AcelRx Pharmaceuticals Reports Fourth Quarter and Full-Year 2012 Financial Results

1 AcelRx Pharmaceuticals Reports Fourth Quarter and Full-Year 2012 Financial Results

REDWOOD CITY, Calif., March 12, 2013 AcelRx Pharmaceuticals, Inc. (Nasdaq: ACRX), ( AcelRx ), a specialty pharmaceutical company

focused on the development and commercialization of innovative therapies for the treatment of acute and breakthrough pain, today reported financial results for the fourth quarter and year ended December 31, 2012, and provided a corporate

We made important strides in the advancement of our sublingual Sufentanil NanoTab PCA System for the management of moderate to

severe post-operative pain in 2012 and early 2013. We announced positive results from two completed Phase 3 clinical trials, and we expect the results from our third and final planned Phase 3 trial of the NanoTab System in the second quarter of

2013, stated Richard King, President and CEO of AcelRx. Mr. King added, In addition, in December 2012, we strengthened our balance sheet when we raised $48 million in gross proceeds, $44 million in net proceeds, through a public

offering of our common stock. These funds will provide the capital needed to submit an NDA for the NanoTab System, expected in the third quarter of 2013, and to continue with commercial preparations for launch of the product in the U.S.

Fourth Quarter and Full Year Financial Results

Net loss for the fourth quarter of 2012 was $10.5 million, or $0.41 per share, compared with a net loss of $6.4 million, or $0.33 per share, for the fourth quarter of 2011. Common shares used in

calculating basic and diluted earnings per share were 25,587,614 for the fourth quarter of 2012 compared to 19,567,778 common shares for the fourth quarter of 2011.

During the fourth quarter of 2012, AcelRx recognized revenue of $1.7 million, compared to $624,000 for the same period in the previous year, related to a research grant from the U.S. Army Medical Research

and Materiel Command, or USAMRMC, for development of its ARX-04 product candidate, a Sufentanil NanoTab for the

treatment of moderate-to-severe acute pain.

Research and development, or R&D, expenses for the quarter ended December 31, 2012

totaled $7.8 million, compared with $4.7 million for the fourth quarter of 2011. The increase was primarily due to advancement of our clinical programs for the Sufentanil NanoTab PCA System, AcelRx s lead product candidate for the treatment of

post-operative pain and ARX-04. General and administrative expenses were $1.9 million for the quarter ended December 31, 2012, compared with $1.7 million for the quarter ended December 31, 2011, an increase primarily from higher legal

costs related to intellectual property.

For the year ended December 31, 2012, AcelRx reported a net loss of $33.4 million, or $1.51 per

share, compared with a net loss of $20.1 million, or $1.16 per share, for the same period in 2011. Common shares used in calculating basic and diluted earnings per share were 22,124,637 for the year ended December 31, 2012 compared to

17,344,727 for the year ended December 31, 2011.

As of December 31, 2012, AcelRx had cash, cash equivalents and investments of

$59.8 million, compared to $35.8 million at December 31, 2011.

Review of Recent Accomplishments and Corporate Update

AcelRx anticipates that quarterly R&D expenses for both the first and second quarters of 2013 will be in line with, or modestly higher than the R&D expenses experienced in fourth quarter of 2012

as AcelRx conducts and completes the Phase 3 clinical trials and prepares an NDA for the NanoTab System, and completes the ARX-04 Phase 2 clinical study. The development of ARX-04 beyond Phase 2 is dependent on the identification of additional

funding from USAMRMC or other sources. Additionally, AcelRx anticipates modest increases in general and administrative expenses due to costs associated with commercial preparations for launch of the NanoTab System in the US, and as AcelRx expands

its corporate infrastructure to support development of its product candidates.

AcelRx believes its current cash, cash equivalents and

investments are sufficient to fund operations into the third quarter of 2014.

