EXHIBIT 99.1

         DECEMBER 2, 2004, INVESTOR FREQUENTLY ASKED QUESTIONS AND ANSWERS

         FROM TIME TO TIME, INVESTOR RELATIONS WILL PROVIDE FAQS ON VARIOUS
         TOPICS OF INTEREST TO INVESTORS. THE FOLLOWING IS A COMPILATION OF
         FREQUENTLY ASKED QUESTIONS AND ANSWERS.

Q        WHAT IS THE OUTLOOK FOR THE GROSS MARGIN? WHAT IS THE EXPECTED IMPACT
         OF THE BAYER AGREEMENT ON GROSS MARGIN?

A        The company anticipates that the gross margin will continue to be
         impacted by the company's product sales mix, production volumes and
         increased spending associated with our compliance efforts.

         Looking forward, the Bayer transaction will have an unfavorable impact
         on our gross margin, as we will pay a substantial royalty of greater
         than 50 percent to Bayer on the U.S. sales of AVELOX, CIPRO and ADALAT.

Q        WHAT IS THE IMPACT OF THE BAYER AGREEMENT ON SELLING, GENERAL AND
         ADMINISTRATIVE EXPENSES?

A        Looking forward, we plan to integrate about 800-900 Bayer sales
         representatives into Schering-Plough in the 2004 fourth quarter. As a
         result, we expect our sales force costs to increase accordingly.

Q        WHAT IS YOUR REACTION TO THE APPROVAL OF THE HOMELAND INVESTMENT ACT?

A        The President signed the American Jobs Creation Act into law on October
         22. This law, which included the important Homeland Investment Act,
         promises to benefit the U.S. economy and foster job creation. For
         Schering-Plough, the company is pleased that it may enable us to access
         cash held overseas at a lower tax rate and strengthen our domestic
         operations here in the United States.

Q        ONCE YOU HAVE REPATRIATED THE OVERSEAS FUNDS, WHAT DO YOU INTEND TO DO
         WITH THE MONEY?

A        Before any dividends from foreign subsidiaries can be provided to the
         domestic parent company, the legislation requires that companies
         prepare a domestic reinvestment plan. Until the law can be fully
         analyzed and a proper reinvestment plan has been prepared and approved
         by senior management, it would be premature to speculate on how the
         repatriated funds might be spent.

         In addition, there is little official guidance on the specific
         allowable uses of the repatriated earnings. We are currently assessing
         the legislation's potential application for Schering-Plough.

Q        WHAT WERE SALES OF ZETIA AND VYTORIN IN THE 2004 THIRD QUARTER?

A        Global cholesterol franchise sales, which include ZETIA and VYTORIN,
         totaled $344 million in the 2004 third quarter compared with sales of
         $137 million in 2003.

         Global sales of ZETIA in the 2004 third quarter were $294 million,
         including $256 million in U.S. sales. This compares to 2003 third
         quarter global ZETIA sales of $137 million.

         Global sales of VYTORIN in the 2004 third quarter were $50 million, of
         which $42 million came from the U.S. VYTORIN was launched in the U.S.
         during the 2004 third quarter.

Q        DOES SCHERING-PLOUGH HAVE INVENTORY MANAGEMENT AGREEMENTS WITH ITS
         WHOLESALERS?

A        Schering-Plough recently put in place inventory management programs
         with certain key customers. Our goal is to maintain a consistent supply
         of products to the wholesaler, retailer, and patient to fill true
         demand. We will continue to closely monitor our supply chain and trade
         inventory levels to ensure this goal is met.

Q        WHAT WILL BE THE IMPACT GOING FORWARD OF THE MANDATORY CONVERTIBLE
         PREFERRED STOCK DIVIDEND?

A        On Aug. 10, 2004, Schering-Plough issued 28.75 million shares of 6
         percent mandatory convertible preferred stock with a face value of $1.4
         billion. The mandatory conversion date of the shares is Sept. 14, 2007.
         The preferred stock accrues dividends at an annual rate of 6 percent on
         shares outstanding.

