UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934

Date of Report (date of earliest event reported): July 31, 2013

ACTAVIS, INC.

(Exact name of registrant as specified in its charter)

Morris Corporate Center III

400 Interpace Parkway

Parsippany, New Jersey 07054

(Address of principal executive offices)

(862) 261-7000

(Registrant’s telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

Item 8.01. Other Events.

On July 31, 2013, Actavis, Inc. (“Actavis”) and Warner Chilcott plc (“Warner Chilcott”) issued a joint press release announcing the record dates and meeting dates for their respective stockholder and shareholder meetings in connection with the proposed acquisition of Warner Chilcott by Actavis pursuant to the Transaction Agreement (the “Transaction Agreement”), dated as of May 19, 2013, by and among Actavis, Warner Chilcott, Actavis Limited, Actavis Ireland Holding Limited, Actavis W.C. Holding LLC and Actavis W.C. Holding 2 LLC. The special meeting of Actavis is being held to seek stockholder approval of the Transaction Agreement and related matters. There will be two meetings of the Warner Chilcott shareholders in connection with the transaction, the first of which is convened by order of the Irish High Court, and the second of which is an extraordinary general meeting held pursuant to Warner Chilcott’s articles of association. Both meetings are being held to seek shareholder approval of the scheme of arrangement in accordance with Irish law, and the approval of related matters by the Warner Chilcott shareholders will also be sought at the extraordinary general meeting.

Each of Actavis’ and Warner Chilcott’s shareholders of record at the close of business on Tuesday, July 30, 2013, will be entitled to vote at their respective shareholder meetings. Each shareholder meeting is scheduled to be held on Tuesday, September 10, 2013. The Actavis stockholder meeting will be held at Parsippany Hilton, 1 Hilton Ct Parsippany, NJ 07054. The Warner Chilcott shareholder meetings will be held at The K Club, Straffan, Co. Kildare, Ireland. Actavis and Warner Chilcott will begin mailing a joint proxy statement/prospectus to their respective shareholders in the coming days.

In the joint press release, Actavis and Warner Chilcott also announced that they will begin mailing a definitive joint proxy statement/prospectus to their stockholders and shareholders of record, respectively, in connection with the Transaction Agreement.

A copy of the press release is attached hereto as Exhibits 99.1 and is incorporated herein by reference.

Item 9.01 Financial Statements and Exhibits.

(d) List of Exhibits

IMPORTANT INFORMATION FOR INVESTORS AND SHAREHOLDERS

This communication does not constitute an offer to sell or the solicitation of an offer to buy any securities or a solicitation of any vote or approval. New Actavis has filed with the SEC a registration statement on Form S-4 containing a joint proxy statement of Warner Chilcott and Actavis that also constitutes a prospectus of New Actavis. The registration statement has been declared effective by the SEC. In the coming days, each of Actavis and Warner Chilcott will mail to its stockholders or shareholders the proxy statement/prospectus. In addition, each of New Actavis, Actavis and Warner Chilcott will file with the SEC other documents with respect to the proposed transaction. INVESTORS AND SECURITY HOLDERS OF ACTAVIS AND WARNER CHILCOTT ARE URGED TO READ THE PROXY STATEMENT/PROSPECTUS AND OTHER DOCUMENTS FILED OR TO BE FILED WITH THE SEC CAREFULLY AND IN THEIR ENTIRETY WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION. Investors and security holders may obtain free copies of the registration statement and the proxy statement/prospectus and other documents filed with the SEC by New Actavis, Actavis and Warner Chilcott through the website maintained by the SEC at http://www.sec.gov. Copies of the documents filed with the SEC by New Actavis and Actavis may be obtained free of charge on Actavis’s internet website at www.actavis.com or by contacting Actavis’s Investor Relations Department at (862) 261-7488. Copies of the documents filed with the SEC by Warner Chilcott may be obtained free of charge on Warner Chilcott’s internet website at www.wcrx.com or by contacting Warner Chilcott’s Investor Relations Department at (973) 442-3200.

