Exhibit 99.1

McKESSON REPORTS FISCAL 2020 FIRST-QUARTER RESULTS

IRVING, Texas, July  31, 2019 – McKesson Corporation (NYSE:MCK) today reported that revenues for the first quarter ended June 30, 2019, were $55.7 billion compared to $52.6 billion a year ago, an increase of 6% on a reported basis and an increase of 7% on an FX-adjusted basis.

On the basis of U.S. generally accepted accounting principles (“GAAP”), first-quarter earnings per diluted share from continuing operations was $2.27, compared to a loss per diluted share of $(0.69) a year ago.

First-quarter Adjusted Earnings per diluted share was $3.31, an increase of 14% compared to $2.90 a year ago, primarily driven by growth in the U.S. Pharmaceutical and Specialty Solutions segment and a lower share count, partially offset by a higher tax rate.

“McKesson is off to a strong start in fiscal 2020, and our first-quarter earnings performance exceeded our expectations,” said Brian Tyler, chief executive officer. “Based on the momentum from our first-quarter results and our confidence in the full year outlook, we are raising our previous guidance range for fiscal 2020 and now expect Adjusted Earnings per diluted share of $14.00 to $14.60.”

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For the first quarter, McKesson used cash from operations of $51 million, and invested $111 million internally, resulting in negative free cash flow of $162 million. During the quarter, McKesson paid $46 million for acquisitions, and returned $759 million of cash to shareholders via $684 million of common stock repurchases and $75 million of dividend payments. The Board of Directors also approved a 5% increase in the quarterly dividend to $0.41 per share. The company ended the quarter with cash and cash equivalents of $1.9 billion.

U.S. Pharmaceutical and Specialty Solutions Segment

European Pharmaceutical Solutions Segment

Medical-Surgical Solutions Segment

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Other remaining businesses (primarily including McKesson Canada, McKesson Prescription Technology Solutions (MRxTS) and the equity method investment in the Change Healthcare Joint Venture (Change Healthcare))

Company Updates

Fiscal 2020 Outlook and Change Healthcare Update

McKesson raised fiscal 2020 Adjusted Earnings per diluted share guidance to $14.00 - $14.60 from a range of $13.85 - $14.45.

Following the completion of the Change Healthcare, Inc. IPO, McKesson owns approximately 58.5% of Change Healthcare, reduced from 70%. McKesson will continue to report the equity income from its interest in Change Healthcare based on its revised equity ownership percentage and with a one-month lag.

McKesson reaffirmed the guidance range for adjusted equity earnings from Change Healthcare of approximately $250 million to $270 million in fiscal 2020. This range reflects McKesson’s revised equity ownership, and includes the expected benefit of lower interest expense for Change Healthcare driven by its repayment of long-term debt.

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Dividend Declaration

The company’s Board of Directors yesterday declared a 5% increase in the regular quarterly dividend to 41 cents per share of common stock. The dividend will be payable on October 1, 2019, to stockholders of record on September 3, 2019.

Conference Call Details

The company has scheduled a conference call for today, Wednesday, July 31 ^st , at 5:00 PM ET to discuss the company’s financial performance. A live audio webcast of the conference call will be available on McKesson’s Investor Relations website at http://investor.mckesson.com. The conference call can also be accessed by dialing 323-994-2093. The password is ‘McKesson’. A telephonic replay of this conference call will be available for five calendar days. For individuals wishing to listen to the replay, the dial-in number is 719-457-0820 and the pass code is 5579684. An archive of the conference call will also be available on the company’s Investor Relations website at http://investor.mckesson.com.

Upcoming Investor Events

McKesson management will be participating in the following investor conference:

Audio webcasts will be available live and archived on the company’s Investor Relations website at http://investor.mckesson.com. A complete listing of upcoming events for the investment community is available on the company’s Investor Relations website.

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Adjusted Earnings

McKesson separately reports financial results on the basis of Adjusted Earnings. Adjusted Earnings is a non-GAAP financial measure defined as GAAP income from continuing operations, excluding amortization of acquisition-related intangible assets, transaction-related expenses and adjustments, LIFO inventory-related adjustments, gains from antitrust legal settlements, restructuring and asset impairment charges, and other adjustments. A reconciliation of McKesson’s GAAP financial results to Adjusted Earnings is provided in Schedules 2 and 3 of the financial statement tables included with this release.

The company does not provide forward-looking guidance on a GAAP basis prospectively as McKesson is unable to provide a quantitative reconciliation of this forward-looking non-GAAP measure to the most directly comparable forward-looking GAAP measure, without unreasonable effort, because McKesson cannot reliably forecast LIFO inventory-related adjustments, gains from antitrust legal settlements, restructuring and asset impairment charges, and other adjustments, which are difficult to predict and estimate. These items are inherently uncertain and depend on various factors, many of which are beyond the company’s control, and as such, any associated estimate and its impact on GAAP performance could vary materially.

