

  • Tender award frequency and renewal dates
  • Average realized price per unit versus comparator ampicillin suppliers
  • Volume sold by route/form (injectable vs oral if applicable) and pack conversion
  • Gross margin trend segmented by manufacturing plant and batch yields
  • Inventory turns and days sales outstanding tied to public buyer cycles
  • Supply interruption events and their impact on subsequent tender awards
  • Utilization indicators aligned to stewardship (where available)

What role does patent status play?

For ampicillin, patent-driven pricing power is not a realistic driver for modern brand economics. The operational reality is:

  • demand does not rely on exclusivity
  • pricing and margin depend on competitive generic supply conditions
  • product value comes from supply reliability, manufacturing cost, and contracting execution

How does OMNIPEN fit into broader antibiotic market trends?

Antibiotic markets in general face:

  • tighter antibiotic use oversight
  • shifts toward newer agents in some hospital protocols
  • increased preference for targeted therapy when culture results permit
  • ongoing generic price competition in older antibiotics

This makes the long-term trajectory of older beta-lactams more sensitive to utilization policy. For OMNIPEN, growth is therefore more likely to be bounded by contracting and substitution dynamics than by clinical adoption.

Competitive pressure: why it matters to the financial line

In a generic antibiotic segment, the financial line is shaped by:

  • number of suppliers in tender panels
  • regulatory approvals that expand eligible bidders
  • ability to supply at tender price points
  • manufacturing redundancy (single-site risk can translate to missed contract volume)

A product’s revenue survival usually depends on maintaining eligibility and supply continuity, while profit depends on cost competitiveness.


Key Takeaways

  • OMNIPEN (ampicillin) operates in a mature, commodity-like antibiotic market where revenue is procurement-driven and margins compress as generic competition intensifies.
  • The financial trajectory is typically stable volume with declining or reset margins, punctuated by step-changes around tender renewals and stewardship-driven utilization shifts.
  • The dominant value drivers are supply reliability, cost leadership, and contract execution, not patent exclusivity or clinical differentiation.
  • Key risks cluster around tender pricing resets, manufacturing compliance/supply interruptions, and guideline or resistance changes that reduce first-line ampicillin use.
  • Decision-grade monitoring should focus on tender awards, realized price, volume stability, gross margin, and supply continuity metrics.

FAQs

  1. What is the most likely revenue pattern for OMNIPEN?
    Step-driven procurement outcomes: stable volume when contracts renew, with declines when buyers reset pricing or shift empiric protocols.

  2. Why do margins compress for OMNIPEN-type products?
    Generic supply breadth increases buyer leverage in tender pricing, while fixed regulatory and manufacturing quality costs limit flexibility.

  3. What most directly changes demand for ampicillin?
    Antibiotic stewardship enforcement, resistance patterns that alter empiric selection, and guideline updates that determine first-line versus restricted use.

  4. What operational factor has the biggest impact on continuity of sales?
    Manufacturing and distribution reliability that prevents stockouts and preserves eligibility in tender panels.

  5. Does patent status drive OMNIPEN economics?
    For ampicillin, the category’s pricing power is typically not exclusivity-driven; contracting, supply, and cost dominate.


References

[1] World Health Organization. (2022). Global action plan on antimicrobial resistance. https://www.who.int/
[2] Centers for Disease Control and Prevention. (2024). Core elements of hospital antibiotic stewardship programs. https://www.cdc.gov/
[3] European Centre for Disease Prevention and Control. (2023). Antimicrobial resistance surveillance and antibiotic stewardship guidance. https://www.ecdc.europa.eu/
[4] FDA. (2023). Antimicrobial resistance and stewardship resources. https://www.fda.gov/

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