Exhibit 99.1

Osmotica Pharmaceuticals plc Reports First Quarter 2019 Financial Results and
Highlights Pipeline and Business Progress

First quarter 2019 total revenue of $57.1 million; net loss of $6.2 million

Positive topline results from second Phase III clinical trials of RVL-1201 for ptosis or droopy eyelid

Bridgewater, NJ, May 9, 2019 — Osmotica Pharmaceuticals plc (“Osmotica” or the “Company”) (Nasdaq: OSMT), a fully integrated biopharmaceutical company, today announced business highlights and financial results for the three months ended March 31, 2019.

“During the first quarter, and more recently, we made significant progress in our transition to a specialty branded business. We have made advances in our pipeline and experienced month-over-month prescription growth in our newly launched products, M-72 and Osmolex ER. Our non-promoted portfolio continued to generate meaningful cash despite the unfavorable competitive dynamics in generic markets,” said Brian Markison, Chief Executive Officer.

“As disclosed earlier in the week, we also completed two Phase III clinical trials for one of our late-stage pipeline products, RVL-1201 (oxymetazoline hydrochloride ophthalmic solution, 0.1%), which is in development for the treatment of acquired blepharoptosis (or droopy eyelid). We are very excited about the positive topline data from our recently completed clinical trials that provides additional evidence of the safety and efficacy of RVL-1201. We are preparing our submission to the FDA later this year, and, if approved, we could have a product on the market as soon as the second half of 2020,” added Markison.

First Quarter 2019 Financial Results

· Total revenues were $57.1 million, compared to $59.8 million in the first quarter of 2018;

· Net loss was $6.2 million, compared to a net loss of $4.6 million in the first quarter of 2018;

· Adjusted EBITDA(1) was $16.4 million, compared to Adjusted EBITDA of $20.5 million in the first quarter of 2018; and

· Cash and cash equivalents were $63.1 million and debt (net of deferred financing costs) was $267.9 million as of March 31, 2019.

(1)Adjusted EBITDA is a non-GAAP measure. Adjusted EBITDA is more fully described and reconciled from net loss determined under U.S. generally accepted accounting principles (“GAAP”) in “Presentation of Non-GAAP Measures” and the attached table “Osmotica Pharmaceuticals plc GAAP to Non-GAAP Reconciliations.”

First Quarter 2019 Financial Results

Total revenues were $57.1 million for the three months ended March 31, 2019, compared to $59.8 million for the three months ended March 31, 2018, primarily due to a decline in net product sales.

Net product sales were $56.4 million for three months ended March 31, 2019, compared to $58.8 million for the three months ended March 31, 2018, a decrease of $2.4 million. This decrease was driven by lower net sales of methylphenidate ER, (first quarter 2019 includes M-72 which was launched in the second quarter of 2018), which decreased by 26% during the quarter compared to the prior year period due to increased market competition that resulted in lower net selling prices, partially offset by higher volumes. Net sales of VERT increased 46%, reflecting lower than estimated product returns and government rebates, partially offset by lower volumes.

Selling, general and administrative expenses increased to $21.7 million in the three months ended March 31, 2019, compared to $17.2 million in the three months ended March 31, 2018. The increase reflects additions to our field force headcount and marketing costs associated with the launch of Osmolex ER, which began in the fourth quarter of 2018, together with share-compensation expense and higher costs associated with being a public company.

Research and development expenses were $9.8 million in the three months ended March 31, 2019, compared to $10.2 million in the three months ended March 31, 2018. The decrease reflects the completion of the Phase III clinical trial of arbaclofen ER during the quarter, partially offset by the higher clinical trial expenses related to RVL-1201, additional developmental batch expenses and share-compensation expense.

Net loss for the first quarter of 2019 was $6.2 million, compared to net loss of $4.6 million in the first quarter of 2018.

Adjusted EBITDA for the first quarter of 2019 was $16.4 million, compared to Adjusted EBITDA of $20.5 million in the first quarter of 2018.

For a reconciliation of Adjusted EBITDA to net loss (income), the most comparable GAAP financial measure, please see the “Osmotica Pharmaceuticals plc GAAP to Non-GAAP Reconciliations” table at the end of this press release.

Liquidity

As of March 31, 2019, Osmotica had cash and cash equivalents of $63.1 million and $267.9 million in debt (net of deferred financing costs). The Company had $50.0 million of unused borrowing capacity available under its revolving credit facility as of March 31, 2019.