         As a result, the company will make an after-tax payment of
         approximately $86 million ($0.06 per share) each year for the preferred
         stock dividend, assuming no conversions take place, until the mandatory
         conversion in September 2007. This dividend payment will accrue on a
         quarterly basis and thus, lower net income available to common
         shareholders.

Q        WHAT IS THE STATUS OF YOUR CONSENT DECREE OBLIGATIONS? HAVE YOU
         COMPLETED THE BULK OF THE WORK REQUIRED?

A        As of September 30, 2004 we have completed 142 of 212 significant steps
         and 20 of 33 validation actions - and so far our teams have met this
         unprecedented challenge without incurring any payments for missed
         deadlines. We plan to continue to work diligently toward completing
         these deadlines on time; however, we will not sacrifice quality work in
         order to meet a deadline.

         While we have completed a large portion of our work, it is important to
         note that the fourth quarter is still a steep part of the compliance
         curve.

         In addition, the Consent Decree contains a sunset provision that
         permits the Company to petition the Court to dissolve the Decree if,
         during any five year period following the entry of the Decree (May 20,
         2002), FDA has not notified the Company that there has been a
         significant violation of FDA law, regulations, or the Decree. If these
         conditions are satisfied, the Decree states that FDA will not oppose
         the Company's petition. The earliest the Company would be in a position
         to submit such a petition would be May, 2007 (five years after the
         entry of the Decree).

         Note: The total number of significant steps and validation actions has
         been revised from year-end 2003 to account for certain product
         discontinuations and/or outsourcing to third-party manufacturers.

Q        HAVE THERE BEEN ANY CHANGES TO YOUR PRODUCT PIPELINE?

A        Schering-Plough from time to time updates public information about its
         products in development, also known as its "Product Pipeline." The
         information, updated as of November 2004, is available on the
         Schering-Plough Web site at www.schering-plough.com under "investor
         relations/investor publications".

         Schering-Plough undertakes no obligation to update the information in
         the future, and readers should note the date of information when
         referring to the product pipeline or other historical information
         available on the Web site.

         The following is a summary of the recent changes to the Schering-Plough
         Product Pipeline:

         PHASE II

         New to this phase is the PDE 5 Inhibitor as a treatment for erectile
         dysfunction.

         PHASE III

         REMICADE

         Two new indications have been added to this phase: juvenile idiopathic
         arthritis and pediatric Crohn's disease.

         NDA/HRD FILED

         U.S. and international regulatory submissions have been accepted as
         filed for TEMODAR as a treatment of gliomas, a form of brain cancer.
         The U.S. FDA has granted a priority review.

         JNDA FILED

         A new JNDA Filed section has been added to the Product Pipeline to
         track company regulatory filings of key products in Japan.

         As previously disclosed, ZETIA for monotherapy treatment of high
         cholesterol was filed in Japan in the 2003 fourth quarter.



         DISCLOSURE NOTICE: This Investor FAQ contains "forward-looking
         statements" within the meaning of the Securities Litigation Reform Act
         of 1995, including the outlook for our gross margin and the potential
         impacts of implementation of the strategic agreement with Bayer.
         Forward-looking statements relate to expectations or forecasts of
         future events and not to historical information. Schering-Plough does
         not assume the obligation to update any forward-looking statement.
         There are no guarantees about what our gross margin will be in the
         future, the impacts of the strategic agreement or the performance of
         Schering-Plough stock or Schering-Plough's business. Actual results may
         vary materially from forward-looking statements made here or in other
         Schering-Plough written or spoken communications due to many factors
         and uncertainties, which include the market acceptance of ZETIA in
         Japan, trade buying patterns for Schering-Plough products and Bayer
         products covered by the strategic agreement (together, "products"), the
         introduction and performance of competitive products, legislation that
         may impact the pricing/ availability of the products and other items
         impacting Schering-Plough, the pharmaceutical industry, and business
         generally, all as discussed in Schering-Plough's Securities and
         Exchange Commission filings, including the 10-Q filed October 28, 2004.