Exhibit 10(k) Amendment #10 to Loan Agreement Dated December 31, 1999

                                Exhibit 10(k)
                       Amendment #10 to Loan Agreement
                           Dated December 31, 1999



                                Xxxxxxx Xxxxxx
                                00000 Xxxxxxx
                           Xxxxxxxx, Xxxxxxxx 00000


                              December 31, 1999


Xx. Xxxxx Xxxxxxxxxx
Lannett Company, Inc.
0000 Xxxxx Xxxx
Xxxxxxxxxxxx, Xxxxxxxxxxxx 00000

         Re: Loan Agreement between Xxxxxxx Xxxxxx ("Lender") and Lannett
Company, Inc., a Delaware Corporation ("Borrower") dated August 30, 1991, as
amended by Amendment #1 to Loan Agreement dated as of March 15, 1993, and by
letter agreements dated August 1, 1994, May 15, 1995, December 31, 1995, June
30, 1996, November 1, 1996, September 9, 1997, June 30, 1998, December 30,
1998 and December 31, 1999.

Dear Xxxxx:

This letter confirms that the Maturity Date for the Revolving Credit Loan (as
defined in the Loan Agreement) is extended to October 1, 2001.



                               Very Truly Yours

                            By: /s/ Xxxxxxx Xxxxxx
                                Xxxxxxx Xxxxxx



AGREED TO AND ACCEPTED:

LANNETT COMPANY, INC.


By:/s/ Xxxxx Xxxxxxxxx
       ---------------
       Xxxxx Xxxxxxxxxx, Chief Operating Officer