-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 GKgHV/fCBYqi0fJVCTaGcbxf3zi+y/Y6+Rhe2stXl+WDYKqq/QFxuzlvN/KqJVlP
 KIGutxznj0NXKe0AfyMjmg==

<SEC-DOCUMENT>0001209191-03-022347.txt : 20030922
<SEC-HEADER>0001209191-03-022347.hdr.sgml : 20030922
<ACCEPTANCE-DATETIME>20030922113229
ACCESSION NUMBER:		0001209191-03-022347
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030919
FILED AS OF DATE:		20030922

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			LANNETT CO INC
		CENTRAL INDEX KEY:			0000057725
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				230787699
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0630

	BUSINESS ADDRESS:	
		STREET 1:		9000 STATE RD
		CITY:			PHILADELPHIA
		STATE:			PA
		ZIP:			19136
		BUSINESS PHONE:		2153339000

	MAIL ADDRESS:	
		STREET 1:		9000 STATE ROAD
		STREET 2:		9000 STATE ROAD
		CITY:			PHLADELPHIA
		STATE:			PA
		ZIP:			19136

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	NETHERLANDS SECURITIES INC
		DATE OF NAME CHANGE:	19660629

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			FARBER WILLIAM
		CENTRAL INDEX KEY:			0001255689

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-31298
		FILM NUMBER:		03903662

	BUSINESS ADDRESS:	
		STREET 1:		32640 WHATLEY ROAD
		CITY:			FRANKLIN
		STATE:			MI
		ZIP:			48025
		BUSINESS PHONE:		2488510747

	MAIL ADDRESS:	
		STREET 1:		32640 WHATLEY ROAD
		CITY:			FRANKLIN
		STATE:			MI
		ZIP:			48025
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc4.xml
<DESCRIPTION>FORM 4 SUBMISSION
<TEXT>
<XML>
<?xml version="1.0"?><ownershipDocument><schemaVersion>X0201</schemaVersion>    <documentType>4</documentType><periodOfReport>2003-09-19</periodOfReport><notSubjectToSection16>0</notSubjectToSection16><issuer><issuerCik>0000057725</issuerCik><issuerName>LANNETT CO INC</issuerName>        <issuerTradingSymbol>LCI</issuerTradingSymbol></issuer><reportingOwner><reportingOwnerId><rptOwnerCik>0001255689</rptOwnerCik><rptOwnerName>FARBER WILLIAM</rptOwnerName></reportingOwnerId><reportingOwnerAddress><rptOwnerStreet1>32640 WHATLEY ROAD</rptOwnerStreet1><rptOwnerStreet2></rptOwnerStreet2><rptOwnerCity>FRANKLIN</rptOwnerCity><rptOwnerState>MI</rptOwnerState><rptOwnerZipCode>48025</rptOwnerZipCode><rptOwnerStateDescription></rptOwnerStateDescription></reportingOwnerAddress><reportingOwnerRelationship><isDirector>1</isDirector><isOfficer>1</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>0</isOther><officerTitle>Chief Executive Officer</officerTitle></reportingOwnerRelationship></reportingOwner><nonDerivati
veTable><nonDerivativeTransaction><securityTitle><value>Common Stock</value></securityTitle><transactionDate><value>2003-09-19</value></transactionDate><deemedExecutionDate></deemedExecutionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>S</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionTimeliness><value></value></transactionTimeliness><transactionAmounts><transactionShares><value>4100</value></transactionShares><transactionPricePerShare><value>20.0227</value></transactionPricePerShare><transactionAcquiredDisposedCode><value>D</value></transactionAcquiredDisposedCode></transactionAmounts><postTransactionAmounts><sharesOwnedFollowingTransaction><value>13546879</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership></ownershipNature></nonDerivativeTransaction></nonDerivativeTable><footnotes></footnotes><remarks></remarks><ownerSignatu
re><signatureName>Larry Dalesandro</signatureName><signatureDate>2003-09-22</signatureDate></ownerSignature></ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----