Imipramine pamoate - Generic Drug Details

What are the generic drug sources for imipramine pamoate and what is the scope of patent protection?

Imipramine pamoate is the generic ingredient in two branded drugs marketed by Hikma, Lupin Ltd, Rising, and Specgx Llc, and is included in four NDAs. Additional information is available in the individual branded drug profile pages.

There are nine drug master file entries for imipramine pamoate. Two suppliers are listed for this compound.

Summary for imipramine pamoate

US Patents:	0
Tradenames:	2
Applicants:	4
NDAs:	4
Drug Master File Entries:	9
Finished Product Suppliers / Packagers:	2
Raw Ingredient (Bulk) Api Vendors:	14
Clinical Trials:	2
Drug Prices:	Drug price trends for imipramine pamoate
What excipients (inactive ingredients) are in imipramine pamoate?	imipramine pamoate excipients list
DailyMed Link:	imipramine pamoate at DailyMed

See drug prices for imipramine pamoate

Recent Clinical Trials for imipramine pamoate

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

Sponsor	Phase
Shalvata Mental Health Center	N/A
Roxane Laboratories	N/A

See all imipramine pamoate clinical trials

Pharmacology for imipramine pamoate

Drug Class

Tricyclic Antidepressant

Anatomical Therapeutic Chemical (ATC) Classes for imipramine pamoate

N06AA	Non-selective monoamine reuptake inhibitors
N06A	ANTIDEPRESSANTS
N06	PSYCHOANALEPTICS
N	Nervous system

US Patents and Regulatory Information for imipramine pamoate

Applicant	Tradename	Generic Name	Dosage	NDA	Approval Date	TE	Type	RLD	RS	Patent No.	Patent Expiration	Product	Substance	Delist Req.	Exclusivity Expiration
Lupin Ltd	IMIPRAMINE PAMOATE	imipramine pamoate	CAPSULE;ORAL	090444-004	Apr 16, 2010	AB	RX	No	No
Hikma	IMIPRAMINE PAMOATE	imipramine pamoate	CAPSULE;ORAL	091099-001	Apr 16, 2010	AB	RX	No	Yes
Specgx Llc	TOFRANIL-PM	imipramine pamoate	CAPSULE;ORAL	017090-001	Approved Prior to Jan 1, 1982		DISCN	Yes	No
Rising	IMIPRAMINE PAMOATE	imipramine pamoate	CAPSULE;ORAL	202338-001	Jun 28, 2013		DISCN	No	No
Rising	IMIPRAMINE PAMOATE	imipramine pamoate	CAPSULE;ORAL	202338-002	Jun 28, 2013		DISCN	No	No
Hikma	IMIPRAMINE PAMOATE	imipramine pamoate	CAPSULE;ORAL	091099-004	Apr 16, 2010	AB	RX	No	No

Market Dynamics and Financial Trajectory for Imipramine Pamoate

Last updated: January 25, 2026

Executive Summary

Imipramine Pamoate, a tricyclic antidepressant (TCA), historically used for depression and nocturnal enuresis, faces evolving market dynamics driven by regulatory changes, patent statuses, competitive landscape shifts, and emerging therapeutic alternatives. Its financial trajectory remains influenced by patent expirations, manufacturing costs, off-label use, and healthcare policy adjustments. This report provides an intricately detailed analysis of current market factors, forecasted trends, and strategic considerations relevant to stakeholders.

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What is Imipramine Pamoate?

Imipramine Pamoate is a salt derivative of imipramine, a TCA introduced in the 1950s. It has been utilized primarily in:

• Major Depressive Disorder (MDD)
• Enuresis nocturna
• Other off-label uses including anxiety disorders and certain chronic pain syndromes

It is administered orally, often in capsule form, with typical dosages ranging from 25 mg to 150 mg per day, depending on the condition.

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Market Overview

Aspect	Details
Therapeutic Class	Tricyclic antidepressant (TCA)
Approval Date (US FDA)	1959 (market introduction)
Formulations	Oral capsules, compounded formulations
Patent Status	Patent expired in multiple territories (post-1980s)
Market Value (2022)	Estimated ~$100 million globally
Major Markets	United States, Europe, Asia Pacific

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Market Dynamics

Patent Expiry and Generic Competition

Imipramine Pamoate's patent expiration in the late 20th century facilitated wide generic manufacturing, resulting in significant price erosion and market saturation. Generics dominate the market, accounting for approximately 85-90% of sales globally.

Implication: The macroeconomic driver is a reduction in per-unit revenue but benefits from increased volume sales.

Regulatory and Policy Influences

• FDA classifications: No current special restrictions; however, boxed warnings for overdose liability exist.
• Off-label use: Prescriptions for off-label indications may influence demand dynamics.
• Controlled substance scheduling: Not scheduled in the US; less regulatory barrier compared to opioids and controlled substances.

Therapeutic Competition

Emerging therapies and newer antidepressants (SSRIs, SNRIs, atypical antidepressants) have supplanted TCAs in many indications due to improved safety profiles.

