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xlink:title="0602 - Disclosure - Merger Agreement with Schering Plough Corporation">
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xlink:href="mrk-20090630.xsd#mrk_MergerAgreementAbstract"
xlink:label="mrk_MergerAgreementAbstract" /> <loc xlink:type="locator"
xlink:href="mrk-20090630.xsd#mrk_MergerAgreementTextBlock"
xlink:label="mrk_MergerAgreementTextBlock" /> <presentationArc
xlink:type="arc"
xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
xlink:from="mrk_MergerAgreementAbstract"
xlink:to="mrk_MergerAgreementTextBlock" order="20" use="optional"
preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
</presentationLink> <presentationLink xlink:type="extended"
xlink:role="http://merck.com/20090630/role/Restructuring"
xlink:title="0603 - Disclosure - Restructuring"> <loc
xlink:type="locator"
xlink:href="mrk-20090630.xsd#mrk_RestructuringAbstract"
xlink:label="mrk_RestructuringAbstract" /> <loc xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_RestructuringAndRelatedActivitiesDisclosureTextBlock"
xlink:label="loc_RestructuringAndRelatedActivitiesDisclosureTextBlock" />
<presentationArc xlink:type="arc"
xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
xlink:from="mrk_RestructuringAbstract"
xlink:to="loc_RestructuringAndRelatedActivitiesDisclosureTextBlock"
order="20" use="optional" priority="1"
preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" /> </presentationLink>
<presentationLink xlink:type="extended"
xlink:role="http://merck.com/20090630/role/ResearchCollaborationsAcquisitionsAndLicenseAgreements"
xlink:title="0604 - Disclosure - Research Collaborations, Acquisitions and License Agreements">
<loc xlink:type="locator"
xlink:href="mrk-20090630.xsd#mrk_ResearchCollaborationsAcquisitionsAndLicenseAgreementsAbstract"
xlink:label="mrk_ResearchCollaborationsAcquisitionsAndLicenseAgreementsAbstract" />
<loc xlink:type="locator"
xlink:href="mrk-20090630.xsd#mrk_ResearchCollaborationsAcquisitionsAndLicenseAgreementsTextBlock"
xlink:label="mrk_ResearchCollaborationsAcquisitionsAndLicenseAgreementsTextBlock" />
<presentationArc xlink:type="arc"
xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
xlink:from="mrk_ResearchCollaborationsAcquisitionsAndLicenseAgreementsAbstract"
xlink:to="mrk_ResearchCollaborationsAcquisitionsAndLicenseAgreementsTextBlock"
order="20" use="optional"
preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
</presentationLink> <presentationLink xlink:type="extended"
xlink:role="http://merck.com/20090630/role/CollaborativeArrangements"
xlink:title="0605 - Disclosure - Collaborative Arrangements"> <loc
xlink:type="locator"
xlink:href="mrk-20090630.xsd#mrk_CollaborativeArrangementsAbstract"
xlink:label="mrk_CollaborativeArrangementsAbstract" /> <loc
xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CollaborativeArrangementDisclosureTextBlock"
xlink:label="loc_CollaborativeArrangementDisclosureTextBlock" /> <presentationArc
xlink:type="arc"
xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
xlink:from="mrk_CollaborativeArrangementsAbstract"
xlink:to="loc_CollaborativeArrangementDisclosureTextBlock" order="20"
use="optional" priority="1"
preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" /> </presentationLink>
<presentationLink xlink:type="extended"
xlink:role="http://merck.com/20090630/role/FairValueMeasurements"
xlink:title="0606 - Disclosure - Fair Value Measurements"> <loc
xlink:type="locator"
xlink:href="mrk-20090630.xsd#mrk_FairValueMeasurementsAbstract"
xlink:label="mrk_FairValueMeasurementsAbstract" /> <loc
xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValueMeasurementInputsDisclosureTextBlock"
xlink:label="loc_FairValueMeasurementInputsDisclosureTextBlock" /> <presentationArc
xlink:type="arc"
xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
xlink:from="mrk_FairValueMeasurementsAbstract"
xlink:to="loc_FairValueMeasurementInputsDisclosureTextBlock" order="20"
use="optional"
preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" /> </presentationLink>
<presentationLink xlink:type="extended"
xlink:role="http://merck.com/20090630/role/DerivativeInstrumentsAndHedgingActivities"
xlink:title="0607 - Disclosure - Derivative Instruments and Hedging Activities">
<loc xlink:type="locator"
xlink:href="mrk-20090630.xsd#mrk_DerivativeInstrumentsAndHedgingActivitiesAbstract"
xlink:label="mrk_DerivativeInstrumentsAndHedgingActivitiesAbstract" /> <loc
xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock"
