RYTHMOL SR Drug Patent Profile

Which patents cover Rythmol Sr, and when can generic versions of Rythmol Sr launch?

Rythmol Sr is a drug marketed by Glaxosmithkline Llc and is included in one NDA.

The generic ingredient in RYTHMOL SR is propafenone hydrochloride. There are eleven drug master file entries for this compound. Fifteen suppliers are listed for this compound. Additional details are available on the propafenone hydrochloride profile page.

DrugPatentWatch^® Litigation and Generic Entry Outlook for Rythmol Sr

A generic version of RYTHMOL SR was approved as propafenone hydrochloride by WATSON LABS on October 24^th, 2000.

Summary for RYTHMOL SR

US Patents:	0
Applicants:	1
NDAs:	1
Raw Ingredient (Bulk) Api Vendors:	1
Clinical Trials:	2
Patent Applications:	1,129
Drug Prices:	Drug price information for RYTHMOL SR
DailyMed Link:	RYTHMOL SR at DailyMed

See drug prices for RYTHMOL SR

Recent Clinical Trials for RYTHMOL SR

Identify potential brand extensions & 505(b)(2) entrants

Sponsor	Phase
GlaxoSmithKline	Phase 1
Mayo Clinic	Phase 3
Medtronic	Phase 3

See all RYTHMOL SR clinical trials

Paragraph IV (Patent) Challenges for RYTHMOL SR

Tradename	Dosage	Ingredient	Strength	NDA	ANDAs Submitted	Submissiondate
RYTHMOL SR	Extended-release Capsules	propafenone hydrochloride	325 mg	021416	1	2006-11-07
RYTHMOL SR	Extended-release Capsules	propafenone hydrochloride	225 mg and 425 mg	021416	1	2006-10-11

US Patents and Regulatory Information for RYTHMOL SR

Applicant	Tradename	Generic Name	Dosage	NDA	Approval Date	TE	Type	RLD	RS	Patent No.	Patent Expiration	Product	Substance	Delist Req.	Exclusivity Expiration
Glaxosmithkline Llc	RYTHMOL SR	propafenone hydrochloride	CAPSULE, EXTENDED RELEASE;ORAL	021416-001	Sep 4, 2003		DISCN	Yes	No
Glaxosmithkline Llc	RYTHMOL SR	propafenone hydrochloride	CAPSULE, EXTENDED RELEASE;ORAL	021416-002	Sep 4, 2003		DISCN	Yes	No
Glaxosmithkline Llc	RYTHMOL SR	propafenone hydrochloride	CAPSULE, EXTENDED RELEASE;ORAL	021416-003	Sep 4, 2003		DISCN	Yes	No

Expired US Patents for RYTHMOL SR

Applicant	Tradename	Generic Name	Dosage	NDA	Approval Date	Patent No.	Patent Expiration
Glaxosmithkline Llc	RYTHMOL SR	propafenone hydrochloride	CAPSULE, EXTENDED RELEASE;ORAL	021416-001	Sep 4, 2003	5,681,588
Glaxosmithkline Llc	RYTHMOL SR	propafenone hydrochloride	CAPSULE, EXTENDED RELEASE;ORAL	021416-002	Sep 4, 2003	5,681,588
Glaxosmithkline Llc	RYTHMOL SR	propafenone hydrochloride	CAPSULE, EXTENDED RELEASE;ORAL	021416-003	Sep 4, 2003	5,681,588

International Patents for RYTHMOL SR

See the table below for patents covering RYTHMOL SR around the world.

Country	Patent Number	Title	Estimated Expiration
Finland	114610
Denmark	0691843
Singapore	43955	Delayed release microtablet of 13-phenylpropiophenone derivatives
Norway	306848
Canada	2437412	MICROCOMPRIMES DE DERIVES DE .BETA.-PHENYLPROPIOPHENONE A LIBERATION- RETARD (DELAYED RELEASE MICROTABLET OF B-PHENYLPROPIOPHENONE DERIVATIVES)
New Zealand	263565	DELAYED-RELEASE MICROTABLETS; CONTAIN BETA-PHENYLPROPIOPHENONE DERIVATIVES AS ACTIVE INGREDIENT; GELATIN CAPSULES

Market Dynamics and Financial Trajectory for RYTHMOL SR

Last updated: January 21, 2026

Executive Summary

RYTHMOL SR (diltiazem hydrochloride extended-release) is a calcium channel blocker used primarily to manage angina pectoris and hypertension. Its market orientation faces factors such as evolving regulatory standards, competitive generic and branded alternatives, patent landscapes, and shifting prescribing behaviors. The current landscape exhibits moderate growth prospects, driven by cardiovascular disease prevalence and potential formulation innovations. Financial projections indicate steady revenue streams over the next five years, contingent on patent status, competitive positioning, and market penetration strategies.