Presentation of Non-GAAP Measures

In addition to the results provided in accordance with GAAP throughout this press release, the Company has presented Adjusted EBITDA, which is a non-GAAP measurement. Adjusted EBITDA represents earnings before interest, taxes, depreciation and amortization adjusted for (i) non-operating income or expense, and (ii) the impact of certain non-cash, nonrecurring or other items that are included in net loss and EBITDA that we do not consider indicative of our ongoing operating performance. Adjusted EBITDA excludes, share-based compensation expense, management fees, IPO expenses, severance expenses. We use Adjusted EBITDA for business planning purposes, in assessing our performance and determining the compensation of substantially all of our employees, including our executive officers, and in measuring our performance relative to that of our competitors. We also believe that Adjusted EBITDA provides investors with useful information to understand our operating results and analyze financial and business trends on a period-to-period basis. Adjusted EBITDA has important limitations as an analytical tool, however, and you should not consider it in isolation or as a substitute for analysis of our results as reported under GAAP. Adjusted EBITDA is not intended to replace, and should not be considered superior to, the presentation of our financial results in accordance with GAAP. Our definition of Adjusted EBITDA may differ from similar measures reported by other companies and may not be comparable to other similarly titled measures. Adjusted EBITDA is reconciled from the net loss as determined under GAAP in the attached table “Osmotica Pharmaceuticals plc GAAP to Non-GAAP Reconciliations.”

Forward Looking Statements

This press release includes statements that express the Company’s opinions, expectations, beliefs, plans, objectives, assumptions or projections regarding future events or future results and therefore are, or may be deemed to be, “forward-looking statements.” The Company’s actual results may vary significantly from the results anticipated in these forward-looking statements, which can generally be identified by the use of forward-looking terminology, including the terms “believes,” “expects,” “may,” “will,” “should,” “seeks,” “projects,” “approximately,” “intends,” “plans,” “estimates” or “anticipates,” or, in each case, their negatives or other variations or comparable terminology. These forward-looking statements include all matters that are not historical facts. They include statements regarding the Company’s intentions, beliefs or current expectations concerning, among other things, our results of operations, financial condition, liquidity, prospects, financial guidance, growth plan, strategies, trends and other events, particularly relating to sales of current products and the development, approval and introduction of new products, FDA and other regulatory applications, approvals and actions, the continuation of historical trends, our ability to operate our business under our new capital and operating structure, and the sufficiency of our cash balances and cash generated from operating and financing activities for future liquidity and capital resource needs. By their nature, forward-looking statements involve risks and uncertainties because they relate to events and depend on circumstances that may or may not occur in the future. We may not achieve the plans, intentions or expectations disclosed in our forward-looking statements, and you should not place significant reliance on our forward-looking statements. Actual results or events could differ materially from the plans, intentions and expectations disclosed in the forward-looking statements we make. Important factors that could cause actual results and events to differ materially from those indicated in the forward-looking statements include the following: our ability to successfully develop or commercialize

new products, or do so on a timely or cost effective basis; our dependence on a limited number of products; failures of or delays in clinical trials or other delays in obtaining regulatory approval or commencing product sales for new products; the impact of legal proceedings; our ability to service our substantial debt; our ability to raise additional capital; the impact of competition from both brand and generic companies; any interruption at our manufacturing facility, our warehouses or at facilities operated by third parties that we rely on for our products; our dependence on our major customers; our ability to develop and maintain our sales capabilities; the impact of any litigation related to allegations of infringement of intellectual property; any changes to the coverage and reimbursement levels for our products by governmental authorities and other third-party payors as a result of healthcare reform or otherwise; the impact of any changes in the extensive governmental regulation that we face; manufacturing or quality control issues that we may face; and other risks and uncertainties more fully described in the “Risk Factors” section of our Annual Report on Form 10-K for the year ended December 31, 2018 and other filings that the Company makes with the Securities and Exchange Commission. These forward-looking statements speak only as of the time of this release and we do not undertake to publicly update or revise them, whether as a result of new information, future events or otherwise, except as required by law.

Conference Call

As previously announced, Osmotica management will host its first quarter 2019 conference call as follows:

Date	Thursday, May 9, 2019

Time	4:30 p.m. EDT

Toll free (U.S.)	(866) 672-5029

International	(409) 217-8312

Webcast (live and replay)	www.osmotica.com, under the “Investor & News” section

Conference call ID	2984053

The webcast will be archived for 30 days at the aforementioned URL.

About Osmotica Pharmaceuticals plc
Osmotica Pharmaceuticals plc is a fully integrated biopharmaceutical company focused on the development and commercialization of specialty products that target markets with underserved patient populations. Our diversified product portfolio in the specialty neurology and women’s health therapeutic areas, together with our non-promoted complex formulations of generic drugs, form the foundation of our unwavering commitment to improve patients’ lives.

