Food and Drug Administration, HHS.
The Food and Drug Administration (FDA or Agency) has determined that PARAFON FORTE DSC (chlorzoxazone) tablets, 500 milligrams (mg), were not withdrawn from sale for reasons of safety or effectiveness. This determination means that FDA will not begin procedures to withdraw approval of abbreviated new drug applications (ANDAs) that refer to this drug product, and this determination will allow FDA to continue to approve ANDAs for chlorzoxane tablets, 500 mg, if all other legal and regulatory requirements are met.
Start Further Info
FOR FURTHER INFORMATION CONTACT:
David Faranda, Center for Drug Evaluation and Research, Food and Drug Administration, 10903 New Hampshire Ave., Bldg. 51, Rm. 6213, Silver Spring, MD 20993-0002, 301-796-8767.
End Further Info
Start Supplemental Information
In 1984, Congress enacted the Drug Price Competition and Patent Term Restoration Act of 1984 (Pub. L. 98-417) (the 1984 amendments), which authorized the approval of duplicate versions of drug products under an ANDA procedure. ANDA applicants must, with certain exceptions, show that the drug for which they are seeking approval contains the same active ingredient in the same strength and dosage form as the “listed drug,” which is a version of the drug that was previously approved. ANDA applicants do not have to repeat the extensive clinical testing otherwise necessary to gain approval of a new drug application (NDA).
The 1984 amendments include what is now section 505(j)(7) of the Federal Food, Drug, and Cosmetic Act (21 U.S.C. 355(j)(7)), which requires FDA to publish a list of all approved drugs. FDA publishes this list as part of the “Approved Drug Products With Therapeutic Equivalence Evaluations,” which is known generally as the “Orange Book.” Under FDA regulations, drugs are removed from the list if the Agency withdraws or suspends approval of the drug's NDA or ANDA for reasons of safety or effectiveness or if FDA determines that the listed drug was withdrawn from sale for reasons of safety or effectiveness (21 CFR 314.162).
A person may petition the Agency to determine, or the Agency may determine on its own initiative, whether a listed drug was withdrawn from sale for reasons of safety or effectiveness. This determination may be made at any time after the drug has been withdrawn from sale, but must be made prior to approving an ANDA that refers to the listed drug (§ 314.161 (21 CFR 314.161)). FDA may not approve an ANDA that does not refer to a listed drug.
PARAFON FORTE DSC (chlorzoxazone) tablets, 500 mg, is the subject of NDA 011529, held by Janssen Research & Development, LLC, and initially approved on August 15, 1958. PARAFON FORTE DSC is indicated as an adjunct to rest, physical therapy, and other measures for the relief of discomfort associated with acute, painful musculoskeletal conditions.
PARAFON FORTE DSC (chlorzoxazone) tablets, 500 mg, is listed in the “Discontinued Drug Product List” section of the Orange Book.
Flamingo Pharmaceuticals Ltd. submitted a citizen petition dated November 7, 2015 (Docket No. FDA-2015-P-4224), under 21 CFR 10.30, requesting that the Agency determine whether PARAFON FORTE DSC (chlorzoxazone) tablets, 500 mg, were withdrawn from sale for reasons of safety or effectiveness.
After considering the citizen petition and reviewing Agency records and based on the information we have at this time, FDA has determined under § 314.161 that PARAFON FORTE DSC (chlorzoxazone) tablets, 500 mg, were not withdrawn for reasons of safety or effectiveness. The petitioner has identified no data or other information suggesting that PARAFON FORTE DSC (chlorzoxazone) tablets, 500 mg, were withdrawn for reasons of safety or effectiveness. We have carefully reviewed our files for records concerning the withdrawal of PARAFON FORTE DSC (chlorzoxazone) tablets, 500 mg, from sale. We have also independently evaluated relevant literature and data for possible postmarketing adverse events. We have reviewed the available evidence and determined that this drug product was not withdrawn from sale for reasons of safety or effectiveness.
Accordingly, the Agency will continue to list PARAFON FORTE DSC (chlorzoxazone) tablets, 500 mg, in the “Discontinued Drug Product List” section of the Orange Book. The “Discontinued Drug Product List” delineates, among other items, drug products that have been discontinued from marketing for reasons other than safety or effectiveness. ANDAs that refer to PARAFON FORTE DSC (chlorzoxazone) tablets, 500 mg, may be approved by the Agency as long as they meet all other legal and regulatory requirements for the approval of ANDAs. If FDA determines that labeling for this drug product should be revised to meet current standards, the Agency will advise ANDA applicants to submit such labeling.
End Supplemental Information
Dated: July 8, 2016.
Associate Commissioner for Policy.
[FR Doc. 2016-16635 Filed 7-13-16; 8:45 am]
BILLING CODE 4164-01-P