FX-Adjusted

McKesson also presents its financial results on an FX-adjusted basis. The company conducts business worldwide in local currencies, including the Euro, British pound and Canadian dollar. As a result, the comparability of the financial results reported in U.S. dollars can be affected by changes in foreign currency exchange rates. FX-adjusted information is presented to provide a framework for assessing how the company’s business performed excluding the effect of foreign currency exchange rate fluctuations. The supplemental FX-adjusted information of the company’s GAAP financial results and Adjusted Earnings (Non-GAAP) is provided in Schedule 3 of the financial statement tables included with this release.

Free Cash Flow

McKesson also provides free cash flow, a non-GAAP measure. Free cash flow is defined as net cash provided by operating activities less payments for property, plant and equipment and capitalized software expenditures, as outlined in the company’s condensed consolidated statements of cash flows.

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Cautionary Statements

Except for historical information contained in this press release, matters discussed may constitute “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, that involve risks and uncertainties that could cause actual results to differ materially from those in those statements. The reader should not place undue reliance on forward-looking statements, which speak only as of the date they are first made. Except to the extent required by law, the company undertakes no obligation to publicly update forward-looking statements. Forward-looking statements may be identified by their use of terminology such as “believes”, “expects”, “anticipates”, “may”, “will”, “should”, “seeks”, “approximately”, “intends”, “plans”, “estimates” or the negative of these words or other comparable terminology. The discussion of financial trends, strategy, plans, assumptions or intentions may also include forward-looking statements. It is not possible to predict or identify all such risks and uncertainties. We encourage investors to read the important risk factors described in the company’s Form 10-K, Form 10-Q and Form 8-K reports filed with the Securities and Exchange Commission. These risk factors include, but are not limited to: changes in the U.S. healthcare industry and regulatory environment; managing foreign expansion, including the related operating, economic, political and regulatory risks; changes in the Canadian healthcare industry and regulatory environment; exposure to European economic conditions, including recent austerity measures taken by certain European governments; changes in the European regulatory environment with respect to privacy and data protection regulations; fluctuations in foreign currency exchange rates; the company’s ability to successfully identify, consummate, finance and integrate acquisitions; the company’s results of operations impacted by the Change Healthcare joint venture; the company’s ability to manage and complete divestitures and distributions; material adverse resolution of pending legal proceedings; competition and industry consolidation; substantial defaults in payment or a material reduction in purchases by, or the loss of, a large customer or group purchasing organization; the loss of government contracts as a result of compliance or funding challenges; public health issues in the U.S. or abroad; cyberattack, natural disaster, or malfunction of sophisticated internal computer systems to perform as designed; the adequacy of insurance to cover property loss or liability claims; the company’s proprietary products and services may not be adequately protected, and its products and solutions may be found to infringe on the rights of others; system errors or failure of our technology products or services to conform to specifications; disaster or other event causing interruption of customer access to data residing in our service centers; changes in circumstances that could impair our goodwill, intangible and other long-lived assets or investments; new or revised tax legislation or challenges to our tax positions; general economic conditions, including changes in the financial markets that may affect the availability and cost of credit to the company, its customers or suppliers; changes in accounting principles generally accepted in the United States of America; withdrawal from participation in multiemployer pension plans or if such plans are reported to have underfunded liabilities; inability to realize the expected benefits from the company’s restructuring and business process initiatives; difficulties with outsourcing and similar third party relationships; risks associated with the company’s retail expansion; and the company’s inability to keep existing retail store locations or open new retail locations in desirable places.

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About McKesson Corporation

McKesson Corporation, currently ranked 7th on the FORTUNE 500, is a global leader in healthcare supply chain management solutions, retail pharmacy, healthcare technology, community oncology and specialty care. McKesson partners with life sciences companies, manufacturers, providers, pharmacies, governments and other healthcare organizations to help provide the right medicines, medical products and healthcare services to the right patients at the right time, safely and cost-effectively. United by our ICARE shared principles, our employees work every day to innovate and deliver opportunities to improve patient care in every setting — one product, one partner, one patient at a time. McKesson has been named a “Most Admired Company” in the healthcare wholesaler category by FORTUNE, a “Best Place to Work” by the Human Rights Campaign Foundation, and a top military-friendly company by Military Friendly. For more information, visit www.mckesson.com.

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Contacts:

Holly Weiss, 972-969-9174 (Investors and Financial Media)

Holly.Weiss@McKesson.com

Kristin Chasen, 415-983-8974 (General and Business Media)

Kristin.Chasen@McKesson.com

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Refer to the section entitled “Financial Statement Notes” of this release.

Refer to our applicable filings with the SEC for additional disclosures including our Quarterly Reports on Form 10-Q for fiscal 2020 and 2019 as well as our Annual Report on Form 10-K for fiscal 2019.