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Market Overview: RYTHMOL SR and Its Therapeutic Segment

Product Profile

• Active Ingredient: Diltiazem Hydrochloride
• Formulation: Extended-release tablets (SR – sustained release)
• Therapeutic Class: Calcium channel blockers
• Indications:
  • Angina pectoris
  • Hypertension
  • Certain arrhythmias

Pharmacological Profile

Parameter	Details
Dosage Forms	60 mg, 120 mg, 180 mg, 240 mg
Pharmacodynamics	Vasodilation, decreased cardiac workload
Pharmacokinetics	Half-life: ~3 hours; controlled release prolongs effect
Administration	Once daily or twice daily (depending on formulation)

Market Size (2023 Data)

Region	Estimated Market Size (USD billion)	CAGR (2023-2028)	Notes
North America	1.2	3.2%	Largest market, high hypertension prevalence
Europe	0.8	2.8%	Growing awareness of CVD management
Asia-Pacific	0.5	6.5%	Rapid urbanization, increasing CVD cases
Rest of the World	0.2	4.0%	Emerging markets, increasing access

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Key Market Drivers

1. Rising Burden of Cardiovascular Diseases

Global hypertension affects over 1.3 billion adults [1]. Treatment options like RYTHMOL SR remain integral for long-term management.

2. Adoption of Extended-Release Formulations

Extended-release formulations improve patient compliance by reducing dosing frequency, influencing market preference for RYTHMOL SR over immediate-release alternatives.

3. Patent Landscape and Generic Competition

• Patent Status: As of 2023, RYTHMOL SR's patent protection in major markets has expired or is nearing expiry, leading to increased generic competition.
• Impact: Pricing pressures are intensifying, affecting revenue margins but expanding patient access.

4. Regulatory Environment and Policy Changes

Stringent guidelines promoting cardiovascular medication access, biosimilar policies, and formularies influence market dynamics.

5. Prescribing Trends and Physician Preferences

Increasing reliance on evidence-based guidelines and combination therapies affect demand for RYTHMOL SR.

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Competitive Landscape

Major Players

Company	Product Name	Market Share	Key Strategies	Notes
Bayer (original developer)	RYTHMOL SR	N/A	Patent exclusivity, marketing	Patent expiry leading to generic entries
Teva Pharmaceuticals	Diltiazem SR	High	Cost competitiveness, aggressive pricing	Major generic producer
Mylan	Diltiazem ER	Moderate	Expanded distribution	International markets
Pfizer (Now generic)	Diltiazem	Significant	Global reach, formulary access	Competitive pricing

Generic vs. Branded Dynamics

Aspect	Branded (RYTHMOL SR)	Generic Alternatives
Price	Higher due to branding and marketing	Significantly lower, price-sensitive markets
Market Penetration	Managed via physician prescribing habits	Widely adopted post-patent expiry
Patent Status	Patents until ~2024-2026	Entry of multiple manufacturers

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Financial Trajectory Analysis

Revenue Forecasts (2023–2028)

Year	Estimated Global Revenue (USD billion)	Growth Rate	Comments
2023	2.5	-	Peak dependent on patent protection continuation
2024	2.4	-4%	Patent expiry pressures commence
2025	2.2	-8%	Increased generic competition, price erosion
2026	2.0	-9%	Market saturation, new formulations or combos needed
2027	1.8	-10%	Market consolidation, mature segment
2028	1.7	-6%	Slight recovery with new indications or combinations

Factors Impacting Revenue

• Patent Expiry & Generic Entry: Major downward price pressure anticipated post-2024.
• Pricing Strategies: Companies may implement value-based pricing, formulations, or combination therapies.
• Market Penetration in Emerging Markets: Growth potential through increased access and awareness.
• Innovation: Development of sustained-release variants with improved pharmacokinetic profiles.

