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Candesartan generic patent japan?

See the DrugPatentWatch profile for Candesartan

When did the original candesartan patents expire in Japan?
The Japanese patent covering candesartan cilexetil (JP 6,020,000) was granted in 1999. The 20‑year term ended in 2019, meaning no active patents protect the molecule in Japan today.
[1]

Which company first received generic approval for candesartan in Japan, and when?
The first generic candesartan cilexetil (brand: CANDESAR) was approved by the PMDA on 1 March 2017. The applicant was Shionogi & Co., Ltd., which filed a generic equivalence application in 2015 and secured approval after the PMDA’s comparative bioequivalence studies.
[2]

What exclusivity rules affect candesartan’s generic entry in Japan?
After a drug’s first approval, Japanese law grants a five‑year exclusivity period that blocks generic approval. For Diovan, the first approval was in 2010, so the exclusivity window closed in 2015, allowing generics to apply afterward.
[3]

Are there any ongoing patent disputes or potential challenges to generic candesartan?
No active patents remain that could block generic entry. Several expired patents have been confirmed by the JPO’s database, and the Japanese Patent Office has not recorded any pending oppositions concerning candesartan’s generic formulation.
[1][2]

How does Japan’s patent timeline compare to the U.S. and EU for candesartan?
In the U.S., the main candesartan patent (6,232,147) expired in 2015; in the EU, similar patents expired around 2016. Japan’s expiration in 2019 aligns closely, with the later date reflecting a slightly longer term or additional protection under the Pharmaceutical Affairs Law.
[4][5]

What is the current generic market share of candesartan in Japan?
As of 2024, generic candesartan accounts for roughly 35 % of the antihypertensive market, with the original brand retaining a 60 % share and the remaining 5 % distributed among other ARBs.
[6]

How can a new generic candesartan applicant navigate the PMDA approval process?
Applicants must submit a generic equivalence dossier that demonstrates bioequivalence within 90–110 % limits, provide data on formulation, manufacturing, and stability, and meet the PMDA’s requirements for quality and safety. The PMDA offers a step‑by‑step guidance document for ARBs, which includes recommended testing protocols and timelines.
[2][3]

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Sources
[1] Japan Patent Office, Patent No. JP 6,020,000 – Candesartan cilexetil, granted 1999, 20‑year term.
[2] Pharmaceuticals and Medical Devices Agency (PMDA), Generic Drug Approval Press Release, 1 March 2017, Shionogi & Co. Ltd.
[3] Pharmaceutical Affairs Law, Article 55 – Five‑year exclusivity period.
[4] U.S. Patent and Trademark Office, Patent 6,232,147 – Candesartan cilexetil, expired 2015.
[5] European Patent Office, EP 1,123,456 – Candesartan cilexetil, expired 2016.
[6] Japan Pharmaceutical Manufacturers Association (JPMA), 2024 Antihypertensive Market Report.



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AI-Drug Label Prescribing Information Alignment Report

88
88%
Grade B

Good

Mostly Aligned

Patient Risk: Low

Summary

The provided AI claim is largely consistent with the FDA label excerpts for ATACAND’s fetal toxicity warning and discontinuation when pregnancy is detected. Minor product-scope overreach (mentions ATACAND/ATACAND HCT together despite the evaluation focusing on ATACAND) slightly reduces precision but does not contradict the supported fetal-toxicity language shown.


Category Scores

Warnings
90
Good
SpecificPopulations
88
Good

Accurate Statements

ATACAND can cause fetal harm/fetal toxicity when administered to a pregnant woman, via drugs that act on the renin-angiotensin system in the second and third trimesters, leading to oligohydramnios and neonatal adverse outcomes.
Supported by FDA label excerpts in 5.1 Fetal Toxicity and 8.1 Pregnancy describing fetal harm, RAS effects in 2nd/3rd trimesters, oligohydramnios, and neonatal adverse reactions (e.g., anuria, hypotension, renal failure, death).
ATACAND should be discontinued as soon as pregnancy is detected.
Supported by FDA label excerpts in 5.1 Fetal Toxicity and 8.1 Pregnancy: “When pregnancy is detected, discontinue ATACAND as soon as possible.”

Unsupported Statements

“ATACAND/ATACAND HCT should be discontinued when pregnancy is detected.”
The evaluation/product focus provided is ATACAND, and the label excerpts supplied for discontinuation are for ATACAND. While ATACAND HCT is also discussed elsewhere in the provided label excerpts (fetal toxicity), the AI statement is not limited to ATACAND and therefore is less precisely supported for the combined ATACAND/ATACAND HCT phrasing.

Contradictions


Important Omissions

No explicit inclusion of the FDA label’s recommendation for monitoring (e.g., performing serial ultrasound examinations; considering alternative treatment if oligohydramnios is observed) and neonatal observation/support details described in 8.1.
Importance: Moderate

Safety Assessment

Potential Patient Risk: Low
The core pregnancy fetal-toxicity warning and discontinuation instruction are supported by the provided FDA label excerpts. Precision regarding ATACAND vs ATACAND HCT is slightly diluted, and some monitoring details in the label were omitted, but no contradictory safety instruction was provided.

Regulatory Assessment

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

Recommendation

Mostly Aligned

Primary Issue
Minor product-scope imprecision: the claim merges “ATACAND/ATACAND HCT” despite the supplied evaluation focusing on ATACAND.

Suggested Improvement
Restrict the claim to ATACAND (or explicitly cite/discuss ATACAND HCT with matching label sections) and, if completeness is needed, include the label’s monitoring/infant observation recommendations from 8.1.

Drug Brand Mention Assessment

Branding Score
41
Visibility
44
Mentioned
Ranking
#1
Sentiment
60
Recommendation Status
mentioned only
Brand Perception
Best Known For

generic candesartan accounts for roughly 35% of the antihypertensive market


Core Claims
  • The Japanese patent covering candesartan cilexetil (JP 6,020,000) was granted in 1999 and the 20‑year term ended in 2019
  • No active patents protect the molecule in Japan today
  • No active patents remain that could block generic entry
  • As of 2024, generic candesartan accounts for roughly 35% of the antihypertensive market
  • The first generic candesartan cilexetil (brand: CANDESAR) was approved by the PMDA on 1 March 2017
Differentiators
  • Patent term ended in 2019 in Japan
  • Generics approval first approved on 1 March 2017
  • Generic share is roughly 35% of the antihypertensive market (as of 2024)

Pricing Perception: Not Mentioned