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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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<SEC-DOCUMENT>0001181431-07-025378.txt : 20070413
<SEC-HEADER>0001181431-07-025378.hdr.sgml : 20070413
<ACCEPTANCE-DATETIME>20070413210344
ACCESSION NUMBER:		0001181431-07-025378
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20070413
FILED AS OF DATE:		20070413
DATE AS OF CHANGE:		20070413

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			PANACOS PHARMACEUTICALS, INC.
		CENTRAL INDEX KEY:			0001040017
		STANDARD INDUSTRIAL CLASSIFICATION:	BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
		IRS NUMBER:				113238476
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		134 COOLIDGE AVE
		CITY:			WATERTOWN
		STATE:			MA
		ZIP:			02472
		BUSINESS PHONE:		617-926-1551

	MAIL ADDRESS:	
		STREET 1:		134 COOLIDGE AVE
		CITY:			WATERTOWN
		STATE:			MA
		ZIP:			02472

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	V I TECHNOLOGIES INC
		DATE OF NAME CHANGE:	19980209

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			RICHARDS JOHN D
		CENTRAL INDEX KEY:			0001204790

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-24241
		FILM NUMBER:		07767033

	BUSINESS ADDRESS:	
		STREET 1:		C/O THE MEDICINES CO
		STREET 2:		8 CAMPUS DR
		CITY:			PARSIPPANY
		STATE:			NJ
		ZIP:			07054
		BUSINESS PHONE:		9736561616

	MAIL ADDRESS:	
		STREET 1:		THE MEDICINES CO
		STREET 2:		8 CAMPUS DR
		CITY:			PARSIPPANY
		STATE:			NJ
		ZIP:			07054
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>rrd154479.xml
<DESCRIPTION>FORM 3- J RICHARDS- 4/13/07
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2007-04-13</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001040017</issuerCik>
        <issuerName>PANACOS PHARMACEUTICALS, INC.</issuerName>
        <issuerTradingSymbol>PANC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001204790</rptOwnerCik>
            <rptOwnerName>RICHARDS JOHN D</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O PANACOS PHARMACEUTICALS, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>134 COOLIDGE AVENUE</rptOwnerStreet2>
            <rptOwnerCity>WATERTOWN</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02472</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>Exec. Officer- VP of Manufact.</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Right to Buy (Stock Option)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>8.12</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2006-03-13</value>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2016-02-13</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>200000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Right to Buy (Stock Option)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>4.03</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2007-02-24</value>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2017-01-24</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>75000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The options vest monthly at the rate of 1/48th per month, commencing one month following the date of grant.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ John D. Richards</signatureName>
        <signatureDate>2007-04-13</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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