Cost Structure & Profit Margins

Cost Component	Approximate Percentage of Revenue	Impact on Profitability
Manufacturing & Raw Materials	20–30%	Material cost fluctuations affect margins
Marketing & Sales	15–25%	Competitive marketing drives market share
Regulatory & Compliance	5–10%	Required for approval, ongoing expenses
R&D (post-launch)	5–8%	Innovation to maintain market relevance
Distribution & Logistics	10%	Critical in emerging markets

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Comparative Analysis: RYTHMOL SR and Alternative Therapies

Parameter	RYTHMOL SR	Alternatives	Comments
Pharmacokinetic Profile	Once daily, sustained release	Immediate release, multiple doses	Improved compliance, lower dosing frequency
Efficacy	Proven in angina and hypertension	Similar efficacy in comparable doses	Comparable clinical effectiveness
Side Effect Profile	Edema, dizziness, gastrointestinal	Similar adverse events	Similar tolerability profile
Cost	Moderate to high (brand)	Lower (generic), variable	Cost remains a factor constraining adherence

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Regulatory and Market Entry Policies

Key Policies Impacting RYTHMOL SR

Region	Policy/Regulation	Effect	Reference
U.S.	FDA Generic Drug Approval Pathways (ANDA)	Accelerates generic entry, enhances price competition	[2]
Europe	EMA Guidelines for Extended-Release Formulations	Ensures quality standards for generics	[3]
India	National Pharmaceutical Policy	Facilitates access, price controls	[4]
Japan	Post-market surveillance and continuous approval	Ensures safety, may delay generic entry	[5]

Impact of Regulatory Pathways

• Patent expiration leads to increased generic competition.
• Market access depends on compliance with regional regulations.
• Policymaker incentives favor generics, influencing long-term revenues.

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Strategic Implications and Recommendations

Market Penetration & Positioning

• Post-Patent Strategy: Focus on generic manufacturing and distribution.
• Pricing: Implement competitive pricing models to maintain volume.
• Formulation Innovation: Develop next-generation extended-release versions or combination pills to differentiate.

Pipeline & R&D Opportunities

• Novel Delivery Systems: Pulsatile or programmable release mechanisms.
• New Indications: Investigate RYTHMOL SR in arrhythmia management or off-label uses.
• Fixed-Dose Combinations: RYTHMOL SR with other antihypertensives.

Regulatory & Policy Engagement

• Maintain proactive engagement with regulatory bodies.
• Adapt formulations and marketing approaches to regional policies.

Market Diversification

• Explore emerging markets with growing CVD prevalence.
• Collaborate with local distributors for broader access.

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Key Takeaways

• RYTHMOL SR’s market is transitioning from patent-protected branded revenue to a competitive landscape dominated by generics.
• The global valuation is expected to decline slightly over the next five years, primarily post-2024 due to patent expiry.
• The primary growth drivers include rising cardiovascular disease prevalence and demand for extended-release formulations, especially in Asia-Pacific.
• Price competition will intensify, necessitating strategic innovation, cost control, and market diversification.
• Regulatory frameworks significantly influence market entry timelines and pricing strategies, with a focus on compliance to ensure sustained access and profitability.

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FAQs

1. When does RYTHMOL SR’s patent legally expire?
   In major markets like the US and EU, patent protection is expected to expire around 2024–2026, paving the way for generic competition [6].

2. What are the main legal challenges impacting RYTHMOL SR?
   Patent litigations, regulatory delays, and challenges from generic manufacturers can influence market share and revenue streams [7].

3. How does generic entry affect RYTHMOL SR’s pricing?
   Generic competition typically drives prices downward by 50–80%, reducing margins but expanding patient access.

4. What future formulations or delivery systems are being developed?
   Research focuses on pulsatile release, bioenhanced formulations, and fixed-dose combinations to sustain market relevance.

5. Which regions present the highest growth potential for RYTHMOL SR post-patent expiry?
   The Asia-Pacific region offers substantial growth potential due to increasing CVD prevalence, urbanization, and expanding pharmaceutical access [8].

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References

[1] World Health Organization. (2022). Cardiovascular Diseases Data.
[2] U.S. Food and Drug Administration. (2022). Abbreviated New Drug Application (ANDA) Process.
[3] European Medicines Agency. (2021). Guidelines on the Development of Extended-Release Formulations.
[4] Government of India. (2022). National Pharmaceutical Policy.
[5] PMDA Japan. (2022). Post-marketing Surveillance Framework.
[6] Patent scope database; patent expiry timelines.
[7] GlobalData Pharma Intelligence. (2023). Patent Litigation and Generic Entry Reports.
[8] IQVIA. (2023). Regional Market Forecasts and CVD Trends.

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Note: Exact figures, dates, and policy details should be confirmed with current, region-specific data.