Federal Register, Volume 64 Issue 89 (Monday, May 10, 1999)

[Federal Register Volume 64, Number 89 (Monday, May 10, 1999)]
[Notices]
[Pages 25047-25048]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 99-11585]


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DEPARTMENT OF HEALTH AND HUMAN SERVICES

Food and Drug Administration
[Docket No. 98E-0487]


Determination of Regulatory Review Period for Purposes of Patent 
Extension; Denavir^TM

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 Denavir^TM 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 which claims that human drug product.

ADDRESSES: Written comments and petitions should be directed to the 
Dockets Management Branch (HFA-305), Food and Drug Administration, 5630 
Fishers Lane, rm. 1061, Rockville, MD 20852.

FOR FURTHER INFORMATION CONTACT: Brian J. Malkin, Office of Health 
Affairs (HFY-20), Food and Drug Administration, 5600 Fishers Lane, 
Rockville, MD 20857, 301-827-6620.

SUPPLEMENTARY INFORMATION: The Drug Price Competition and Patent Term 
Restoration Act of 1984 (Pub. L. 98-417) and the Generic Animal Drug 
and Patent Term Restoration Act (Pub. L. 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

[[Page 25048]]

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 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 
Denavir^TM (Penciclovir). Denavir^TM is indicated 
for the treatment of recurrent herpes labialis (cold sores) in adults. 
Subsequent to this approval, the Patent and Trademark Office received a 
patent term restoration application for Denavir^TM (U.S. 
Patent No. 5,075,445) from Beecham Group p.l.c., and the Patent and 
Trademark Office requested FDA's assistance in determining this 
patent's eligibility for patent term restoration. In a letter dated 
September 28, 1998, FDA advised the Patent and Trademark Office that 
this human drug product had undergone a regulatory review period and 
that the approval of Denavir^TM 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 
Denavir^TM is 1,299 days. Of this time, 954 days occurred 
during the testing phase of the regulatory review period, 345 days 
occurred during the approval phase. These periods of time were derived 
from the following dates:
    1. The date an exemption under section 505 of the Federal Food, 
Drug, and Cosmetic Act (the act) (21 U.S.C. 355) became effective: 
March 7, 1993. The applicant claims March 5, 1993, as the date the 
investigational new drug application (IND) became effective. However, 
FDA records indicate that the IND effective date was March 7, 1993, 
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 of the act: October 16, 1995. 
FDA has verified the applicant's claim that the new drug application 
(NDA) for Denavir^TM (NDA 20-629) was initially submitted on 
October 16, 1995.
    3. The date the application was approved: September 24, 1996. FDA 
has verified the applicant's claim that NDA 20-629 was approved on 
September 24, 1996.
    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 640 days of 
patent term extension.
    Anyone with knowledge that any of the dates as published is 
incorrect may, on or before July 9, 1999, submit to the Dockets 
Management Branch (address above) written comments and ask for a 
redetermination. Furthermore, any interested person may petition FDA, 
on or before November 8, 1999, for a determination regarding whether 
the applicant for extension acted with due diligence during the 
regulatory review period. 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 (address above) in three copies (except that 
individuals may submit single copies) and 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: April 29, 1999.
Thomas J. McGinnis,
Deputy Associate Commissioner for Health Affairs.
[FR Doc. 99-11585 Filed 5-7-99; 8:45 am]
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