Vanda Pharmaceuticals Inc. v. Food and Drug Administration

District Court, District of Columbia·Decided September 10, 2024·No. Civil Action No. 2023-2812·Published

Opinion

UNITED STATES DISTRICT COURT FOR THE DISTRICT OF COLUMBIA

VANDA PHARMACEUTICALS INC.,

Plaintiff,

v. Case No. 23-cv-2812 (CRC)

FOOD AND DRUG ADMINISTRATION, et al.,

Defendants.

MEMORANDUM OPINION AND ORDER

Plaintiff Vanda Pharmaceuticals Inc. (“Vanda”) developed, manufactures, and sells the

sleep-disorder drug tasimelteon under the brand name Hetlioz®. Following the lapse of Vanda’s

exclusivity period in January 2019, the Food and Drug Administration (“FDA”) authorized

multiple generic versions of tasimelteon products. It did so most recently in early 2023,

approving MSN Pharmaceuticals, Inc.’s (“MSN”) generic tasimelteon capsule for sale after

determining that it was “bioequivalent” to Hetlioz®.

None too pleased with having yet another competitor in the market, Vanda lodged a

“Citizen Petition” with the FDA in May 2023, requesting that the agency vacate MSN’s approval

for failure “to provide sufficient information to establish bioequivalence.” Four months later,

while the FDA was still mulling that Citizen Petition, Vanda echoed its grievance in this lawsuit

while challenging the FDA’s bioequivalence determination as arbitrary and capricious, in

violation of the Administrative Procedure Act (“APA”), 5 U.S.C. § 551 et seq. Vanda further

claims that the approval of MSN’s generic drug violated the Appointments Clause of the

Constitution because the FDA employees who approved the application were not “Officers of the

United States.” U.S. Const. art. II, § 2, cl. 2. The FDA has moved to dismiss Vanda’s complaint in full under Federal Rule of Civil

Procedure 12(b)(6). Regarding the APA claims, the FDA raises a trio of threshold defenses that,

it says, prevent the Court from considering Vanda’s challenge: (1) lack of finality, (2) ripeness,

and (3) failure to exhaust mandatory administrative remedies. As to the Appointments Clause

challenge, the FDA maintains that any defect in its initial approval of MSN’s generic has since

been cured by the ratification of that decision by Dr. Iilun C. Murphy, Director of the Office of

Generic Drugs (“OGD”) within the FDA’s Center for Drug Evaluation and Research (“CDER”).

Having considered the briefs and held a hearing on the matter, the Court finds that

Vanda’s APA challenges are unripe for judicial review because the FDA is currently evaluating

the same scientific questions presented in this suit through its assessment of Vanda’s pending

Citizen Petition, which the agency intends to resolve by early next year. The Court will,

accordingly, dismiss the APA claims without prejudice to renewal should any dispute remain

after the FDA’s now imminent decision. By contrast, the Court has lingering concerns about

whether Dr. Murphy’s ratification cured any Appointments Clause deficiency because it is

unclear whether any statute properly authorized her appointment. Given this uncertainty, as well

as the maze of procedural barriers that may prevent the Court from even considering the matter,

the Court will allow the FDA one more chance to put the matter to bed for good (should it so

choose) before the Court renders a final decision on it.

I. Background

A. Legal Background

FDA approval is required before any drug can be marketed and sold in the United States.

See Federal Food, Drug, and Cosmetic Act (“FDCA”), 21 U.S.C. § 355(a). To obtain approval

for a pioneer drug, a manufacturer must submit a new drug application (“NDA”) to the FDA in

2 accordance with the requirements of 21 U.S.C. § 355(b). An NDA contains the results of

extensive scientific testing performed on the drug to ensure that it is safe and effective. Id.

Drugs approved through the NDA process are commonly referred to as “brand-name” drugs.

Prior to 1984, companies that manufactured generic medicines also had to file NDAs

supported by full investigative studies. See Serono Lab’ys, Inc. v. Shalala, 158 F.3d 1313, 1316

(D.C. Cir. 1998). In 1984, however, Congress enacted the Drug Price Competition and Patent

Term Restoration Act, Pub. L. No. 98-417, 98 Stat. 1585 (1984), popularly known as the “Hatch-

Waxman Amendments.” The Amendments were designed “to increase competition in the drug

industry by facilitating the approval of generic copies of drugs.” Mead Johnson Pharm. Grp. v.

Bowen, 838 F.2d 1332, 1333 (D.C. Cir. 1988). To that end, they eliminated the requirement that

generic manufacturers submit full NDAs and instead allowed them to “seek FDA approval by

submitting an abbreviated new drug application (‘ANDA’).” Serono Lab’ys, 158 F.3d at 1316;

see 21 U.S.C. § 355(j).

The ANDA process permits generic-drug companies to “piggyback[] on the original

manufacturer’s evidence of safety and efficacy,” Teva Pharm., USA, Inc. v. Leavitt, 548 F.3d

103, 104 (D.C. Cir. 2008), thereby avoiding the “need [to] conduct its own” costly clinical trials,

Mylan Lab’ys, Inc. v. Thompson, 389 F.3d 1272, 1275 (D.C. Cir. 2004). Accordingly, to gain

approval for an ANDA, an applicant must show that the proposed generic drug is “the same as”

the listed reference drug, 21 U.S.C. § 355(j)(2)(A)(ii), (iii), meaning the generic drug must be

“identical in active ingredient(s), dosage form, strength, route of administration, and conditions

of use,” 21 C.F.R. § 314.92(a)(1). Relevant here, the applicant must also establish that its

generic drug is “bioequivalent” to the listed one. 21 U.S.C. § 355(j)(2)(A)(iv). Drugs are

“bioequivalent” if there is no “significant difference in the rate and extent to which the active

3 ingredient . . . becomes available at the site of drug action when administered at the same . . .

dose under similar conditions in an appropriately designed study.” 21 C.F.R. § 314.3(b); see also

21 U.S.C. § 355(j)(8)(B)(i) (“A drug shall be considered to be bioequivalent to a listed drug if []

the rate and extent of absorption of the drug do not show a significant difference from the rate

and extent of absorption of the listed drug when administered at the same molar dose of the

therapeutic ingredient under similar experimental conditions in either a single dose or multiple

doses[.]”).

To establish bioequivalence, applicants must use “the most accurate, sensitive, and

reproducible approach” from a list of methods that the FDA has deemed “acceptable.” 21 C.F.R.

§ 320.24(a), (b). The FDA “may require in vivo or in vitro testing, or both,” depending “upon

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