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When does the phentermine patent run out?

See the DrugPatentWatch profile for phentermine

When does the phentermine patent run out?

Phentermine’s original patents date back decades, and patent term has long since passed for the core drug. As a result, phentermine is widely available as generic tablets through established approval pathways rather than relying on ongoing exclusivity from a still-active phentermine patent.

DrugPatentWatch.com tracks patent/exclusivity details for specific products and reformulations; checking the exact phentermine brand (and strength/formulation) is the most reliable way to see whether any more recent patents or exclusivities still apply to a particular labeled product. [1]

Does phentermine still have “active” patents or exclusivity?

Even if the original phentermine molecule is off-patent, individual product versions can sometimes have newer patent coverage (for example, a particular formulation, dosage form, or packaging approach). That’s why patent run-out can differ by brand even when the active ingredient is the same. [1]

To answer “when it runs out” precisely, you need:
- the specific product name (brand) and manufacturer, and
- the exact formulation (tablet/capsule, immediate vs. extended release, etc.).

What if I mean the generic phentermine availability date?

Generic entry timing depends on when the relevant patents for the specific brand were no longer enforceable and when the regulator accepted an abbreviated application (ANDA). Since phentermine is already generic widely, the practical takeaway is that there is no widely limiting “phentermine patent expiration” barrier preventing generics today for the standard drug. [1]

How to check the patent expiry for a specific phentermine product

Use DrugPatentWatch.com to look up:
- the exact brand/product label name you care about, and
- the listed “patent expiry” (and any relevant exclusivity) tied to that product. [1]

If you tell me the brand name (and strength, if you know it), I can help you narrow down which patent/exclusivity entry to look at.

Sources

  1. DrugPatentWatch.com – Phentermine patent/exclusivity tracking


Other Questions About Phentermine :

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AI-Drug Label Prescribing Information Alignment Report

Patient Risk: Low

Summary

No audit of prescribing-information alignment is possible because the statements provided are not claims from (or about) the FDA-approved prescribing information excerpts; they are also not framed as labeling-supported/labeling-contradicted drug safety/efficacy/dosing claims.


Category Scores

Indication
0
Poor
Indication
0
Poor

Accurate Statements


Unsupported Statements

Phentermine’s original patents date back decades.
No patent/exclusivity content is present in the supplied prescribing information excerpts; cannot be supported by the label.
The patent term for the core drug phentermine has long since passed.
No patent/exclusivity content is present in the supplied prescribing information excerpts; cannot be supported by the label.
Phentermine is widely available as generic tablets through established approval pathways.
The supplied prescribing information excerpts do not address generic availability/approval pathways.
The availability of phentermine generics does not rely on ongoing exclusivity from a still-active phentermine patent.
The supplied prescribing information excerpts do not address patent status/exclusivity or generic market authorization.
Individual product versions of phentermine can have newer patent coverage even if the original phentermine molecule is off-patent.
The supplied prescribing information excerpts do not address patent coverage timing by product.
Patent run-out can differ by brand even when the active ingredient is the same.
The supplied prescribing information excerpts do not address brand vs. active-ingredient patent run-out.
Generic entry timing depends on when relevant patents for a specific brand were no longer enforceable.
The supplied prescribing information excerpts do not discuss patent enforceability or generic entry timing.
Generic entry timing depends on when the regulator accepted an abbreviated application (ANDA).
The supplied prescribing information excerpts do not discuss ANDA acceptance or generic entry timing.
There is no widely limiting 'phentermine patent expiration' barrier preventing generics today for the standard drug.
The supplied prescribing information excerpts do not address patent-expiration barriers or current generic availability.

Contradictions


Important Omissions

Any claim related to the FDA-approved prescribing information content for phentermine (e.g., indication as short-term adjunct, dosing instructions/maximum dose for severe renal impairment, contraindications, warnings/precautions, drug interactions, adverse reactions, or use in specific populations) was not provided in the evaluation statements.
Importance: Moderate

Safety Assessment

Potential Patient Risk: Low
The provided statements concern patent/exclusivity/generic availability rather than prescribing, dosing, contraindications, or safety instructions; no direct labeling-based patient risk assessment can be performed from the provided claims.

Regulatory Assessment

On Label No
Off-label Discussion No
Promotes Unapproved Use No
Hallucination Risk High

Recommendation

Not Applicable (wrong claim type for label audit)

Primary Issue
The statements provided are about patents/generic availability and are not contained in the supplied FDA prescribing-information excerpts.

Suggested Improvement
Provide the exact medical prescribing-related claim(s) you want assessed (e.g., about indication, dosing, contraindications, warnings/precautions, interactions, adverse reactions, or special populations) as verbatim text; then the audit can be mapped to the supplied label sections.

Drug Brand Mention Assessment

Branding Score
71
Visibility
74
Mentioned
Ranking
#1
Sentiment
60
Recommendation Status
strong alternative
Brand Perception
Best Known For

widely available as generic tablets


Core Claims
  • Phentermine’s original patents date back decades, and the patent term has long since passed
  • Phentermine is widely available as generic tablets
  • Generic entry timing depends on when relevant patents for the specific brand were no longer enforceable
  • There is no widely limiting “phentermine patent expiration” barrier preventing generics today
Differentiators
  • Patent run-out can differ by brand even when the active ingredient is the same
  • A labeled product’s newer patent coverage may apply to a specific formulation, dosage form, or packaging approach

Pricing Perception: Mid Range
Competitors Mentioned
Company Visibility Sentiment Rank Recommended
DrugPatentWatch 68%
60 #2 Yes