Osmotica Pharmaceuticals plc

Condensed Consolidated Balance Sheets

(in thousands)

	March 31, 2019
	(Unaudited)			December 31, 2018

Assets
Current assets:
Cash and cash equivalents	$	63,062		$	70,834
Trade accounts receivable, net	56,887			56,424
Inventories, net	27,815			24,383
Prepaid expenses and other current assets	16,198			20,744
Total current assets	163,962			172,385
Property, plant and equipment, net	30,738			31,263
Operating lease assets	6,365			—
Intangibles, net	473,522			490,390
Goodwill	100,855			100,855
Other non-current assets	705			752
Total assets	$	776,147		$	795,645

Liabilities and Shareholders Equity
Current liabilities:
Trade accounts payable	$	20,591		$	24,870
Accrued liabilities	72,477			87,236
Current portion of long-term debt, net of deferred financing costs	795			1,774
Current portion of lease liability	2,007			—
Current portion of obligation under finance leases	125			119
Income taxes payable - current portion	496			394
Total current liabilities	96,491			—	114,393
Long-term debt, net of non-current deferred financing costs	267,080			266,803
Long-term portion of obligation under finance leases	120			138
Long-term portion of lease liability	4,577			—
Income taxes payable	1,804			1,804
Deferred taxes	24,837			26,238
Total liabilities	394,909			409,376
Commitments and contingencies
Shareholders’ equity
Ordinary shares	525			525
Additional paid in capital	491,119			489,950
Accumulated deficit	(108,560		)	(102,360		)
Accumulated other comprehensive loss	(1,846		)	(1,846		)
Total shareholders’ equity	381,238			386,269
Total liabilities and shareholders’ equity	$	776,147		$	795,645

Osmotica Pharmaceuticals plc

Condensed Consolidated Statements of Operations

(Unaudited)

(in thousands, except share and per share data)

	Three Months Ended March 31,
	2019			2018

Net product sales	$	56,400		$	58,834
Royalty revenue	721			963
Licensing and contract revenue	5			4
Total revenues	57,126			59,801
Cost of good sold (inclusive of amortization of intangibles)	29,203			33,562
Gross profit	27,923			26,239
Selling, general and administrative expenses	21,656			17,162
Research and development expenses	9,764			10,174
Total operating expenses	31,420			27,336
Operating loss	(3,497		)	(1,097		)
Interest expense and amortization of debt discount	4,501			4,843
Other non-operating income, net	(557		)	(137		)
Total other non-operating expense, net	3,944			4,706
Loss before income taxes	(7,441		)	(5,803		)
Income tax benefit	1,240			1,195
Net loss	$	(6,200	)	$	(4,607	)

Loss per share attributable to shareholders
Basic and diluted	$	(0.12	)	(0.11		)
Weighted average shares basic and diluted
Basic and diluted	52,519			42,856

Osmotica Pharmaceuticals plc

Condensed Consolidated Statements of Cash Flows

(Unaudited)

(in thousands)

	Three Months Ended March 31,
	2019			2018
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$	(6,200	)	$	(4,607	)
Adjustments to reconcile net loss to cash (used in) provided by operating activities
Depreciation and amortization	17,993			20,414
Share compensation	1,169			—
Loss on sale of fixed assets	53			—
Deferred income tax benefit	(1,401		)	(3,296		)
Bad debt provision	(84		)	(100		)
Amortization of deferred financing and loan origination fees	323			415
Change in operating assets and liabilities				—
Trade accounts receivable, net	(378		)	(23,251		)
Inventories, net	(3,432		)	(6,604		)
Prepaid expenses and other current assets	4,545			3,100
Other non-current assets	—			(272		)
Trade accounts payable	(4,279		)	32,183
Accrued and other current liabilities	(14,436		)	(10,880		)
Net cash (used in) provided by operating activities	(6,128		)	7,102
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property, plant and equipment	(635		)	(1,437		)
Net cash used in investing activities	(635		)	(1,437		)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payments to affiliates	—			(2		)
Payments on finance lease obligations	(31		)	(27		)
Repayment of insurance financing loan	(979		)	—
Debt repayment	—			(2,047		)
Net cash used in financing activities	(1,010		)	(2,076		)
Net change in cash and cash equivalents	(7,773		)	3,589
Effect on cash of change in exchange rate	—			(138		)
Cash and cash equivalents, beginning of period	70,834			34,743
Cash and cash equivalents, end of period	$	63,062		$	38,194

Osmotica Pharmaceuticals plc

GAAP to Non-GAAP Reconciliations

Adjusted EBITDA (Unaudited)

(in thousands)

	Three Months Ended
	March 31,
	2019			2018

Net Loss	$	(6,200	)	$	(4,607	)
Interest expense and amortization of debt discount	4,501			4,843
Income tax benefit	(1,240		)	(1,195		)
Depreciation and Amortization Expense	17,993			20,414

EBITDA	15,053			19,455

Management Fees	(43		)	250
IPO expenses				396
Severance expenses	182			445
Share compensation expense	1,169			—

Adjusted EBITDA	$	16,361		$	20,545