Condensed Interim Consolidated Financial Statements (Unaudited) Aeterna Zentaris Inc. As at

Condensed Interim Consolidated Financial Statements

Aeterna Zentaris Inc.

As at June 30, 2017 and for the three-month and six-month periods ended June 30, 2017 and 2016

(presented in thousands of US dollars)

Going concern (note 1)

Contingencies (note 14)

Subsequent events (note 15)

The accompanying notes are an integral part of these condensed interim consolidated financial statements.

Approved by the Board of Directors

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The accompanying notes are an integral part of these condensed interim consolidated financial statements.

The accompanying notes are an integral part of these condensed interim consolidated financial statements.

The accompanying notes are an integral part of these condensed interim consolidated financial statements.

1 Summary of business, going concern, and basis of preparation

Aeterna Zentaris Inc. ("Aeterna Zentaris" or the "Company") is a specialty biopharmaceutical company engaged in developing and commercializing novel pharmaceutical therapies.

These unaudited condensed interim consolidated financial statements have been prepared on a going concern basis, which assumes that the Company will be able to realize its assets and discharge its liabilities in the normal course of business. Since the Company's inception, the Company's operations have been financed through the sale of shares and warrants, revenue from license agreements and commissions, interest income on funds available for investment, government grants and tax credits and other non-dilutive financing sources. For the six months ended June 30, 2017, the Company did not generate any meaningful revenues from operations, and the Company has incurred significant operating losses and negative cash flows from operations since inception with an accumulated deficit of $304,105,000 as at June 30, 2017.

The ability of the Company to continue operating as a going concern is dependent upon raising additional financing through equity and non-dilutive sources of funding, including partnerships and licensing arrangements. There can be no assurance that the Company will have sufficient capital to fund its ongoing operations, or to develop or commercialize any products without future financings. The foregoing factors indicate the existence of a material uncertainty that may cast substantial doubt as to the Company's continued ability to meet its obligations as they come due and, accordingly, the appropriateness of the use of accounting principles applicable to a going concern. The Company is currently pursuing financing alternatives that may include equity, debt, and non-dilutive financing alternatives, including co-development through potential collaborations, strategic partnerships or other transactions with third parties. There can be no assurance that sufficient additional financing will be available on acceptable terms or at all. If the Company is unable to obtain additional financing when required, the Company may have to substantially reduce or eliminate planned expenditures or the Company may be unable to continue operations. The Company's ultimate success, its ability to raise additional financing, whether through equity, debt or other sources of funding and, consequently, to continue as a going concern, is also dependent upon the Company's MacrilenTM product being approved by the United States Food and Drug Administration ("FDA").

These unaudited condensed interim consolidated financial statements do not reflect the adjustments to the carrying values of assets and liabilities and the reported expenses and statement of financial position classifications that would be necessary if the Company were unable to realize its assets and discharge its liabilities as a going concern in the normal course of operations. Such adjustments could be material.

Basis of presentation

These unaudited condensed interim consolidated financial statements have been prepared in accordance with International Financial Reporting Standards ("IFRS") as issued by the International Accounting Standards Board ("IASB") applicable to the preparation of interim financial statements, including IAS 34, Interim Financial Reporting. These unaudited condensed interim consolidated financial statements should be read in conjunction with the Company's annual consolidated financial statements as at December 31, 2016 and December 31, 2015 and for the years ended December 31, 2016, 2015, and 2014, which have been prepared in accordance with IFRS, as issued by the IASB.

The accounting policies adopted in these consolidated financial statements are consistent with those of the previous financial year and previous quarter.

These unaudited condensed interim consolidated financial statements were approved by the Company's Board of Directors on August 10, 2017.

These unaudited condensed interim consolidated financial statements were prepared on a going concern basis (see going concern discussion above), under the historical cost convention, except for the warrant liability, which is measured at fair value.

2 Critical accounting estimates and judgments

The preparation of condensed interim consolidated financial statements in accordance with IFRS requires management to make judgments, estimates and assumptions that affect the reported amounts of the Company's assets, liabilities, revenues, expenses and related disclosures. Judgments, estimates and assumptions are based on historical experience, expectations, current trends and other factors that management believes to be relevant at the time at which the Company's condensed interim consolidated financial statements are prepared.

