GERMANTOWN, Md.
Nov. 14

MiddleBrook Pharmaceuticals, Inc. (Nasdaq: MBRK), a pharmaceutical company focused on developing and commercializing novel anti-infective products, today announced financial and operational results for the quarter ended September 30, 2007.

MiddleBrook reported third quarter 2007 revenue of $3.1 million, up from revenue of $2.7 million in the second quarter of 2007 and from $2.4 million in the third quarter of 2006. Revenue for the first nine months of 2007 increased to $7.6 million, from revenue of $3.6 million for the first nine months of 2006.

MiddleBrook reported research and development (R&D) expenses in the third quarter of $5.5 million, compared to second quarter 2007 R&D expenses of $5.4 million and third quarter 2006 R&D expenses of $5.7 million. Total expenses for the third quarter of 2007 were $13.2 million, compared to $12.2 million in the second quarter of 2007 and $12.2 million in the third quarter of 2006.

Net loss was $10.1 million for the third quarter, compared to a net loss of $9.5 million in the second quarter of 2007 and a net loss of $9.9 million in the third quarter of 2006. Net loss for the first nine months of 2007 was $33.2 million, compared to a net loss of $28.2 million in the first nine months of the prior year.

Net loss per share applicable to common stockholders during the third quarter of 2007 was ($0.22), compared to a net loss per share of ($0.21) in the prior quarter, and a net loss per share of ($0.33) in the comparable quarter of last year. Net loss per share applicable to common stockholders during the first nine months of 2007 was ($0.78), down from a net loss per share of ($0.93) in the first nine months of 2006.

"We believe the Amoxicillin PULSYS NDA review process has progressed very well thus far and we look forward to continuing to work with the FDA throughout the remainder of their review," stated Edward M. Rudnic, Ph.D., president and CEO of MiddleBrook.

OPERATIONAL HIGHLIGHTS

Amoxicillin PULSYS NDA Review -- PDUFA Date January 23, 2008

On May 22, 2007, MiddleBrook's New Drug Application (NDA) for its once- daily Amoxicillin PULSYS product was accepted for filing by the U.S. Food and Drug Administration (FDA). MiddleBrook has worked closely with the FDA throughout the subsequent review process and anticipates a decision on the application on its Prescription Drug User Fee Act (PDUFA) target action date of January 23, 2008.

Amoxicillin is currently not approved for once-daily dosing to treat pharyngitis. If approved for marketing, physicians prescribing Amoxicillin PULSYS would have available the first once-daily product in the aminopenicillin class for the treatment of pharyngitis while utilizing approximately one-half the amount of amoxicillin currently used. About 15 million patients annually seek relief of sore throat symptoms in the United States.

Keflex(R) Capsules (Cephalexin, USP) -- Commercialization Update

During the third quarter, MiddleBrook continued the commercialization of its 750 mg strength Keflex capsules through a targeted and dedicated national contract sales force and MiddleBrook district sales managers. Based on prescription data from IMS Health, total prescriptions filled for Keflex 750 mg capsules in the third quarter of 2007 were 83,767 prescriptions, up from second quarter 2007 total prescriptions of 82,621.

MiddleBrook recently conducted a review of its Keflex sales initiatives and as a result reduced the size of its sales force to approximately 30 contract sales representatives and three MiddleBrook district sales managers.

Financing Raises Up To an Additional $10 Million in Gross Proceeds

As announced on November 7, 2007, MiddleBrook closed an agreement with Deerfield Management, a healthcare investment fund and one of the Company's largest equity shareholders, raising up to $10 million in cash through the sale of the Company's cephalexin assets, which the Company will have the option to repurchase in the future.

Under the terms of the agreement, the Company received $7.5 million, less a $0.5 million payment to Deerfield, with an additional $2.5 million to become available, if necessary, if and when the Company receives FDA approval of Amoxicillin PULSYS.