Refer to the section entitled “Financial Statement Notes” of this release.

For more information relating to the Adjusted Earnings (Non-GAAP) and FX-Adjusted (Non-GAAP) definitions, refer to the section entitled “Supplemental Non-GAAP Financial Information” of this release.

Refer to the section entitled “Financial Statement Notes” of this release.

For more information relating to the Adjusted Earnings (Non-GAAP) and FX-Adjusted (Non-GAAP) definitions, refer to the section entitled “Supplemental Non-GAAP Financial Information” of this release.

McKESSON CORPORATION

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SUPPLEMENTAL NON-GAAP FINANCIAL INFORMATION

In an effort to provide investors with additional information regarding the Company’s financial results as determined by generally accepted accounting principles (“GAAP”), McKesson Corporation (the “Company” or “we”) also presents the following Non-GAAP measures in this press release. The Company believes the presentation of Non-GAAP measures provides useful supplemental information to investors with regard to its operating performance, as well as assists with the comparison of its past financial performance to the Company’s future financial results. Moreover, the Company believes that the presentation of Non-GAAP measures assists investors’ ability to compare its financial results to those of other companies in the same industry. However, the Company’s Non-GAAP measures used in the press tables may be defined and calculated differently by other companies in the same industry.

Amortization of acquisition-related intangibles - Amortization expenses of intangible assets directly related to business combinations and the formation of joint ventures.

Transaction-related expenses and adjustments - Transaction, integration and other expenses that are directly related to business combinations, the formation of joint ventures, divestitures and other transaction-related costs including initial public offering costs. Examples include transaction closing costs, professional service fees, legal fees, restructuring or severance charges, retention payments and employee relocation expenses, facility or other exit-related expenses, certain fair value adjustments including deferred revenues, contingent consideration and inventory, recoveries of acquisition-related expenses or post-closing expenses, bridge loan fees, and gains or losses on business combinations and divestitures of businesses that do not qualify as discontinued operations.

LIFO inventory-related adjustments - LIFO inventory-related non-cash expense or credit adjustments.

Gains from antitrust legal settlements - Net cash proceeds representing the Company’s share of antitrust lawsuit settlements.

Restructuring and asset impairment charges - Non-acquisition related restructuring charges that are incurred for programs in which we change our operations, the scope of a business undertaken by our business units, or the manner in which that business is conducted as well as long-lived asset impairments. Such charges may include employee severance, retention bonuses, facility closure or consolidation costs, lease or contract termination costs, asset impairments, accelerated depreciation and amortization, and other related expenses. The restructuring programs may be implemented due to the sale or discontinuation of a product line, reorganization or management structure changes, headcount rationalization, realignment of operations or products, and/or company-wide cost saving initiatives. The amount and/or frequency of these restructuring charges are not part of our underlying business, which include normal levels of reinvestment in the business. Any credit adjustments due to subsequent changes in estimates are also excluded from the Adjusted Earnings.

Other adjustments - The Company evaluates the nature and significance of transactions qualitatively and quantitatively on an individual basis and may include them in the determination of our Adjusted Earnings from time to time. While not all-inclusive, other adjustments may include: adjustments to claim and litigation reserves for estimated probable losses and settlements; other asset impairments; certain discrete benefits and subsequent true-up adjustments related to the December 2017 enactment of the 2017 Tax Cuts and Jobs Act; gains or losses from debt extinguishment; and other similar substantive and/or infrequent items as deemed appropriate. Prior to fiscal 2020, this category also included certain gains or losses from divestitures of businesses that did not qualify as discontinued operations.

Income taxes on Adjusted Earnings are calculated in accordance with Accounting Standards Codification (“ASC”) 740, “Income Taxes,” which is the same accounting principle used by the Company when presenting its GAAP financial results.

Additionally, our equity method investment in Change Healthcare Joint Venture’s financial results are adjusted for the above noted items.

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SUPPLEMENTAL NON-GAAP FINANCIAL INFORMATION (continued)

The Company internally uses both GAAP and Non-GAAP financial measures in connection with its own financial planning and reporting processes. Specifically, Adjusted Earnings serves as one of the measures management utilizes when allocating resources, deploying capital and assessing business performance and employee incentive compensation. The Company conducts its businesses internationally in local currencies, including Euro, British pound sterling and Canadian dollars. As a result, the comparability of our results reported in U.S. dollars can be affected by changes in foreign currency exchange rates. We present FX-Adjusted information to provide a framework for assessing how our business performed excluding the estimated effect of foreign currency exchange rate fluctuations. Nonetheless, Non-GAAP financial results and related measures disclosed by the Company should not be considered a substitute for, nor superior to, financial results and measures as determined or calculated in accordance with GAAP.