Management reviews, on a regular basis, the Company's accounting policies, assumptions, estimates and judgments in order to ensure that the condensed interim consolidated financial statements are presented fairly and in accordance with IFRS. Revisions to accounting estimates are recognized in the period in which the estimates are revised and in any future periods affected.

Critical accounting estimates and assumptions, as well as critical judgments used in applying accounting policies in the preparation of the Company's condensed interim consolidated financial statements, were the same as those found in note 3 to the Company's annual consolidated financial statements as at December 31, 2016 and 2015 and for the years ended December 31, 2016, 2015 and 2014.

3 Significant accounting policies and recent accounting pronouncements

Accounting policies used in the preparation of our condensed interim consolidated financial statements were the same as those found in note 2 to the Company's annual consolidated financial statements as at December 31, 2016 and 2015 and for the years ended December 31, 2016, 2015 and 2014.

Adopted without impact

In January 2016, the IASB issued amendments to IAS 12, Income taxes to clarify the requirements for recognizing deferred tax assets on unrealized losses. The amendments clarify the accounting for deferred tax where an asset is measured at fair value and that fair value is below the asset's tax base. They also clarify certain other aspects of accounting for deferred tax assets. The amendments are effective from January 1, 2017. The Company concluded that these amendments have no impact on the Company's consolidated financial statements.

In January 2016, the IASB issued an amendment to IAS 7, Statement of cash flows, introducing an additional disclosure that will enable users of financial statements to evaluate changes in liabilities arising from financing activities. The amendment is part of the IASB's Disclosure Initiative, which continues to explore how financial statement disclosure can be improved. The amendment is effective from January 1, 2017. The Company believes that the information provided in note 5 to these unaudited condensed interim consolidated financial statements is sufficient to meet this new requirement.

The final version of IFRS 9, Financial Instruments ("IFRS 9"), was issued by the IASB in July 2014 and will replace IAS 39, Financial Instruments: Recognition and Measurement ("IAS 39"). IFRS 9 introduces a model for classification and measurement, a single, forward-looking expected loss impairment model and a substantially reformed approach to hedge accounting. The new single, principle-based approach for determining the classification of financial assets is driven by cash flow characteristics and the business model in which an asset is held. The new model also results in a single impairment model being applied to all financial instruments, which will require more timely recognition of expected credit losses. It also includes changes in respect of an entity's own credit risk in measuring liabilities elected to be measured at fair value, so that gains caused by the deterioration of an entity's own credit risk on such liabilities are no longer recognized in profit or loss. IFRS 9, which is to be applied retrospectively, is effective for annual periods beginning on or after January 1, 2018 and is available for early adoption. In addition, an entity's own credit risk changes can be applied early in isolation without otherwise changing the accounting for financial instruments. There are amendments to IFRS 7 which require additional disclosures on transition from IAS 39 to IFRS 9. These amendments are effective upon adoption of IFRS 9. The Company is currently assessing the impact, if any, that these new standards may have on the Company's consolidated financial statements.

In May 2014, the IASB issued IFRS 15, Revenue from Contracts with Customers ("IFRS 15"). The objective of this new standard is to provide a single, comprehensive revenue recognition framework for all contracts with customers to improve comparability of financial statements of companies globally. This new standard contains principles that an entity will apply to determine the measurement of revenue and timing of when it is recognized. The underlying principle is that an entity will recognize revenue to depict the transfer of goods or services to customers at an amount that the entity expects to be entitled to receive in exchange for those goods or services. This new standard is effective for annual periods beginning on or after January 1, 2018, with early adoption permitted. The Company is currently assessing the impact, if any, that this new standard may have on the Company's consolidated financial statements.

In November 2016, the IFRS Interpretations Committee issued an Interpretation on how to determine the date of the transaction when applying IAS 21, The Effects of Changes in Foreign Exchange Rates. The Interpretation applies where an entity either pays or receives consideration in advance for foreign currency-denominated contracts. The Interpretation provides guidance for when a single payment/receipt is made, as well as for situations where multiple payments/receipts are made. The Interpretation is effective for annual periods beginning on or after January 1, 2018. The Company is currently assessing the impact, if any, that these amendments may have on the Company's consolidated financial statements.