Actavis, Warner Chilcott, their respective directors and certain of their executive officers may be considered participants in the solicitation of proxies in connection with the proposed transaction. Information about the directors and executive officers of Warner Chilcott is set forth in its Annual Report on Form 10-K for the year ended December 31, 2012, which was filed with the SEC on February 22, 2013, its Quarterly Report on Form 10-Q for the quarter ended March 31, 2013, which was filed with the SEC on May 10, 2013, its Quarterly Report on Form 10-Q for the quarter ended June 30, 2013, which was filed with the SEC on July 24, 2013, its proxy statement for its 2013 annual meeting of stockholders, which was filed with the SEC on April 5, 2013, and its Current Reports on Form 8-K that were filed with the SEC on May 2, 2013 and May 8, 2013. Information about the directors and executive officers of

Actavis is set forth in its Annual Report on Form 10-K for the year ended December 31, 2012, which was filed with the SEC on February 28, 2013 (as revised pursuant to Actavis’ Current Report on Form 8-K dated as of June 17, 2013, which was filed with the SEC on June 18, 2013), its Quarterly Report on Form 10-Q for the quarter ended March 31, 2013, which was filed with the SEC on May 7, 2013, its Quarterly Report on Form 10-Q for the quarter ended June 30, 2013, which was filed with the SEC on July 30, 2013, its proxy statement for its 2013 annual meeting of stockholders, which was filed with the SEC on March 29, 2013, and its Current Reports on Form 8-K that were filed with the SEC on January 29, 2013 and May 13, 2013. Other information regarding the participants in the proxy solicitations and a description of their direct and indirect interests, by security holdings or otherwise, are contained in the preliminary proxy statement/prospectus filed with the SEC and will be contained in the definitive proxy statement/prospectus and other relevant materials to be filed with the SEC when they become available.

CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS

Statements contained in this communication that refer to non-historical facts are forward-looking statements that reflect Actavis’ current perspective of existing information as of the date of this release. It is important to note that Actavis’ goals and expectations are not predictions of actual performance. Actual results may differ materially from Actavis’ current expectations depending upon a number of factors, risks and uncertainties affecting Actavis’ business. These factors include, among others, the inherent uncertainty associated with financial projections; restructuring in connection with, and successful close of, Actavis’ acquisition of Warner Chilcott (the “Acquisition”); subsequent integration of the Acquisition and the ability to recognize the anticipated synergies and benefits of the Acquisition; the receipt of required regulatory approvals for the Acquisition (including the approval of antitrust authorities necessary to complete the Acquisition); the anticipated size of the markets and continued demand for Actavis’ and Warner Chilcott’s products; the impact of competitive products and pricing; access to available financing (including financing for the Acquisition or refinancing of Actavis or Warner Chilcott debt) on a timely basis and on reasonable terms; maintaining a position in the Standard & Poor’s 500; the risks of fluctuations in foreign currency exchange rates; the risks and uncertainties normally incident to the pharmaceutical industry, including product liability claims and the availability of product liability insurance on reasonable terms; the difficulty of predicting the timing or outcome of pending or future litigation or government investigations; periodic dependence on a small number of products for a material source of net revenue or income; variability of trade buying patterns; changes in generally accepted accounting principles; risks that the carrying values of assets may be negatively impacted by future events and circumstances; the timing and success of product launches; the difficulty of predicting the timing or outcome of product development efforts and regulatory agency approvals or actions, if any; costs and efforts to defend or enforce intellectual property rights; difficulties or delays in manufacturing; the availability and pricing of third party sourced products and materials; successful compliance with governmental regulations applicable to Actavis’ and Warner Chilcott’s manufacturers, facilities, products and/or businesses; changes in the laws and regulations affecting, among other things, pricing and reimbursement of pharmaceutical products; changes in tax laws or interpretations that could increase Actavis’ consolidated tax liabilities; the loss of key senior management or scientific staff; and such other risks and uncertainties detailed in Actavis’ periodic public filings with the SEC including but not limited to Actavis’ Quarterly Reports on Form 10-Q for the quarters ended March 31, 2013 and June 30, 2013 and Actavis’ Annual Report on Form 10-K for the year ended December 31, 2012 (as revised pursuant to Actavis’ Current Report on Form 8-K dated as of June 17, 2013, which was filed with the SEC on June 18, 2013), as well as the Form S-4. Except as expressly required by law, Actavis disclaims any intent or obligation to update these forward-looking statements.

STATEMENT REQUIRED BY THE TAKEOVER RULES

The directors of Actavis accept responsibility for the information contained in this communication. To the best of the knowledge and belief of the directors of Actavis (who have taken all reasonable care to ensure such is the case), the information contained in this communication is in accordance with the facts and does not omit anything likely to affect the import of such information.

BofA Merrill Lynch and Greenhill & Co. are acting exclusively for Actavis and no one else in connection with the matters referred to in this communication and will not be responsible to anyone other than Actavis for providing the protections afforded to clients of BofA Merrill Lynch or Greenhill & Co. and for providing advice in relation to the acquisition of Warner Chilcott, the contents of this communication or any transaction or arrangement referred to herein.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: July 31, 2013

Index of Exhibits