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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2013-06-28</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000786947</issuerCik>
        <issuerName>ACURA PHARMACEUTICALS, INC</issuerName>
        <issuerTradingSymbol>ACUR</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001212648</rptOwnerCik>
            <rptOwnerName>CARE CAPITAL  II  LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>47 HULFISH STREET</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 310</rptOwnerStreet2>
            <rptOwnerCity>PRINCETON</rptOwnerCity>
            <rptOwnerState>NJ</rptOwnerState>
            <rptOwnerZipCode>08542</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001223011</rptOwnerCik>
            <rptOwnerName>CARE CAPITAL INVESTMENTS II LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>47 HULFISH STREET</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 310</rptOwnerStreet2>
            <rptOwnerCity>PRINCETON</rptOwnerCity>
            <rptOwnerState>NJ</rptOwnerState>
            <rptOwnerZipCode>08542</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001357403</rptOwnerCik>
            <rptOwnerName>Care Capital Offshore Investments II LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>47 HULFISH STREET</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 310</rptOwnerStreet2>
            <rptOwnerCity>PRINCETON</rptOwnerCity>
            <rptOwnerState>NJ</rptOwnerState>
            <rptOwnerZipCode>08542</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2013-07-01</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>500000</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>2.36</value>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>4441833</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2013-07-02</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>81082</value>
                    <footnoteId id="F4"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>2.04</value>
                    <footnoteId id="F5"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>4360751</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F6"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">The shares were sold as follows: 467,900 by Care Capital Investments II, LP and 32,100 by Care Capital Offshore Investments II, L.P.</footnote>
        <footnote id="F2">The price reported in Column 4 is a weighted average price.  These shares were sold in multiple transactions at prices ranging from $2.58 to $2.15, inclusive.</footnote>
        <footnote id="F3">Consists of 4,156,677 shares held by Care Capital Investments II, LP and 285,156 shares held by Care Capital Offshore Investments II, L.P.  Care Capital II, LLC is the general partner of Care Capital Investments II, LP and Care Capital Offshore Investments II, LP and as a result, Care Capital II, LLC has the ultimate power to vote or direct the vote and to dispose or direct the disposition of such shares.  Care Capital II, LLC is managed by three or more members and accordingly none of the managing members is deemed to have voting or dispositive control over the securities.</footnote>
        <footnote id="F4">The shares were sold as follows: 75,876 by Care Capital Investments II, LP and 5,206 by Care Capital Offshore Investments II, L.P.</footnote>
        <footnote id="F5">The price reported in Column 4 is a weighted average price.  These shares were sold in multiple transactions at prices ranging from $2.25 to $2.00, inclusive.</footnote>
        <footnote id="F6">Consists of 4,080,801 shares held by Care Capital Investments II, LP and 279,950 shares held by Care Capital Offshore Investments II, L.P.  Care Capital II, LLC is the general partner of Care Capital Investments II, LP and Care Capital Offshore Investments II, LP and as a result, Care Capital II, LLC has the ultimate power to vote or direct the vote and to dispose or direct the disposition of such shares.  Care Capital II, LLC is managed by three or more members and accordingly none of the managing members is deemed to have voting or dispositive control over the securities.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Care Capital LLC /s/ David R. Ramsay</signatureName>
        <signatureDate>2013-07-03</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Care Capital Investments II, LP, By: Care Capital II, LLC, Its General Partner /s/ David R. Ramsay</signatureName>
        <signatureDate>2013-07-03</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Care Capital Offshore Investments II, LP, By: Care Capital II, LLC, Its General Partner /s/ David R. Ramsay</signatureName>
        <signatureDate>2013-07-03</signatureDate>
    </ownerSignature>
</ownershipDocument>
