<?xml version="1.0"?><ownershipDocument><schemaVersion>X0201</schemaVersion>    <documentType>4</documentType><periodOfReport>2003-09-11</periodOfReport><notSubjectToSection16>0</notSubjectToSection16><issuer><issuerCik>0000010081</issuerCik><issuerName>BARR LABORATORIES INC</issuerName>        <issuerTradingSymbol>brl</issuerTradingSymbol></issuer><reportingOwner><reportingOwnerId><rptOwnerCik>0001237255</rptOwnerCik><rptOwnerName>CATLETT TIMOTHY</rptOwnerName></reportingOwnerId><reportingOwnerAddress><rptOwnerStreet1>BARR LABORATORIES, INC.</rptOwnerStreet1><rptOwnerStreet2>400 CHESTNUT RIDGE ROAD</rptOwnerStreet2><rptOwnerCity>WOODCLIFF LAKE</rptOwnerCity><rptOwnerState>NJ</rptOwnerState><rptOwnerZipCode>07677</rptOwnerZipCode><rptOwnerStateDescription></rptOwnerStateDescription></reportingOwnerAddress><reportingOwnerRelationship><isDirector>0</isDirector><isOfficer>1</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>0</isOther><officerTitle>Sr.VP, Sales &amp; Marketing</officerTitle></reportingOwnerRelationship></reportingOwner><nonDerivativeTable><nonDerivativeTransaction><securityTitle><value>Common Stock</value></securityTitle><transactionDate><value>2003-09-11</value></transactionDate><deemedExecutionDate></deemedExecutionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>D</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionTimeliness><value></value></transactionTimeliness><transactionAmounts><transactionShares><value>295.5</value></transactionShares><transactionPricePerShare><value>72.86</value></transactionPricePerShare><transactionAcquiredDisposedCode><value>D</value></transactionAcquiredDisposedCode></transactionAmounts><postTransactionAmounts><sharesOwnedFollowingTransaction><value>893.3</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership></ownershipNature></nonDerivativeTransaction></nonDerivativeTable><footnotes></footnotes><remarks></remarks><ownerSignature><signatureName>William T. McKee, as attorney-in-fact for Timothy Catlett</signatureName><signatureDate>2003-09-11</signatureDate></ownerSignature></ownershipDocument>