xlink:label="loc_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock" />
<presentationArc xlink:type="arc"
xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
xlink:from="mrk_DerivativeInstrumentsAndHedgingActivitiesAbstract"
xlink:to="loc_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock"
order="20" use="optional" priority="1"
preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" /> </presentationLink>
<presentationLink xlink:type="extended"
xlink:role="http://merck.com/20090630/role/Inventories"
xlink:title="0608 - Disclosure - Inventories"> <loc xlink:type="locator"
xlink:href="mrk-20090630.xsd#mrk_InventoriesAbstract"
xlink:label="mrk_InventoriesAbstract" /> <loc xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_InventoryDisclosureTextBlock"
xlink:label="loc_InventoryDisclosureTextBlock" /> <presentationArc
xlink:type="arc"
xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
xlink:from="mrk_InventoriesAbstract"
xlink:to="loc_InventoryDisclosureTextBlock" order="20" use="optional"
priority="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
</presentationLink> <presentationLink xlink:type="extended"
xlink:role="http://merck.com/20090630/role/JointVenturesAndOtherEquityMethodAffiliates"
xlink:title="0609 - Disclosure - Joint Ventures and Other Equity Method Affiliates">
<loc xlink:type="locator"
xlink:href="mrk-20090630.xsd#mrk_JointVenturesAndOtherEquityMethodAffiliatesAbstract"
xlink:label="mrk_JointVenturesAndOtherEquityMethodAffiliatesAbstract" /> <loc
xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_EquityMethodInvestmentsDisclosureTextBlock"
xlink:label="loc_EquityMethodInvestmentsDisclosureTextBlock" /> <presentationArc
xlink:type="arc"
xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
xlink:from="mrk_JointVenturesAndOtherEquityMethodAffiliatesAbstract"
xlink:to="loc_EquityMethodInvestmentsDisclosureTextBlock" order="20"
use="optional" priority="1"
preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" /> </presentationLink>
<presentationLink xlink:type="extended"
xlink:role="http://merck.com/20090630/role/DebtAndFinancialInstruments"
xlink:title="0610 - Disclosure - Debt and Financial Instruments"> <loc
xlink:type="locator"
xlink:href="mrk-20090630.xsd#mrk_DebtAndFinancialInstrumentAbstract"
xlink:label="mrk_DebtAndFinancialInstrumentAbstract" /> <loc
xlink:type="locator"
xlink:href="mrk-20090630.xsd#mrk_DebtAndFinancialInstrumentsDisclosureTextBlock"
xlink:label="mrk_DebtAndFinancialInstrumentsDisclosureTextBlock" /> <presentationArc
xlink:type="arc"
xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
xlink:from="mrk_DebtAndFinancialInstrumentAbstract"
xlink:to="mrk_DebtAndFinancialInstrumentsDisclosureTextBlock" order="20"
use="optional" priority="1"
preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" /> </presentationLink>
<presentationLink xlink:type="extended"
xlink:role="http://merck.com/20090630/role/Contingencies"
xlink:title="0611 - Disclosure - Contingencies"> <loc
xlink:type="locator"
xlink:href="mrk-20090630.xsd#mrk_ContingenciesAbstract"
xlink:label="mrk_ContingenciesAbstract" /> <loc xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureTextBlock"
xlink:label="loc_CommitmentsAndContingenciesDisclosureTextBlock" /> <presentationArc
xlink:type="arc"
xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
xlink:from="mrk_ContingenciesAbstract"
xlink:to="loc_CommitmentsAndContingenciesDisclosureTextBlock" order="20"
use="optional" priority="1"
preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" /> </presentationLink>
<presentationLink xlink:type="extended"
xlink:role="http://merck.com/20090630/role/StockholdersEquity"
xlink:title="0612 - Disclosure - Stockholders Equity"> <loc
xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StockholdersEquityAbstract"
xlink:label="us-gaap_StockholdersEquityAbstract" /> <loc
xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StockholdersEquityNoteDisclosureTextBlock"
xlink:label="loc_StockholdersEquityNoteDisclosureTextBlock" /> <presentationArc
xlink:type="arc"
xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
xlink:from="us-gaap_StockholdersEquityAbstract"
xlink:to="loc_StockholdersEquityNoteDisclosureTextBlock" order="20"
use="optional" priority="1"
preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" /> </presentationLink>
<presentationLink xlink:type="extended"
xlink:role="http://merck.com/20090630/role/ShareBasedCompensation"
xlink:title="0613 - Disclosure - Share Based Compensation"> <loc
