<?xml version="1.0"?>
<ownershipDocument>
    <schemaVersion>X0201</schemaVersion>

    <documentType>4/A</documentType><periodOfReport>2003-09-30</periodOfReport><dateOfOriginalSubmission>2003-10-01</dateOfOriginalSubmission>
    <issuer>
        <issuerCik>0000722104</issuerCik>
        <issuerName>SAVIENT PHARMACEUTICALS INC</issuerName>
        <issuerTradingSymbol>SVNT</issuerTradingSymbol></issuer><reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001014156</rptOwnerCik>
            <rptOwnerName>WATTLETON FAYE</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>300 CENTRAL PARK WEST</rptOwnerStreet1>
            <rptOwnerStreet2>APT. 15H</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10024</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
<isDirector>1</isDirector><isOfficer>0</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>0</isOther></reportingOwnerRelationship></reportingOwner><nonDerivativeTable><nonDerivativeTransaction><securityTitle><value>Common stock, $.01 par value per share</value></securityTitle><transactionDate><value>2003-09-30</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>A</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionAmounts><transactionShares><value>495</value><footnoteId id="F1"/><footnoteId id="F3"/></transactionShares><transactionPricePerShare><value>5.05</value></transactionPricePerShare><transactionAcquiredDisposedCode><value>A</value></transactionAcquiredDisposedCode></transactionAmounts><postTransactionAmounts><sharesOwnedFollowingTransaction><value>3862</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></nonDerivativeTransaction></nonDerivativeTable><derivativeTable><derivativeTransaction><securityTitle><value>Options to purchase common stock, $.01 par value per share</value></securityTitle><conversionOrExercisePrice><value>5.05</value></conversionOrExercisePrice><transactionDate><value>2003-09-30</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>A</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionAmounts><transactionShares><value>5000</value><footnoteId id="F2"/></transactionShares><transactionPricePerShare><value>5.05</value></transactionPricePerShare><transactionAcquiredDisposedCode><value>A</value></transactionAcquiredDisposedCode></transactionAmounts><exerciseDate><value>2004-09-30</value></exerciseDate><expirationDate><value>2013-09-30</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common stock, $01 par value per share</value></underlyingSecurityTitle><underlyingSecurityShares><value>5000</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>85000</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeTransaction></derivativeTable><footnotes><footnote id="F1">These shares were granted pursuant to the Company's Stock Compensation Plan for Outside Directors, which provides for the grant to non-employee directors of that number of shares of Common Stock having an aggregate fair market value on the last business day of each quarter equal to $2,500, until he is no longer an Outside Director.  On September 30, 2003, the fair market value of the Common Stock, based on the closing price, was $5.05.</footnote><footnote id="F2">These options will become fully vested and immediately exercisable on 9/30/2004.</footnote><footnote id="F3">This stock grant was originally reported in Table 1 Columns 3 and 4 with the incorrect transaction codes.  The stock grant was originally reported in Column 3 as &quot;D&quot; instead of &quot;A&quot; and in Column 4 as &quot;D&quot; for securities disposed of instead of &quot;A&quot; for securities acquired.
</footnote></footnotes><remarks/><ownerSignature><signatureName>/s/ Faye Wattleton</signatureName><signatureDate>2004-01-14</signatureDate></ownerSignature></ownershipDocument>

