<PAGE>

                                   FORM 10-Q/A
                               (AMENDED FORM 10-Q)

                       SECURITIES AND EXCHANGE COMMISSION

                              WASHINGTON, DC 20549

(X)  QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES
     EXCHANGE ACT OF 1934

For the quarterly period ended November 30, 1996
                               -----------------

          or

( )  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES
     EXCHANGE ACT OF 1934 for the transition period from ___________________ to
     ______________________.



Commission File Number:  0-12395


                               ALCIDE CORPORATION

          Delaware                                              22-2445061
-------------------------------                             --------------------
State or other jurisdiction of                               (I.R.S. Employer
incorporation or organization                               Identification No.)

8561 154th Avenue North East, Redmond WA                           98052
----------------------------------------                       --------------
   (Address of principal executive offices)                      (Zip Code)



Registrant's telephone number, including area code . . . . .    (206) 882-2555
                                                             -------------------

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15 (d) of the Securities Exchange Act of 1934
during the preceding 12 months (or for such shorter period that the registrant
was required to file such reports), and (2) has been subject to such filing
requirements for the past 90 days.

YES    X               NO
     -----                -----

Indicate the number of shares outstanding of each of the issuer's classes of
common stock, as of November 30, 1996:  2,601,071, net of Treasury Stock.
                                        ---------

<PAGE>

                                    PART II.

                                OTHER INFORMATION


ITEM 6.  EXHIBITS AND REPORTS ON FORM 8-K

EXHIBIT 10.20*

     Distributor Agreement by and between the Company and ABS Global, Inc.,
     dated October 30, 1996, covering the United States.

EXHIBIT 10.21*

     Distributor Agreement by and between the Company and ABS Global, Inc.,
     dated October 30, 1996, covering several international markets.

EXHIBIT 11

(a)  Computation of Earnings Per Common Share

<TABLE>
<CAPTION>

                                                           Three Months Ended             Six Months Ended
                                                           ------------------             ----------------
                                                              November 30,                  November 30,
                                                              ------------                  ------------

                                                                 1996         1995            1996           1995
                                                                 ----         ----            ----           ----
 <S>                                                        <C>          <C>             <C>            <C>
 Weighted average number of Common Shares outstanding       2,601,186    2,612,979       2,600,718      2,616,332

 Assuming exercise of options reduced by the number
 of shares which could have been purchased with the
 proceeds from exercise of such options                       192,616      236,056         192,616        236,056
                                                            ---------    ---------       ---------      ---------

 Weighted average Common Shares outstanding and             2,793,802    2,849,035       2,793,334      2,852,388
 Common Share equivalents                                   ---------    ---------       ---------      ---------
                                                            ---------    ---------       ---------      ---------

 Net Income per share                                            $.22         $.21            $.35           $.39
                                                            ---------    ---------       ---------      ---------
                                                            ---------    ---------       ---------      ---------
</TABLE>


REPORTS ON FORM 8-K

None.






* Confidential treatment has been requested for these Exhibits.


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