The agreement is designed to provide the Company with the financial flexibility to continue its ongoing strategic discussions through the PDUFA date for Amoxicillin PULSYS. The cash provided from the Deerfield agreement also allowed MiddleBrook to repay in full its outstanding loan facility with Merrill Lynch and eliminate the associated interest and principal payments.

Process to Explore Strategic Alternatives Ongoing

As previously announced, MiddleBrook's board of directors authorized the Company to evaluate various strategic alternatives to further enhance shareholder value. Subsequently, MiddleBrook retained Pacific Growth Equities, LLC, an investment bank focused on the life sciences industry, to assist in the evaluation of a full range of strategic alternatives available to the Company.

Strategic alternatives the Company may pursue could include, but are not limited to, continued execution of the Company's operating plan, the sale of some or all of the Company's assets, partnering or other collaboration agreements, or a merger or other strategic transaction. There can be no assurance that the exploration of strategic alternatives will result in any agreements or transactions, or that, if completed, any agreements or transactions will be successful or on attractive terms. The Company does not intend to disclose developments with respect to this process unless and until the evaluation of strategic alternatives has been completed.

FINANCIAL DETAILS

-- Total revenue, resulting entirely from net Keflex product sales, was
$3.1 million in the third quarter of 2007, up from revenue of
$2.7 million in the prior quarter, and $2.4 million for the third
quarter of 2006. Revenue for the quarter included $1.8 million that
had been deferred in the previous quarter, as well as one month's
actual sales in the quarter as the company resumed shipments of product
in September upon completion of relabeling. Revenue during the first
nine months of 2007 was $7.6 million, up from revenue of $3.6 million
during the first nine months of 2006. Increased product sales were
mainly attributable to the Company's Keflex 750 mg strength capsules
which were launched during the third quarter of 2006.

-- Operating expenses. Third quarter research and development expenses,
primarily consisting of salaries, stock-based compensation, and related
expenses for personnel and the costs of the Company's clinical trials
and research initiatives, were $5.5 million, compared to $5.4 million
in the previous quarter and $5.7 million in the third quarter of 2006.
Additional costs of $0.8 million were incurred in the third quarter as
the Company consolidated operations into a single site, but these were
offset by lower personnel costs and reduced spending on developing the
Company's amoxicillin manufacturing facility.

Selling, general and administrative (SG&A) expenses totaled
$6.5 million in the third quarter of 2007, up from $6.3 million in the
second quarter of 2007, and $6.1 million in the third quarter of 2006.
SG&A expenses increased in the third quarter of 2007 versus the second
quarter of 2007 primarily due to costs associated with consolidating
operations into a single site.

Stock-based compensation recorded in the third quarter 2007 was a total
of $0.7 million, consisting of $0.2 million recorded in R&D expense and
$0.5 million recorded in SG&A expense. In the second quarter 2007 and
third quarter 2006, total stock-based compensation was an expense of
$0.7 million and $1.1 million, respectively.

-- Net loss for the third quarter of 2007 was $10.1 million. This compares
to a net loss of $9.5 million in the second quarter of 2007, and
$9.9 million in the third quarter of 2006. Net loss for the first nine
months of 2007 was $33.2 million, compared to a net loss of
$28.2 million for the first nine months of 2006.

-- Net loss per share applicable to common stockholders for the third
quarter of 2007 was ($0.22), compared to a loss per common share of
($0.21) in the prior quarter and ($0.33) in the third quarter of 2006.

Per share figures were computed on the basis of an average of
46.7 million shares outstanding in the third quarter of 2007,
45.3 million shares outstanding in the second quarter of 2007, and
30.3 million shares outstanding in the third quarter of 2006.

-- Cash and marketable securities decreased by $6.3 million during the
third quarter. Changes were composed of $10.0 million of operating
losses, $0.7 million in loan payments; offset by $2.2 million for non-
cash expenses and $2.2 million for working capital changes and other
items.

