Last Updated: June 24, 2026

COLY-MYCIN S Drug Patent Profile


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When do Coly-mycin S patents expire, and when can generic versions of Coly-mycin S launch?

Coly-mycin S is a drug marketed by Ph Health and Parke Davis and is included in two NDAs.

The generic ingredient in COLY-MYCIN S is colistin sulfate. There are four drug master file entries for this compound. Additional details are available on the colistin sulfate profile page.

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Summary for COLY-MYCIN S
Pharmacology for COLY-MYCIN S

US Patents and Regulatory Information for COLY-MYCIN S

Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Exclusivity Expiration
Ph Health COLY-MYCIN S colistin sulfate; hydrocortisone acetate; neomycin sulfate; thonzonium bromide SUSPENSION/DROPS;OTIC 050356-001 Approved Prior to Jan 1, 1982 RX Yes Yes ⤷  Start Trial ⤷  Start Trial ⤷  Start Trial
Parke Davis COLY-MYCIN S colistin sulfate SUSPENSION;ORAL 050355-001 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

COLY-MYCIN S market dynamics and financial trajectory: sales exposure, demand drivers, pricing pressure, and exclusivity risk

Last updated: June 8, 2026

What is COLY-MYCIN S and where does it sell?

COLY-MYCIN S is a branded combination antibiotic product marketed in the US. Market dynamics are dominated by (1) hospital and long-term care formulary access for topical/oral/adjunct antibiotic uses and (2) steady replacement demand driven by treating common bacterial indications. For this brand, financial trajectory typically tracks generic substitution risk rather than pipeline-driven growth.

Commercial profile (how it behaves in the market)

  • Brand antibiotics with established indications generally see flat-to-declining unit growth after peak adoption unless the brand holds formulary positioning or faces limited generic supply.
  • Revenue tends to depend more on net price and wholesaler buying patterns than on patient starts.

How do market dynamics affect COLY-MYCIN S pricing and volume?

Antibiotic brands in mature categories typically face structural pricing headwinds. For COLY-MYCIN S, the key dynamics are:

1) Generic substitution and contracting pressure

  • Managed care rebates and hospital group purchasing organization (GPO) contracts compress net prices.
  • When therapeutically equivalent generics are available, brand net pricing usually declines even if gross sales hold temporarily.

2) Supply chain and sourcing

  • Antibiotic product demand is sensitive to manufacturing continuity. Any supply disruptions can shift market share even without changes in clinical practice.

3) Utilization volatility

  • Antibiotic usage is influenced by stewardship policies and local antibiograms.
  • A shift toward narrower-spectrum therapy can reduce share for older or broader-spectrum brands, even when overall antibiotic use remains stable.

4) Channel mix

  • Hospital and institutional channels often react faster to formulary changes than retail channels, making institutional contracting a key determinant of short-cycle revenue swings.

When does exclusivity end for COLY-MYCIN S, and how does that change the revenue curve?

Brand antibiotic revenue trajectories usually follow a classic inflection pattern:

  • Period of stable demand with discounting/contract pressure
  • Approaching patent or exclusivity end
  • Post-expiration generic entry that drives sustained price erosion

Revenue impact mechanism

  • Even if unit volume remains steady, generic entry typically forces net pricing down.
  • Brand share drops as formularies update and prescribers switch.

Featured snippet answer COLY-MYCIN S revenue exposure is primarily an exclusivity and generic-entry timing problem, not a new-indication adoption story.

What patent estate protects COLY-MYCIN S and how strong is it commercially?

A drug’s financial trajectory in a mature antibiotic category is tightly linked to how defensible its formulation, method-of-use, and manufacturing patents are.

Patent estate categories that matter for revenue

  • Composition of matter (rare for legacy antibiotics)
  • Formulation patents (stability, bioavailability, salt/solvate, particle size)
  • Method-of-use patents (specific dosing regimens or clinical contexts)
  • Manufacturing process patents (control of impurities, granulation, sterilization)
  • Pediatric exclusivity and market exclusivity (if applicable)

Commercial strength indicators

  • Patent breadth across dosage forms and strengths
  • Remaining life on each defensible patent
  • Likelihood of Paragraph IV challenges (where ANDA competitors can carve around)

What generic entry risks exist for COLY-MYCIN S?

Generic entry risks for older antibiotic brands usually come from:

  • ANDAs for the same active(s) and dosage form(s)
  • “Skinny labels” and carve-outs if method-of-use or specific formulation patents are not broad
  • Authorized generics and label-to-label switching in institutional formularies

Risk drivers

  • Number of patents listed for the brand in the FDA Orange Book (more listed patents can raise barrier-to-entry but does not guarantee lasting protection)
  • Expiration schedule across each patent family
  • Prior litigation outcomes (settlements can accelerate or delay generic launches)

How does COLY-MYCIN S compare with other antibiotic brands and generics on market share?

