<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2015-02-21</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0000890465</issuerCik>
        <issuerName>NPS PHARMACEUTICALS INC</issuerName>
        <issuerTradingSymbol>NPSP</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001365343</rptOwnerCik>
            <rptOwnerName>Nader Francois</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>550 HILLS DRIVE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BEDMINSTER</rptOwnerCity>
            <rptOwnerState>NJ</rptOwnerState>
            <rptOwnerZipCode>07921</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>President, CEO and Director</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
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            </transactionDate>
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                <transactionCode>U</transactionCode>
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            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
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                </transactionShares>
                <transactionPricePerShare>
                    <value>46.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
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                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
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                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
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                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
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            </securityTitle>
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            </conversionOrExercisePrice>
            <transactionDate>
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            <transactionTimeliness>
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            </transactionTimeliness>
            <transactionAmounts>
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                </transactionShares>
                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
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            </transactionAmounts>
            <exerciseDate>
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            </exerciseDate>
            <expirationDate>
                <value>2024-02-12</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
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                </underlyingSecurityTitle>
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                </underlyingSecurityShares>
            </underlyingSecurity>
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                </directOrIndirectOwnership>
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        </derivativeTransaction>
        <derivativeTransaction>
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            </conversionOrExercisePrice>
            <transactionDate>
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            <transactionTimeliness>
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                </transactionShares>
                <transactionPricePerShare>
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                <transactionPricePerShare>
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                </underlyingSecurityTitle>
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                </underlyingSecurityShares>
            </underlyingSecurity>
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        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
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            </conversionOrExercisePrice>
            <transactionDate>
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            <transactionTimeliness>
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                </transactionShares>
                <transactionPricePerShare>
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            <expirationDate>
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        <derivativeTransaction>
            <securityTitle>
                <value>Stock Options</value>
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            <conversionOrExercisePrice>
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            <transactionTimeliness>
                <value></value>
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            <transactionAmounts>
                <transactionShares>
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                </transactionShares>
                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
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        </derivativeTransaction>
        <derivativeTransaction>
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                </transactionShares>
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            <exerciseDate>
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                <value></value>
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            <transactionAmounts>
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                <transactionPricePerShare>
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            <transactionTimeliness>
                <value></value>
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            <transactionAmounts>
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        <derivativeTransaction>
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            <transactionTimeliness>
                <value></value>
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            <transactionAmounts>
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                <transactionPricePerShare>
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                <value></value>
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            <transactionAmounts>
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                </transactionShares>
                <transactionPricePerShare>
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        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">In connection with the merger of Knight Newco 2, Inc. with and into NPS Pharmaceuticals, Inc. (the &quot;Issuer&quot;) on February 21, 2015, each outstanding stock option, whether vested or unvested, was cancelled in exchange for a single lump sum cash payment in an amount equal to the product of (1) the number of shares of the Issuer's common stock subject to such stock option and (2) the execess, if any, of $46.00 over the exercise price per share of such stock option.</footnote>
        <footnote id="F2">Each Restricted Stock Unit represents a contingent right to receive one share of the Issuer's common stock.</footnote>
        <footnote id="F3">On February 12, 2015, the Restricted Stock Units were granted with (i) one third vesting on the first anniversary of date of grant, (ii) one third on the second anniversary of date of grant and (iii) one third on the third anniversary of date of grant.</footnote>
        <footnote id="F4">In connection with the merger of Knight Newco 2, Inc. with and into the Issuer on February 21, 2015, each outstanding Restricted Stock Unit was cancelled in exchange for a lump sum cash payment in an amount equal to the product of (1) $46.00 and (2) the number of shares of common stock subject to such Restricted Stock Unit.</footnote>
        <footnote id="F5">On February 12, 2014, the Restricted Stock Units were granted with (i) one third vesting on the first anniversary of date of grant, (ii) one third on the second anniverary of date of grant and (iii) one third on the third anniverary of date of grant.</footnote>
        <footnote id="F6">On February 13, 2013, the Restricted Stock Units were granted with (i) one third vesting on the first anniversary of date of grant, (ii) one third on the second anniverary of date of grant and (iii) one third on the third anniverary of date of grant.</footnote>
        <footnote id="F7">Each performance unit represents a contingent right to receive one share of the Issuer's common stock.</footnote>
        <footnote id="F8">On February 12, 2014, the Performance Units were granted subject to vesting based on the satisfaction of certain performance criteria by the Issuer and/or the reporting person during the performance periods.</footnote>
        <footnote id="F9">In connection with the merger of Knight Newco 2, Inc. with and into the Issuer on February 21, 2015, each outstanding Performance Unit was cancelled in exchange for a lump sum cash payment in an amount equal to the product of (1) $46.00 and (2) the number of shares of common stock subject to such Performance Unit, which number was determined as if the applicable performance objectives had been achieved at the target performance level.</footnote>
        <footnote id="F10">On February 13, 2013, the Performance Units were granted subject to vesting based on the Issuer's satisfaction of certain performance criteria during the performance periods.</footnote>
        <footnote id="F11">On February 12, 2014, the stock options were granted with one fourth vesting on the first anniversary of date of grant and 6.25% vesting every three months thereafter.</footnote>
        <footnote id="F12">On February 13, 2013, the stock options were granted with one fourth vesting on the first anniversary of date of grant and 6.25% vesting every three months thereafter.</footnote>
        <footnote id="F13">On February 7, 2012, the stock options were granted with one fourth vesting on the first anniversary of date of grant and 6.25% vesting every three months thereafter.</footnote>
        <footnote id="F14">On February 17, 2011, the stock options were granted with one fourth vesting on the first anniversary of date of grant and 6.25% vesting every three months thereafter.</footnote>
        <footnote id="F15">On February 19, 2010, the stock options were granted with one fourth vesting on the first anniversary of date of grant and 6.25% vesting every three months thereafter.</footnote>
        <footnote id="F16">On February 12, 2010, the stock options were granted with one fourth vesting on the first anniversary of date of grant and 6.25% vesting every three months thereafter.</footnote>
        <footnote id="F17">On January 20, 2009, the stock options were granted with one fourth vesting on the first anniversary of date of grant and 6.25% vesting every three months thereafter.</footnote>
        <footnote id="F18">On January 20, 2009, the stock options were granted with one half vesting on the second anniversary of date of grant and one half vesting on the third anniversary of date of grant, with the actual number of options vesting on such dates determined based on specified performance criteria.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Francois Nader, by Jill Thompson as attorney-in-fact</signatureName>
        <signatureDate>2015-02-24</signatureDate>
    </ownerSignature>
</ownershipDocument>