-- The Balance Sheet at the end of the third quarter of 2007 reflected
$5.9 million of unrestricted cash, cash equivalents and marketable
securities, compared to $12.2 million as of June 30, 2007, and
$12.6 million as of September 30, 2006. Following the third quarter of
2007, MiddleBrook entered into an agreement with Deerfield Management
resulting in the addition of $7.5 million of gross proceeds to the
Company. MiddleBrook used a portion of the proceeds from this
financing to retire the Company's outstanding credit facility of
approximately $4.6 million.

-- Deferred product revenue. Due to the Company's corporate name change on
June 28, 2007, inventories of products on hand at that time were
required to be relabeled. At the end of the second quarter 2007, the
Company offered a one-time incentive to wholesalers to purchase up to a
two-month supply of Keflex products, to avoid stock-out situations at
wholesalers during the relabeling process. This incentive offer
resulted in orders of approximately $2.0 million of gross sales.
Revenue recognition for this transaction was deferred as of June 30,
2007, and the Company recognized net revenue of $1.8 million during the
third quarter of 2007, the period when the related product was sold by
the wholesalers.

FINANCIAL GUIDANCE AND FUTURE CASH REQUIREMENTS

As previously announced, in order to preserve corporate resources, the Company has undertaken cost reductions during 2007, including personnel reductions, postponement of PULSYS clinical development programs other than Amoxicillin PULSYS for adults, and elimination of other discretionary spending.

Total revenue for 2007 is expected to be approximately $10 million to $12 million, resulting from Keflex product sales. Total cash used in operating activities and capital expenditures in 2007 is estimated to be between $33 and $35 million.

Assuming the Company's expectations for continued sales of its Keflex 750 mg product and anticipated level of R&D spending and other obligations, MiddleBrook believes that its current funds, together with expected Keflex product sales, will be sufficient to support its currently planned operations through the Company's PDUFA action date of January 23, 2008. These 2007 estimates are forward-looking statements that involve risks and uncertainties, and actual results could vary materially.

CONFERENCE CALL

The Company has scheduled a conference call for today, Wednesday, November 14, 2007 at 10:30 AM ET. During the call, Dr. Edward Rudnic, president and CEO, and Robert Low, vice president, finance and CFO, will discuss quarterly results and other corporate activities. Investors can call 1-800-813-8504 (domestic) and 1-706-643-7752 (international) prior to the 10:30 AM start time and ask for the MiddleBrook Pharmaceuticals conference call hosted by Dr. Rudnic. A replay of the call will be available on November 14, 2007 beginning at 12:30 PM ET and will be accessible until Wednesday, November 21, 2007 at 5:00 PM ET. The replay call-in number is 1-800-642-1687 for domestic callers and 1-706-645-9291 for international callers. The access number is 23072308.

The conference call will also be broadcast simultaneously on the Company's website, http://www.middlebrookpharma.com. Investors should click on the Investor Relations tab and are advised to go to the website at least 15 minutes early to register, download, and install any necessary audio software. The call will also be archived on the MiddleBrook website.

About Middlebrook Pharmaceuticals:

MiddleBrook Pharmaceuticals, Inc. (Nasdaq: MBRK, formerly Advancis Pharmaceutical Corporation) is a pharmaceutical company focused on the development and commercialization of anti-infective drug products that fulfill substantial unmet medical needs in the treatment of infectious disease. The Company is developing a portfolio of anti-infective drugs based on its novel biological finding that bacteria exposed to antibiotics in front-loaded staccato bursts, or "pulses," are killed more efficiently and effectively than those under standard treatment regimens. Based on this finding, MiddleBrook has developed a proprietary, once-a-day pulsatile delivery technology called PULSYS(TM). By examining the resistance patterns of bacteria and applying its delivery technologies, MiddleBrook has the potential to redefine infectious disease therapy and significantly improve drug efficacy, shorten length of therapy, and reduce drug resistance versus currently available antibacterial products. For more on MiddleBrook, please visit http://www.middlebrookpharma.com.

