[Federal Register Volume 67, Number 37 (Monday, February 25, 2002)]
[Notices]
[Pages 8546-8547]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 02-4382]


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DEPARTMENT OF HEALTH AND HUMAN SERVICES

Food and Drug Administration

[Docket No. 98E-1221]


Determination of Regulatory Review Period for Purposes of Patent 
Extension; Celexa

AGENCY: Food and Drug Administration, HHS.

ACTION: Notice.

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SUMMARY: The Food and Drug Administration (FDA) has determined the 
regulatory review period for Celexa and is publishing this notice of 
that determination as required by law. FDA has made the determination 
because of the submission of an application to the Commissioner of 
Patents and Trademarks, Department of Commerce, for the extension of a 
patent that claims that human drug product.

ADDRESSES: Submit written comments and petitions to the Dockets 
Management Branch (HFA-305), Food and Drug Administration, 5630 Fishers 
Lane, rm. 1061, Rockville, MD 20852. Submit electronic comments to 
http://www.fda.gov/dockets/ecomments.

FOR FURTHER INFORMATION CONTACT: Claudia V. Grillo, Office of 
Regulatory Policy (HFD-007), Food and Drug Administration, 5600 Fishers 
Lane, Rockville, MD 20857, 301-594-5645.

SUPPLEMENTARY INFORMATION: The Drug Price Competition and Patent Term 
Restoration Act of 1984 (Public Law 98-417) and the Generic Animal Drug 
and Patent Term Restoration Act (Public Law 100-670) generally provide 
that a patent may be extended for a period of up to 5 years so long as 
the patented item (human drug product, animal drug product, medical 
device, food additive, or color additive) was subject to regulatory 
review by FDA before the item was marketed. Under these acts, a 
product's regulatory review period forms the basis for determining the 
amount of extension an applicant may receive.
    A regulatory review period consists of two periods of time: A 
testing phase and an approval phase. For human drug products, the 
testing phase begins when the exemption to permit the clinical 
investigations of the drug becomes effective and runs until the 
approval phase begins. The approval phase starts with the initial 
submission of an application to market the human drug product and 
continues until FDA grants permission to market the drug product. 
Although only a portion of a regulatory review period may count toward 
the actual amount of extension that the Commissioner of Patents and 
Trademarks may award (for example, half the testing phase must be 
subtracted, as well as any time that may

[[Page 8547]]

have occurred before the patent was issued), FDA's determination of the 
length of a regulatory review period for a human drug product will 
include all of the testing phase and approval phase as specified in 35 
U.S.C. 156(g)(1)(B).
    FDA recently approved for marketing the human drug product Celexa 
(citalopram hydrobromide). Celexa is indicated for the treatment of 
depression. Subsequent to this approval, the Patent and Trademark 
Office received a patent term restoration application for Celexa (U.S. 
Patent No. 4,650,884) from H. Lundbeck A/S, and the Patent and 
Trademark Office requested FDA's assistance in determining this 
patent's eligibility for patent term restoration. In a letter dated 
December 19, 2000, FDA advised the Patent and Trademark Office that 
this human drug product had undergone a regulatory review period and 
that the approval of Celexa represented the first permitted commercial 
marketing or use of the product. Shortly thereafter, the Patent and 
Trademark Office requested that FDA determine the product's regulatory 
review period.
    FDA has determined that the applicable regulatory review period for 
Celexa is 5,498 days. Of this time, 5,061 days occurred during the 
testing phase of the regulatory review period, while 437 days occurred 
during the approval phase. These periods of time were derived from the 
following dates:
    1. The date an exemption under section 505(i) of the Federal Food, 
Drug, and Cosmetic Act (the act) (21 U.S.C. 355(i)) became effective: 
July 30, 1983. The applicant claims August 4, 1983, as the date the 
investigational new drug application (IND) became effective. However, 
FDA records indicate that the IND effective date was July 30, 1983, 
which was 30 days after FDA receipt of the IND.
    2. The date the application was initially submitted with respect to 
the human drug product under section 505(b) of the act: May 7, 1997. 
FDA has verified the applicant's claim that the new drug application 
(NDA) for Celexa (NDA 20-822) was initially submitted on May 7, 1997.
    3. The date the application was approved: July 17, 1998. FDA has 
verified the applicant's claim that NDA 20-822 was approved on July 17, 
1998.
    This determination of the regulatory review period establishes the 
maximum potential length of a patent extension. However, the U.S. 
Patent and Trademark Office applies several statutory limitations in 
its calculations of the actual period for patent extension. In its 
application for patent extension, this applicant seeks 1,826 days of 
patent term extension.
    Anyone with knowledge that any of the dates as published is 
incorrect may submit to the Dockets Management Branch (address above) 
written or electronic comments and ask for a redetermination by April 
26, 2002. Furthermore, any interested person may petition FDA for a 
determination regarding whether the applicant for extension acted with 
due diligence during the regulatory review period by August 26, 2002. 
To meet its burden, the petition must contain sufficient facts to merit 
an FDA investigation. (See H. Rept. 857, part 1, 98th Cong., 2d sess., 
pp. 41-42, 1984.) Petitions should be in the format specified in 21 CFR 
10.30.
    Comments and petitions should be submitted to the Dockets 
Management Branch. Three copies of any information are to be submitted, 
except that individuals may submit one copy. Comments are to be 
identified with the docket number found in brackets in the heading of 
this document. Comments and petitions may be seen in the Dockets 
Management Branch between 9 a.m. and 4 p.m., Monday through Friday.

    Dated: January 24, 2002.
Jane A. Axelrad,
Associate Director for Policy, Center for Drug Evaluation and Research.
[FR Doc. 02-4382 Filed 2-22-02; 8:45 am]
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