In January 2016, the IASB issued IFRS 16, Leases ("IFRS 16"), which supersedes IAS 17, Leases, and the related interpretations on leases: IFRIC 4, Determining Whether an Arrangement Contains a Lease; Standard Interpretations Committee ("SIC") 15, Operating Leases - Incentives; and SIC 27, Evaluating the Substance of Transactions in the Legal Form of a Lease. IFRS 16 is effective for annual periods beginning on or after January 1, 2019, with earlier adoption permitted for companies that also apply IFRS 15. The Company is currently assessing the impact, if any, that this new standard may have on the Company's consolidated financial statements.

4 Payables and accrued liabilities

The change in the Company's warrant liability can be summarized as follows:

A summary of the activity related to the Company's share purchase warrants that are classified as a liability is provided below.

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The table presented below shows the inputs and assumptions applied to the Black-Scholes option pricing model in order to determine the fair value of all warrants outstanding as at June 30, 2017. The Black-Scholes option pricing model uses "Level 2" inputs, as defined by IFRS 13, Fair value measurement ("IFRS 13") and as discussed in note 11 - Financial instruments and financial risk management.

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6 Employee future benefits

The change in the Company's accrued benefit obligations is summarized as follows:

The calculation of the pension benefit obligation is sensitive to the discount rate assumption. Since January 1, 2017, management determined that the discount rate assumption should be adjusted from 1.6% to 1.9% as a result of changes in the European economic environment.

The Company has an unlimited number of authorized common shares (being voting and participating shares) with no par value, as well as an unlimited number of preferred, first and second ranking shares, issuable in series, with rights and privileges specific to each class, with no par value.

Common shares issued in connection with "At-the-Market" ("ATM") drawdowns

April 2016 ATM Program

On April 1, 2016, the Company entered into an ATM sales agreement (the "April 2016 ATM Program"), under which the Company was able, at its discretion and from time to time, to sell up to 3 million common shares through ATM issuances on the NASDAQ for aggregate gross proceeds of up to approximately $10.0 million. The April 2016 ATM program provides that common shares were to be sold at market prices prevailing at the time of sale and, as a result, prices varied.

Between April 1, 2016 and March 24, 2017 the Company issued a total of 1,706,968 common shares under the April 2016 ATM Program at an average issuance price of $3.52 per share for aggregate gross proceeds of approximately $6.0 million less cash transaction costs of approximately $190,000 and previously deferred financing costs of approximately $225,000.

March 2017 ATM Program

On March 28, 2017, the Company commenced a new ATM offering pursuant to its existing ATM Sales Agreement, dated April 1, 2016, under which the Company was able, at its discretion, from time to time, to sell up to a maximum of 3 million common shares through ATM issuances on the NASDAQ, up to an aggregate amount of $9.0 million (the "March 2017 ATM Program"). The common shares were to be sold at market prices prevailing at the time of the sale of the common shares and, as a result, sale prices varied.

Between March 28, 2017 and April 18, 2017, the Company issued a total of 597,994 common shares under the March 2017 ATM Program at an average issuance price of $2.97 per share for aggregate gross proceeds of approximately $1,780,000 less cash transaction costs of approximately $55,000 and previously deferred financing costs of approximately $65,000.

April 2017 ATM Program

On April 27, 2017, the Company entered into a New ATM Sales Agreement and filed with the Securities and Exchange Commission (the "SEC") a prospectus supplement (the "April 2017 ATM Prospectus Supplement") related to sales and distributions of up to a maximum of 2,240,000 common shares through ATM issuances on the NASDAQ, up to an aggregate amount of approximately $6.9 million under the New ATM Sales Agreement. The common shares will be sold at market prices prevailing at the time of the sale of the common shares and, as a result, prices may vary. The New ATM Sales Agreement and the April 2017 ATM Prospectus Supplement superseded and replaced the March 2017 ATM Program, which itself superseded and replaced the April 2016 ATM Program. The April 2017 ATM Prospectus Supplement supplements the base prospectus included in the Company's Shelf Registration Statement on Form F-3, as amended (the "2017 Shelf Registration Statement"), which was declared effective by the SEC on April 27, 2017. The 2017 Shelf Registration Statement allows us to offer up to $50 million of common shares and is effective for a three-year period.