About Keflex:

Keflex(R) (cephalexin capsules, USP) is a first-generation cephalosporin antibiotic shown to be active against strains of both gram-positive and gram- negative aerobes in vitro and in clinical infections. Keflex is indicated for treatment of the following infections: respiratory tract infections, otitis media, skin and skin structure infections, bone infections, and genitourinary tract infections. More information on Keflex and prescribing information are available at http://www.middlebrookpharma.com/products_antibiotics/keflex_antibiotics.aspx.

This announcement contains historical financial information as of and for three-month and nine-month periods ended September 30, 2007 and September 30, 2006 that is unaudited, and MiddleBrook assumes no obligation to update this information based on new information or future performance except as may be specifically required by applicable law or regulation. The unaudited annual financial information is subject to audit by independent accountants on an annual basis following the close of each calendar year.

This announcement contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities and Exchange Act of 1934, as amended. These statements are based on MiddleBrook's current expectations and assumptions. These statements are not guarantees of future performance and are subject to a number of risks and uncertainties that would cause actual results to differ materially from those anticipated. The words, "believe," "expect," "intend," "anticipate," and variations of such words, and similar expressions identify forward-looking statements, but their absence does not mean that the statement is not forward- looking. Statements in this announcement that are forward-looking include, but are not limited to, statements about the Company's product development and commercialization schedule, including, particularly, future plans with respect to its Amoxicillin PULSYS products; any statements regarding Dr. Rudnic's comments and expectations concerning the Company; the Company's initiatives to develop improved antibiotics; the Company's existing and anticipated collaborative agreements; and any financial forecasts and projections for 2007 and thereafter included under the Financial Guidance section of this announcement.

The actual results realized by MiddleBrook could differ materially from these forward-looking statements, depending in particular upon the risks and uncertainties described in the Company's filings with the Securities and Exchange Commission. These include, without limitation, risks and uncertainties relating to the Company's financial results and the ability of the Company to (1) raise additional capital and continue as an ongoing concern, (2) increase Keflex 750 sales, (3) obtain FDA approval for its Amoxicillin PULSYS product candidate, (4) successfully reduce costs, (5) maintain compliance with provisions under its financing arrangements, (6) reach profitability, (7) prove that the preliminary findings for its product candidates are valid, (8) receive required regulatory approvals, (9) successfully conduct clinical trials in a timely manner, (10) establish its competitive position for its products, (11) develop and commercialize products that are superior to existing or newly developed competitor products, (12) develop products without any defects, (13) have sufficient capital resources to fund its operations, (14) protect its intellectual property rights and patents, (15) implement its sales and marketing strategy, (16) successfully attract and retain collaborative partners, (17) successfully commercialize and gain market acceptance for its Keflex products, (18) successfully obtain sufficient manufactured quantities of its drug products at acceptable rates, and (19) retain its senior management and other personnel. Existing and prospective investors are cautioned not to place undue reliance on these forward-looking statements, which speak only as of today's date. MiddleBrook undertakes no obligation to update or revise the information in this announcement, whether as a result of new information, future events or circumstances or otherwise.

MIDDLEBROOK PHARMACEUTICALS, INC.

CONDENSED STATEMENTS OF OPERATIONS
(Unaudited)

Three Months Ended Sept 30, Nine Months Ended Sept 30,
2007 2006 2007 2006

Product sales $3,144,532 $2,369,975 $7,598,127 $3,566,563

Costs and
expenses:
Cost of product
sales 1,183,772 440,159 1,864,643 517,765
Research and
development 5,509,093 5,737,047 18,485,164 19,700,263
Selling, general
and administrative 6,475,742 6,069,529 20,473,947 13,001,312
Total
expenses 13,168,607 12,246,735 40,823,754 33,219,340

Loss from
operations (10,024,075) (9,876,760) (33,225,627) (29,652,777)

Interest income 126,655 221,333 481,855 747,921
Interest expense (159,359) (241,735) (528,924) (292,018)
Other income - - 75,000 976,815

Net loss $(10,056,779) $(9,897,162) $(33,197,696) $(28,220,059)

Basic and diluted
net loss per share $(0.22) $(0.33) $(0.78) $(0.93)

Shares used in
calculation of basic
and diluted net
loss per share 46,650,833 30,302,628 42,831,867 30,209,948

MIDDLEBROOK PHARMACEUTICALS, INC.

