Soleno Therapeutics (SLNO) 10-Q 2017 Q2 Quarterly report

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Soleno Therapetics, Inc. (formerly known as Capnia, Inc.) (the “Company”) on Form 10-Q for the fiscal quarter ended June 30, 2017, as filed with the Securities and Exchange Commission (the “Report”), Anish Bhatnagar, President, Chief Executive Officer of the Company, and David D. O’Toole, Chief Financial Officer of the Company, respectively, do each hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

• The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

• The information in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: August 11, 2017

/s/ Anish Bhatnagar

Anish Bhatnagar

President, Chief Executive Officer

(principal executive officer)

/s/ David D. O’Toole

David D. O’Toole

Senior Vice President, Chief Financial Officer

(principal financial and accounting officer)