Between May 30, 2017 and June 9, 2017, the Company issued a total of 316,319 common shares under the April 2017 ATM Program at an average issuance price of $1.09 per share for aggregate gross proceeds of approximately $345,000 less cash transaction costs of approximately $11,500 and previously deferred financing costs of approximately $48,000. Because of these issuances, the exercise price of the Series A warrants issued in March 2015 was adjusted to $1.07 pursuant to the anti-dilution provisions contained in such warrants.

November 2016 Offering

On November 1, 2016, the Company completed a registered direct offering of 2,100,000 units (the "Units"), with each Unit consisting of one common share or one pre-funded warrant to purchase one common share and 0.45 of a warrant to purchase one common share (the "November 2016 Offering").

Total gross cash proceeds raised through the November 2016 Offering amounted to approximately $7.6 million, less cash transaction costs of approximately $1.0 million, and previously deferred transactions costs of approximately $27,000. The warrants are exercisable six months after their date of issuance and for a period of three years thereafter at an exercise price of $4.70 per share.

The warrants contain a call provision which provides that, in the event the Company's common shares trade at or above $10.00 on the market during a specified measurement period and subject to a minimum volume of trading during such measurement period, then, subject to certain conditions, the Company has the right to call for cancellation all or any portion of the warrants which are not exercised by holders within 10 trading days following receipt of a call notice from the Company. Upon complete exercise for cash, these warrants would result in the issuance of an aggregate of 945,000 common shares that would generate additional proceeds of approximately $4.4 million, although these warrants may be exercised on a "net" or "cashless" basis. See also note 5 - Warrant liability.

The Company estimated the fair value attributable to the warrants as of the date of grant by applying probability to multiple Black-Scholes pricing models, to which the following weighed average assumptions were applied: a risk-free annual interest rate of 0.63%, an expected volatility of 112.48%, an expected life of 1.63 years and a dividend yield of 0.0%. In addition, the Company reduced the fair value of these warrants to take into consideration the fair value of the $10.00 call option, which was also calculated using the Black-Scholes pricing model with similar assumptions as described above. As a result, on November 1, 2016, being the date of issuance, the total fair value of the share purchase warrants was estimated at $400,000.

The pre-funded warrants were offered in the November 2016 Offering to the investor because the purchase of Units would have resulted in the investor beneficially owning more than an "initial beneficial ownership limitation" of 4.9% of our common shares following the offering. The pre-funded warrants, which were exercisable immediately upon issuance and

for a period of five years at an exercise price of $3.60 per share, were fully exercised between November 10, 2016 and December 19, 2016. Total gross proceeds payable to the Company in connection with the exercise of the pre-funded warrants were pre-funded by the investor and therefore were included in the proceeds of the offering. No additional consideration was required to be paid to the Company upon exercise of the pre-funded warrants.

Total gross proceeds of the November 2016 Offering were allocated as follows: $400,000 was allocated to the warrant liability, $3,239,000 was allocated to the pre-funded warrants, and the balance of $3,921,000 was allocated to Share capital. Transaction costs were allocated to the liability and equity components in proportion to the allocation of proceeds. As such, an amount of $56,000 was allocated to the warrant liability and immediately recognized in general and administrative expenses in the consolidated statement of comprehensive loss, an amount of $544,000 was allocated to Share capital and an amount of $450,000 was allocated to pre-funded warrants. Upon exercise of the pre-funded warrants, the net proceeds initially allocated to the pre-funded warrants were re-allocated to Share capital.

Shareholder rights plan

The Company has a shareholder rights plan (the "Rights Plan") that provides the Board of Directors and the Company's shareholders with additional time to assess any unsolicited take-over bid for the Company and, where appropriate, to pursue other alternatives for maximizing shareholder value. Under the Rights Plan, one right has been issued for each currently issued common share, and one right will be issued with each additional common share that may be issued from time to time. The Rights Plan was approved, ratified and confirmed by the Company's shareholders at its annual meeting of shareholders held on May 10, 2016.

The following tables summarize the activity under the Stock Option Plan.

8 Compensation of key management and other employee benefit expenses

Compensation awarded to key management and other employee benefit expenses are summarized below.

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* Key management includes the Company's directors and members of the executive management team.

9 Supplemental disclosure of cash flow information