-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 Vw9o9XXdrSWu1l8KEy4v8JAnI6gWO3mij6qu01tDskmEUOy+w8qL4Mj6/5RdwpGv
 I7abg9zR5gnLsnn3Yrx3NA==

<SEC-DOCUMENT>0001209191-03-016065.txt : 20030807
<SEC-HEADER>0001209191-03-016065.hdr.sgml : 20030807
<ACCEPTANCE-DATETIME>20030807180045
ACCESSION NUMBER:		0001209191-03-016065
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030805
FILED AS OF DATE:		20030807

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			BIEN TIMOTHY E
		CENTRAL INDEX KEY:			0001224634

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-08269
		FILM NUMBER:		03829643

	BUSINESS ADDRESS:	
		STREET 1:		C/O OMNICARE INC
		STREET 2:		100 E RIVER CENTER BLVD 16TH FLOOR
		CITY:			COVINGTON
		STATE:			KY
		ZIP:			41011
		BUSINESS PHONE:		8593923317

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			OMNICARE INC
		CENTRAL INDEX KEY:			0000353230
		STANDARD INDUSTRIAL CLASSIFICATION:	RETAIL-DRUG STORES AND PROPRIETARY STORES [5912]
		IRS NUMBER:				311001351
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		100 E RIVERCENTER BLVD
		STREET 2:		STE 1600
		CITY:			COVINGTON
		STATE:			KY
		ZIP:			41101
		BUSINESS PHONE:		6063923300

	MAIL ADDRESS:	
		STREET 1:		100 E RIVERCENTER BLVD
		STREET 2:		STE 1600
		CITY:			COVINGTON
		STATE:			KY
		ZIP:			41101
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc4.xml
<DESCRIPTION>FORM 4 SUBMISSION
<TEXT>
<XML>
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    <schemaVersion>X0201</schemaVersion>

    <documentType>4</documentType><periodOfReport>2003-08-05</periodOfReport><notSubjectToSection16>0</notSubjectToSection16>
    <issuer>
        <issuerCik>0000353230</issuerCik>
        <issuerName>OMNICARE INC</issuerName>
        <issuerTradingSymbol>NYSE: OCR</issuerTradingSymbol></issuer><reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001224634</rptOwnerCik>
            <rptOwnerName>BIEN TIMOTHY E</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>100 E. RIVERCENTER BLVD., SUITE 1600</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>COVINGTON</rptOwnerCity>
            <rptOwnerState>KY</rptOwnerState>
            <rptOwnerZipCode>41011</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
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lue>2003-08-06</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>M</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionTimeliness><value></value></transactionTimeliness><transactionAmounts><transactionShares><value>22500</value></transactionShares><transactionPricePerShare><footnoteId id="F4" /></transactionPricePerShare><transactionAcquiredDisposedCode><value>D</value></transactionAcquiredDisposedCode></transactionAmounts><exerciseDate><footnoteId id="F4" /></exerciseDate><expirationDate><value>2010-07-15</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>22500</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>11250</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></dir
ectOrIndirectOwnership></ownershipNature></derivativeTransaction><derivativeTransaction><securityTitle><value>Option (Right to Buy)</value><footnoteId id="F5" /></securityTitle><conversionOrExercisePrice><value>19.83</value></conversionOrExercisePrice><transactionDate><value>2003-08-06</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>M</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionTimeliness><value></value></transactionTimeliness><transactionAmounts><transactionShares><value>16250</value></transactionShares><transactionPricePerShare><footnoteId id="F5" /></transactionPricePerShare><transactionAcquiredDisposedCode><value>D</value></transactionAcquiredDisposedCode></transactionAmounts><exerciseDate><footnoteId id="F5" /></exerciseDate><expirationDate><value>2011-11-07</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShar
es><value>16250</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>48750</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership></ownershipNature></derivativeTransaction><derivativeTransaction><securityTitle><value>Option (Right to Buy)</value><footnoteId id="F6" /></securityTitle><conversionOrExercisePrice><value>27.02</value></conversionOrExercisePrice><transactionDate><value>2003-08-06</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>M</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionTimeliness><value></value></transactionTimeliness><transactionAmounts><transactionShares><value>18000</value></transactionShares><transactionPricePerShare><footnoteId id="F6" /></transactionPricePerShare><transactionAcquiredDisposedCode><value>D</value></transaction
AcquiredDisposedCode></transactionAmounts><exerciseDate><footnoteId id="F6" /></exerciseDate><expirationDate><value>2012-05-20</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>18000</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>54000</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership></ownershipNature></derivativeTransaction></derivativeTable><footnotes><footnote id="F1">Includes 1,315 shares acquired in exempt transactions under the Omnicare Stock Plus Program (broad-based employee stock purchase/option plan).</footnote><footnote id="F2">Company Plan:  25% becomes exercisable on each anniversay date until fully exercisable on 3/21/2000.</footnote><footnote id="F3">Company Plan:  25% becomes exercisable on each anniversay date unti
l fully exercisable on 7/1/2003.</footnote><footnote id="F4">Company Plan:  25% becomes exercisable on each anniversay date until fully exercisable on 7/15/2004.</footnote><footnote id="F5">Company Plan:  25% becomes exercisable on each anniversay date until fully exercisable on 11/7/2005.</footnote><footnote id="F6">Company Plan:  25% becomes exercisable on each anniversay date until fully exercisable on 5/20/2006.</footnote></footnotes><remarks></remarks><ownerSignature><signatureName>TIMOTHY E. BIEN

/s/ Thomas Marsh, Attorney-in-fact for Timothy E. Bien (POA on file)</signatureName><signatureDate>2003-08-07</signatureDate></ownerSignature></ownershipDocument>

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</DOCUMENT>
</SEC-DOCUMENT>
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