xlink:type="locator"
xlink:href="mrk-20090630.xsd#mrk_ShareBasedCompensationsAbstract"
xlink:label="mrk_ShareBasedCompensationsAbstract" /> <loc
xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock"
xlink:label="us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_633621085611718750" />
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xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
xlink:from="mrk_ShareBasedCompensationsAbstract"
xlink:to="us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_633621085611718750"
order="20" use="optional" priority="2"
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<presentationLink xlink:type="extended"
xlink:role="http://merck.com/20090630/role/PensionAndOtherPostretirementBenefitPlans"
xlink:title="0614 - Disclosure - Pension and Other Postretirement Benefit Plans">
<loc xlink:type="locator"
xlink:href="mrk-20090630.xsd#mrk_PensionAndOtherPostretirementBenefitPlansAbstract"
xlink:label="mrk_PensionAndOtherPostretirementBenefitPlansAbstract" /> <loc
xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock"
xlink:label="loc_PensionAndOtherPostretirementBenefitsDisclosureTextBlock" />
<presentationArc xlink:type="arc"
xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
xlink:from="mrk_PensionAndOtherPostretirementBenefitPlansAbstract"
xlink:to="loc_PensionAndOtherPostretirementBenefitsDisclosureTextBlock"
order="20" use="optional" priority="1"
preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" /> </presentationLink>
<presentationLink xlink:type="extended"
xlink:role="http://merck.com/20090630/role/OtherIncomeExpenseNet"
xlink:title="0615 - Disclosure - Other (Income) Expense, Net"> <loc
xlink:type="locator"
xlink:href="mrk-20090630.xsd#mrk_OtherIncomeExpenseNetAbstract"
xlink:label="mrk_OtherIncomeExpenseNetAbstract" /> <loc
xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OtherIncomeAndOtherExpenseDisclosureTextBlock"
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xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
xlink:from="mrk_OtherIncomeExpenseNetAbstract"
xlink:to="us-gaap_OtherIncomeAndOtherExpenseDisclosureTextBlock_633621085156250000"
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<presentationLink xlink:type="extended"
xlink:role="http://merck.com/20090630/role/TaxesOnIncome"
xlink:title="0616 - Disclosure - Taxes on Income"> <loc
xlink:type="locator"
xlink:href="mrk-20090630.xsd#mrk_TaxesOnIncomeAbstract"
xlink:label="mrk_TaxesOnIncomeAbstract" /> <loc xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_IncomeTaxDisclosureTextBlock"
xlink:label="us-gaap_IncomeTaxDisclosureTextBlock_633621084854062500" /> <presentationArc
xlink:type="arc"
xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
xlink:from="mrk_TaxesOnIncomeAbstract"
xlink:to="us-gaap_IncomeTaxDisclosureTextBlock_633621084854062500"
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preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" /> </presentationLink>
<presentationLink xlink:type="extended"
xlink:role="http://merck.com/20090630/role/EarningsPerShare"
xlink:title="0617 - Disclosure - Earnings Per Share"> <loc
xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_EarningsPerShareAbstract"
xlink:label="us-gaap_EarningsPerShareAbstract" /> <loc
xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_EarningsPerShareTextBlock"
xlink:label="loc_EarningsPerShareTextBlock" /> <presentationArc
xlink:type="arc"
xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
xlink:from="us-gaap_EarningsPerShareAbstract"
xlink:to="loc_EarningsPerShareTextBlock" order="20" use="optional"
priority="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
</presentationLink> <presentationLink xlink:type="extended"
xlink:role="http://merck.com/20090630/role/SegmentReporting"
xlink:title="0618 - Disclosure - Segment Reporting"> <loc
xlink:type="locator"
xlink:href="mrk-20090630.xsd#mrk_SegmentReportingAbstract"
xlink:label="mrk_SegmentReportingAbstract" /> <loc xlink:type="locator"
xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SegmentReportingDisclosureTextBlock"
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xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
xlink:from="mrk_SegmentReportingAbstract"
xlink:to="us-gaap_SegmentReportingDisclosureTextBlock_633621083837343750"
order="20" use="optional" priority="2"
preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" /> </presentationLink>
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