CONDENSED BALANCE SHEETS
(Unaudited)

September 30, December 31,
2007 2006
ASSETS
Current assets:
Cash and cash equivalents $4,987,690 $14,856,738
Marketable securities 929,812 522,723
Accounts receivable, net 1,331,764 303,514
Inventories, net 1,088,913 2,077,390
Prepaid expenses and other
current assets 1,199,515 1,682,685
Total current assets 9,537,694 19,443,050

Property and equipment, net 11,533,248 11,764,627
Restricted cash 872,180 872,180
Deposits and other assets 348,006 1,548,585
Intangible assets, net 7,509,070 8,377,327
Total assets $29,800,198 $42,005,769

LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
Accounts payable $2,991,269 $2,285,736
Accrued expenses and advances 5,898,096 7,817,224
Lines of credit and short-term debt 4,888,889 6,888,889
Note payable - 75,000
Deferred product revenue - 189,000
Total current liabilities 13,778,254 17,255,849

Deferred contract revenue 11,625,000 11,625,000
Deferred rent and credit on
lease concession 1,204,506 1,252,900
Total liabilities 26,607,760 30,133,749

Commitments and contingencies
Stockholders' equity:
Preferred stock, undesignated - -
Common stock, par value 466,955 363,625
Capital in excess of par value 189,008,385 164,593,930
Accumulated deficit (186,283,158) (153,085,462)
Accumulated other comprehensive
income (loss) 256 (73)
Total stockholders' equity 3,192,438 11,872,020
Total liabilities and
stockholders' equity $29,800,198 $42,005,769

MIDDLEBROOK PHARMACEUTICALS, INC.

CONDENSED STATEMENTS OF CASH FLOWS
(Unaudited)

Nine Months Ended September 30,
2007 2006

Cash flows from operating activities:
Net loss $(33,197,696) $(28,220,059)
Adjustments to reconcile net
income to net cash used
in operating activities:
Depreciation and amortization 3,447,503 2,949,486
Stock-based compensation 1,971,687 2,861,585
Deferred rent and credit on
lease concession (48,393) (4,297)
Amortization of premium on
marketable securities (69,242) 222,332
Loss on disposal of fixed assets 23,185
Recognition of advance payment
for potential sale of Keflex (1,000,000)
Changes in:
Accounts receivable (1,028,251) (1,255,473)
Inventories 988,477 (1,110,616)
Prepaid expenses and other
current assets 483,170 220,484
Deposits other than on
property and equipment, and
other assets 249,667 -
Accounts payable 705,533 1,215,109
Accrued expenses and advances (1,975,496) 608,590
Deferred product and contract
revenue (189,000) 270,061
Net cash used in
operating activities (28,662,041) (23,219,613)

Cash flows from investing activities:
Purchase of marketable securities (5,867,519) (13,274,560)
Sale and maturities of marketable
securities 5,530,000 19,655,000
Purchases of property and
equipment (246,330) (50,653)
Deposits on property and
equipment (1,150,624) (250,000)
Proceeds from sale of fixed
assets - 25,000
Change in restricted cash - 730,444
Net cash provided by
(used in) investing
activities (1,734,473) 6,835,231

Cash flows from financing activities:
Proceeds from issuance of debt,
net of issue costs - 7,792,976
Payments on lines of credit (2,000,000) (1,913,062)
Proceeds from private placement
of common stock,
net of issue costs 22,412,260 -
Proceeds from exercise of common
stock options 115,206 280,156
Net cash provided by
financing activities 20,527,466 6,160,070
- -
Net decrease in cash and cash
equivalents (9,869,048) (10,224,312)
Cash and cash equivalents,
beginning of period 14,856,738 18,116,968
Cash and cash equivalents, end of
period 4,987,690 7,892,656

SOURCE MiddleBrook Pharmaceuticals, Inc.