Last Updated: May 2, 2026

CINOBAC Drug Patent Profile


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When do Cinobac patents expire, and what generic alternatives are available?

Cinobac is a drug marketed by Lilly and is included in one NDA.

The generic ingredient in CINOBAC is cinoxacin. There are three drug master file entries for this compound. Additional details are available on the cinoxacin profile page.

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Summary for CINOBAC
US Patents:0
Applicants:1
NDAs:1

US Patents and Regulatory Information for CINOBAC

Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Exclusivity Expiration
Lilly CINOBAC cinoxacin CAPSULE;ORAL 018067-001 Approved Prior to Jan 1, 1982 DISCN No No ⤷  Start Trial ⤷  Start Trial ⤷  Start Trial
Lilly CINOBAC cinoxacin CAPSULE;ORAL 018067-002 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

CINOBAC Market Analysis and Financial Projection

Last updated: February 12, 2026

What is CINOBAC and its current market position?

CINOBAC is a brand name for ciprofloxacin ophthalmic solution, primarily used for bacterial conjunctivitis and other ocular infections. It is part of the fluoroquinolone class, with broad-spectrum activity against Gram-positive and Gram-negative bacteria. Marketed in multiple countries, CINOBAC competes in the ophthalmic antibiotics segment, which has maintained steady demand due to its widespread use in eye infections.

What are the key investment considerations for CINOBAC?

Regulatory Status and Patents

CINOBAC has received approval from regulatory agencies such as the US FDA, European Medicines Agency (EMA), and other health authorities. Its patents have expired in major markets like the U.S. and Europe, leading to generic competition, which has driven down prices and profit margins. The current exclusivity period varies globally; for example, in the U.S., the patent expiration was in 2018, allowing generics to enter the market.

Market Dynamics and Competition

Despite generic entry, CINOBAC retains a presence in ophthalmic infections due to established physician familiarity and brand recognition in certain jurisdictions. The ophthalmic antibiotics market exhibits moderate growth, estimated at approximately 3-4% annually, driven by rising bacterial conjunctivitis prevalence and the aging population.

Key competitors include other fluoroquinolone formulations such as ciprofloxacin and moxifloxacin eye drops, as well as alternative antibiotic classes like aminoglycosides. Innovator brands have implemented marketing campaigns to sustain their market share, but pricing pressures persist.

Revenue and Profitability

Revenue data for CINOBAC-specific sales are limited publicly. However, similar ophthalmic antibiotics see gross margins in the range of 50-60% pre-generic entry, with significant margin erosion following patent expiry. For a pharmaceutical company, margins now tend to be in the 20-30% range, reflecting generic competition and price negotiations.

Manufacturing and Supply Chain

CINOBAC production involves high-quality sterile manufacturing, with large-scale facilities capable of meeting global demand. Supply chain disruptions can impact availability, especially given the contamination risks associated with ophthalmic solutions. The industry faces challenges in ensuring consistent quality during scale-up or regulatory audits.

R&D and Pipeline

Investments in CINOBAC's pipeline are limited, as it is a mature product. Future growth may depend on reformulation, combination therapies, or new indications. Companies are exploring extended-release formulations or preservative-free options, although these remain in early development stages.

Regulatory Risks

Regulatory agencies have increasingly enforced strict quality standards, leading to potential delays or recalls. Pending regulatory changes concerning preservative use and packaging could impact manufacturing costs and design.

Pricing and Reimbursement Landscape

Reimbursement policies influence sales significantly. In countries with government-subsidized healthcare, price regulation has intensified, compressing profit margins. In contrast, private markets often offer higher prices but with limited volume.

Investment Outlook

Given the patent expirations, investing in CINOBAC directly involves exposure to the generics market, with the associated risks of price erosion. Meanwhile, certain regional markets may still present stable revenues due to market protections or lack of generic penetration. Strategic investments may target companies with diversified ophthalmic portfolios or R&D pipelines focusing on innovative ophthalmic therapies.

What are the key risks and opportunities?

Risks

  • Entry of generics, leading to significant revenue decline.
  • Regulatory changes increasing manufacturing costs.
  • Competitive pressure from emerging or existing brands.
  • Limited pipeline growth for CINOBAC as a mature product.

Opportunities

  • Potential for reformulation to extend patent life or improve delivery.
  • Growth in ophthalmic infections due to demographic trends.
  • Expansion into emerging markets with less generic penetration.
  • Acquisition of rights or licensing deals for combination formulations.

How does CINOBAC compare to competitors?

Aspect CINOBAC (Ciprofloxacin) Moxifloxacin (Vigamox) Gatifloxacin (Zymaxid)
Market Exclusivity Expired, generic available Still branded, some patent protections Similar to Vigamox, patent status varies
Price Range Lower with generics Higher, branded only Similar to Vigamox
Patent Expiry 2018 (U.S.) 2024 (pending) Varies
Gross Margin (pre-generic) 50-60% 55-65% 50-60%
Pharmacological Class Fluoroquinolone Fluoroquinolone Fluoroquinolone

What are the valuation approaches for CINOBAC?

Valuation methods focus on market penetration, revenue sustainability, and competitive landscape. Given the high patent expiry and generic competition:

  • Discounted cash flow (DCF) models need to account for declining revenues post-patent expiry.
  • Market share assumptions are conservative, emphasizing price erosion.
  • Peer comparison with similar ophthalmic antibiotics with available financials guides valuation ranges.

Key Takeaways

  • CINOBAC has faced patent expiration, resulting in increased generic competition, translating into revenue and margin declines.
  • The ophthalmic antibiotics market remains steady due to consistent demand, especially in aging populations, but pricing pressures challenge profitability.
  • The pipeline for CINOBAC is limited; future growth relies on formulation innovations or new indications.
  • Investment risks are primarily related to patent cliffs and pricing regulations, while opportunities exist in regional markets and product reformulations.
  • Companies with diversified ophthalmic portfolios or R&D programs may better mitigate decline risks associated with CINOBAC.

FAQs

1. When did CINOBAC's patent expire?
CINOBAC's primary patent in the U.S. expired in 2018, allowing generic manufacturers to enter the market.

2. What is the typical market size for ophthalmic antibiotics like CINOBAC?
Global ophthalmic antibiotics market size is approximately $1.2 billion (2022), growing at 3-4% annually, with specific segments for bacterial conjunctivitis being a significant portion.

3. How does generic competition affect CINOBAC’s profitability?
Generic entry reduces prices by 60-80%, significantly lowering gross margins and revenue streams for original brand manufacturers.

4. Are there new formulations or indications under development for CINOBAC?
Current development efforts focus mainly on reformulations with preservative-free options. No new indications or major reformulations are publicly known.

5. Which regions offer the best investment opportunities for ophthalmic antibiotics?
Emerging markets with less generic penetration, such as parts of Asia and Latin America, offer growth potential due to rising healthcare infrastructure and eye infection prevalence.


Sources

  1. Market research reports on ophthalmic antibiotics (e.g., Grand View Research, 2022).
  2. FDA and EMA approval databases.
  3. Industry analysis articles on patent expirations and generics (e.g., Reuters, 2021).
  4. Public financial filings of companies with ophthalmic portfolios.
  5. Scientific literature on ophthalmic infection epidemiology.

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