<?xml version="1.0"?>
<ownershipDocument>
    <schemaVersion>X0101</schemaVersion>

    <documentType>4</documentType>
    <periodOfReport>2003-07-21</periodOfReport>
    <notSubjectToSection16>0</notSubjectToSection16>
    <issuer>
        <issuerCik>0000005187</issuerCik>
        <issuerName>WYETH</issuerName>
        <issuerTradingSymbol>WYE</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001190323</rptOwnerCik>
            <rptOwnerName>FEERICK JOHN D</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>  </rptOwnerStreet1>
            <rptOwnerStreet2>  </rptOwnerStreet2>
            <rptOwnerCity>  </rptOwnerCity>
            <rptOwnerState>  </rptOwnerState>
            <rptOwnerZipCode>  </rptOwnerZipCode>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>
   <derivativeSecurity>
      <securityTitle>
          <value>Phantom Stock Units</value>
      </securityTitle>
      <conversionOrExercisePrice>
          <value>0.00</value>
      </conversionOrExercisePrice>
      <transactionDate>
          <value>2003-07-21</value>
      </transactionDate>
      <deemedExecutionDate>
          <value>2003-07-21</value>
      </deemedExecutionDate>
      <transactionCoding>
          <transactionFormType>4</transactionFormType>
          <transactionCode>A</transactionCode>
          <equitySwapInvolved>0</equitySwapInvolved>
      </transactionCoding>
      <transactionAmounts>
          <transactionShares>
              <value>236.41</value>
          </transactionShares>
          <transactionValue>
              <value>0</value>
          </transactionValue>
          <transactionAcquiredDisposedCode>
              <value>A</value>
          </transactionAcquiredDisposedCode>
      </transactionAmounts>
      <exerciseDate>
          <value>1988-08-08</value>
              <footnoteId id="F1" />
      </exerciseDate>
      <expirationDate>
          <value>1988-08-08</value>
              <footnoteId id="F2" />
      </expirationDate>
      <underlyingSecurity>
          <underlyingSecurityTitle>
              <value>Common Stock</value>
          </underlyingSecurityTitle>
          <underlyingSecurityShares>
              <value>236.41</value>
          </underlyingSecurityShares>
      </underlyingSecurity>
      <postTransactionAmounts>
          <sharesOwnedFollowingTransaction>
              <value>4734.85</value>
              <footnoteId id="F1" />
          </sharesOwnedFollowingTransaction>
      </postTransactionAmounts>
      <ownershipNature>
          <directOrIndirectOwnership>
              <value>D</value>
          </directOrIndirectOwnership>
      </ownershipNature>
   </derivativeSecurity>
<footnotes>
   <footnote id="F1">These units are allocated under the Wyeth Directors' Deferral Plan to the Reporting Person's deferred account on a quarterly basis upon the deferral of cash compensation due to the Reporting Person from the Issuer with interest accruing on amounts deferred until the next quarterly allocation date.  These units are payable only in cash and only upon termination of service as a director. The total number of units set forth under Item 9 as of the reporting date includes additional units allocated through </footnote>
   <footnote id="F2">The use of 08/08/1988 is a "dummy date" and is not a date related to these securities.</footnote>
</footnotes>
    <ownerSignature>
       <signatureName>John D. Feerick</signatureName>
       <signatureDate>2003-07-21</signatureDate>
    </ownerSignature>
    <ownerSignature>
       <signatureName>Garrett L. Stackman, Attorney-</signatureName>
       <signatureDate>2003-07-21</signatureDate>
    </ownerSignature>
</ownershipDocument>