AcelRx will conduct a conference call and webcast today, March 12, at 4:30 p.m. Eastern time (1:30 p.m. Pacific time) to discuss its financial

results and program updates. To listen to the conference call, dial in approximately ten minutes before the scheduled call to

(800) 860-2442 for domestic callers, (866) 605-3852 for Canadian callers, or (412) 858-4600 for international callers. Those interested in listening to the conference call live via the

Internet may do so by visiting the Investors section of the company s website at www.acelrx.com and selecting the Webcast link for the Q4 2012 Financial results. A webcast replay will be available on the AcelRx website for 90 days

following the call by visiting the Investors section of the company s website at www.acelrx.com.

About AcelRx Pharmaceuticals,

AcelRx Pharmaceuticals, Inc. is a specialty pharmaceutical company focused on the development and commercialization of innovative

therapies for the treatment of acute and breakthrough pain. AcelRx s lead product candidate, the Sufentanil NanoTab PCA System, is designed to solve the problems associated with post-operative intravenous patient-controlled analgesia which has

been shown to cause harm to patients following surgery because of the side effects of morphine, the invasive IV route of delivery and the complexity of infusion pumps. The NanoTab System has successfully completed two of its three planned Phase 3

clinical trials and a New Drug Application submission is planned for the third quarter of 2013. AcelRx recently completed enrollment in a Phase 2 study for ARX-04, a sufentanil formulation for the treatment of moderate-to-severe acute pain, funded

through a grant from USAMRMC, and top-line results are expected in the second quarter of 2013. The company has two additional pain treatment product candidates, ARX-02 and ARX-03, which have completed Phase 2 clinical development. For additional

information about AcelRx s clinical programs please visit www.acelrx.com.

Forward Looking Statements

This press release contains forward-looking statements, including, but not limited to, statements related to the process and timing of anticipated future

clinical development of AcelRx Pharmaceuticals product candidates, including the release of the Sufentanil NanoTab PCA System top-line clinical trial data, the release and anticipated timing of additional NanoTab System clinical trial data,

the potential submission of an NDA for NanoTab System and the timing thereof, therapeutic and commercial potential of NanoTab System and the anticipated timing and therapeutic and commercial potential of other AcelRx Pharmaceuticals product

candidates. These forward-looking statements are based on AcelRx Pharmaceuticals current expectations and inherently involve significant risks and uncertainties. AcelRx Pharmaceuticals actual results and the timing of events could differ

materially from those anticipated in such forward-looking statements as a result of these risks and uncertainties, which include, without limitation, risks related to: the ability of AcelRx Pharmaceuticals to successfully complete the clinical

trials for the sufentanil NanoTab System, that fact that subsequent analyses of the top-line data may lead to different (including less favorable) interpretations of the results than the analyses conducted to date or may identify important

implications of the study that are not reflected in these statements, or be subject to differing interpretations by the regulatory agencies; the success, cost and timing of all product development activities and clinical trials; the uncertain

clinical development process, including the risk that clinical trials, have an effective design, enroll a sufficient number of patients, or be completed on schedule, if at all; any delays or inability to obtain and maintain regulatory approval of

its product candidates in the United States and Europe; its ability to obtain adequate clinical supplies of the drug and device components of its product candidates; its ability to attract funding partners or collaborators with development,

regulatory and commercialization expertise; its ability to obtain sufficient financing to complete registration of its product candidates in the United States and Europe; the market potential for its product candidates; the accuracy of AcelRx

Pharmaceuticals estimates regarding expenses, capital requirements and needs for financing; and other risks detailed in the Risk Factors and elsewhere in AcelRx Pharmaceuticals U.S. Securities and Exchange Commission filings

and reports, including its Annual Report on Form 10-K filed with the SEC on March 12, 2013. AcelRx Pharmaceuticals undertakes no duty or obligation to update any forward-looking statements contained in this release as a result of new

information, future events or changes in its expectations.

Chief Financial Officer

SELECTED FINANCIAL DATA

(in thousands, except per share data)