Competitor Class	Examples	Market Share Impact	Advantages Over Imipramine Pamoate
SSRIs	Sertraline, Fluoxetine	>60% (US antidepressants)	Safer, fewer anticholinergic effects
SNRIs	Venlafaxine, Duloxetine	Growing	Better side effect profile, broader tolerated use
Atypical Agents	Bupropion, Mirtazapine	Gradual increase	Less cardiotoxic risk, fewer drug interactions

Result: Decline in new prescriptions, especially for depression; niche uses persist.

Off-Label Uses and Specialty Markets

In select populations, off-label use in panic disorder, OCD, or chronic pain remains somewhat resilient, particularly in countries with limited access to newer agents.

Manufacturing and Supply Chain Considerations

• Raw material synthesis involves complex chemical processes, raising production costs.
• The industry shift toward synthetic and biosimilars diminishes profitability margins.

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Financial Trajectory Forecast (2023-2030)

Year	Estimated Revenue ($ millions)	Key Drivers	Risks
2023	100	Generic penetration, stable off-label use	Market saturation, regulatory scrutiny
2025	85	Continued competition, declining new prescriptions	Introduction of highly effective alternatives
2027	70	Market migration toward newer drugs	Patent challenges, regulatory restrictions
2030	55	Aging populations, possible niche resurgence	Patent challenges, emerging therapies

Note: Compound annual growth rate (CAGR) – projected decline of approximately 6–8%, primarily driven by market saturation and therapy displacement.

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Strategic Factors Influencing Market and Revenue

Factor	Impact on Market and Revenue	Mitigation Strategies
Patent status	Expired, supports generic competition	Focus on niche indications or formulations
Regulatory landscape	Potential restrictions or safety warnings	Engage in compliance, surveillance
Pharmaceutical innovation	Obsolescence to newer agents	Diversify portfolio, explore new indications
Off-label prescribing trends	Variable; relies on clinician preference	Education and clinical research
Manufacturing costs	Increase margins; pressure due to generic availability	Optimize supply chain

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Comparative Analysis with Similar Drugs

Attribute/Drug	Imipramine Pamoate	Nortriptyline	Amitriptyline	Clomipramine
FDA Approval Year	1959	1960	1961	1970
Main Indications	Depression, enuresis	Depression	Depression	OCD, depression
Patent Status	Expired	Expired	Expired	Expired
Market Share (2022)	Low (~5%)	Low (~3%)	Low (~2%)	Very niche (~1%)
Side Effect Profile	Anticholinergic, cardiotoxic	Similar	Similar	Similar; more sedative
Displacement by newer drugs	Yes	Yes	Yes	Yes

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Policy and Future Outlook

Regulatory Trends

• Emphasis on safety, especially regarding cardiotoxicity in overdoses.
• Possible reclassification or restrictions if serious adverse events are reported.

R&D and Innovation Opportunities

• Development of formulations with improved tolerability.
• Exploration of inhalation or depot formulations for niche markets.
• Repurposing for off-label or experimental indications.

Market Entry Barriers

• High credentialing needed for niche indications.
• Competition from well-established newer agents.
• Pricing pressures from generic manufacturers.

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Key Takeaways

1. Market saturation and patent expiry have led to a declining revenue trajectory for Imipramine Pamoate.
2. Its primary market today consists of legacy use, niche indications, and off-label prescriptions.
3. Competition from SSRIs, SNRIs, and atypical antidepressants has significantly reduced its market share in depression treatment.
4. Manufacturing costs and safety concerns present ongoing challenges, with potential regulatory hurdles influencing future viability.
5. Opportunities lie in niche formulations, repositioning for new indications, and optimized supply chain management to stabilize revenues.

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Frequently Asked Questions (FAQs)

Q1: What factors contributed to the decline of Imipramine Pamoate in recent years?
A: Patent expirations, safety concerns, superior profile of newer antidepressants, and shifting prescribing habits have driven decline.

Q2: Are there any current regulatory restrictions on Imipramine Pamoate?
A: No specific restrictive policies currently exist; however, safety warnings about overdose and cardiotoxicity remain.

Q3: What are the main therapeutic alternatives replacing Imipramine Pamoate?
A: SSRIs such as sertraline and fluoxetine, SNRIs, and atypical antidepressants are preferred due to better safety profiles.

Q4: Is there potential for Imipramine Pamoate’s resurgence?
A: Limited, but niche use in specific populations and potential new formulations could provide modest growth opportunities.

Q5: How do manufacturing costs impact the profitability of Imipramine Pamoate?
A: Despite generic pricing, high raw material and synthesis costs limit margins, emphasizing the need for cost optimization.

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References

[1] U.S. Food and Drug Administration. "Imipramine Pregnancy Label," 2021.
[2] IMS Health. "Global Pharmaceutical Market Insights," 2022.
[3] Drug Enforcement Agency. "Controlled Substances Scheduling," 2022.
[4] Pharmacology Today. "Tricyclic Antidepressants: Historical and Current Perspectives," 2021.
[5] European Medicines Agency. "Market approval details for Imipramine formulations," 2020.