In mature antibiotic categories, competitive outcomes typically fall into two buckets:

  • Brands that maintain institutional preference via contract terms and limited generic supply
  • Brands that lose share rapidly once multiple ANDAs enter and wholesalers rationalize inventory

Competitive yardstick for COLY-MYCIN S

  • Share retention depends on how many effective alternatives are contract-favored
  • Revenue resilience depends on net price discounts relative to generic benchmark prices

What is the Orange Book status of COLY-MYCIN S?

Orange Book status is the key determinant for:

  • How many patents are listed
  • When they expire
  • Whether they block generic entry for specific formulations/strengths

Featured snippet answer Orange Book patent listings and their remaining expiration life define COLY-MYCIN S’s generic launch timing risk.

What FDA regulatory pathway considerations shape COLY-MYCIN S competition?

In mature antibiotic markets, competitive pressure is dominated by ANDA mechanics and label equivalence.

Regulatory factors that drive entry

  • Whether competitors can reference the same reference listed drug (RLD)
  • Bioequivalence requirements and whether the brand has formulation-specific constraints
  • Exclusivity attached to the RLD (if any) that can restrict generic approval timing

What patent litigation affects COLY-MYCIN S market timing?

Patent litigation can delay ANDA approvals and generic launch dates, often through:

  • 30-month stay triggered by a Paragraph IV notice
  • Settlement agreements that establish launch date carve-outs or delayed entry
  • Ongoing appeals that extend uncertainty

How to read litigation risk for financial trajectory

  • The timing of generic availability often matters more than the final merits.
  • Settlements can produce a predictable step-down in sales if entry is delayed to a specific date.

What settlement agreements and licensing deals could shift the revenue outlook?

Revenue outlook shifts when:

  • A brand licenses to an authorized generic producer, stabilizing share briefly while preserving some pricing power
  • A settlement grants exclusivity to a single challenger (exclusive “first filer” or delayed-launch arrangement)
  • A patent owner grants non-exclusive rights that allow multiple generics, accelerating price erosion

What manufacturing or IP barriers could limit generic penetration for COLY-MYCIN S?

Manufacturing constraints can prevent fast market share transfer even after legal exclusivity ends.

Common barriers

  • Batch release complexity and impurity specification control
  • Sterility or handling requirements (if applicable to the marketed dosage form)
  • Equipment validation and site qualification timelines

Financial translation Delayed generic supply produces lagged revenue decline. Fast supply produces immediate price erosion.

Revenue exposure model: how COLY-MYCIN S sales typically evolve under generic entry

A practical financial trajectory framework for mature brands facing generic competition is:

Pre-generic period

  • Net revenue declines at a slower pace as contracts renew and unit demand stabilizes.

Lead-up to exclusivity loss

  • Wholesale buying can temporarily increase.
  • Net price begins to compress further due to competitive anticipation.

Post-generic entry

  • Sales drop in two waves:
    1. Immediate share loss through formulary conversion
    2. Additional price erosion as multiple generics and wholesalers optimize inventory

Long-tail outcome

  • Brand can keep a niche position if institutional preferences persist or if supply constraints limit generic availability.

Key financial trajectory drivers to monitor for COLY-MYCIN S

For business planning and valuation, the measurable drivers are:

  • Net sales trend versus unit trend (price versus volume separation)
  • Wholesaler inventory cycles and ordering behavior
  • Contracting outcomes with hospital systems and GPOs
  • FDA and Orange Book events tied to remaining listed patents for relevant dosage forms/strengths
  • Generic entry signals: ANDA approvals, labeling changes, and shelf availability

Key Takeaways

  • COLY-MYCIN S is a mature antibiotic brand where financial trajectory is determined primarily by generic substitution risk, contracting, and supply continuity rather than by clinical expansion.
  • Revenue typically follows a step-down pattern around exclusivity and patent expiration milestones driven by ANDA entry and pricing compression.
  • The actionable forecast inputs for COLY-MYCIN S are Orange Book patent listing status by dosage form, expiration timing, and the presence or absence of Paragraph IV litigation and settlement-induced launch delays.
  • Manufacturing and supply constraints can materially slow market share transfer even after legal barriers end.

FAQs

1) What drives COLY-MYCIN S net price declines when generics enter?
Contracting and rebate adjustments plus wholesalers shifting to lower-cost equivalents.

2) How can hospital formulary decisions affect COLY-MYCIN S sales faster than retail?
Hospital procurement and switching cycles update quicker through GPO contracts and committee approvals.

3) Do stewardship and antibiogram changes reduce demand for older antibiotic brands like COLY-MYCIN S?
Yes, shifting prescribing toward narrower-spectrum options can reduce brand share even if total antibiotic use stays stable.

4) What indicators suggest an upcoming generic launch for COLY-MYCIN S?
Orange Book listing changes, ANDA approvals, 30-month stay notices, and observed shelf availability of equivalent products.

5) How should investors value COLY-MYCIN S around patent expiry risk?
Use a scenario curve that models share loss on launch plus multi-wave price erosion as additional competitors enter.

References

No sources were provided in the prompt, and no verifiable citations can be produced without access to specific FDA/Orange Book records, litigation dockets, or company financial filings for COLY-MYCIN S.

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