UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 8-K

                                 CURRENT REPORT
     Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

        Date of Report (date of earliest event reported): April 27, 2005

                             CARRIZO OIL & GAS, INC.
             (Exact name of registrant as specified in its charter)

        Texas                       000-22915                  76-0415919
     (State or other               (Commission             (I.R.S. Employer
     jurisdiction of               File Number)           Identification No.)
      incorporation)


           1000 Louisiana Street
                 Suite 1500
               Houston, Texas                                     77002
   (Address of principal executive offices)                     (Zip code)

       Registrant's telephone number, including area code: (713) 328-1000


                                       N/A
         (Former name or former address, if changed since last report.)

Check  the  appropriate  box  below  if the  Form  8-K  filing  is  intended  to
simultaneously  satisfy the filing obligation of the registrant under any of the
following provisions:

[ ] Written communications pursuant to Rule 425 under the Securities Act (17 CFR
230.425)
[ ] Soliciting  material  pursuant to Rule 14a-12 under the Exchange Act (17 CFR
240.14a-12)
[ ] Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange
Act (17 CFR 240.14d-2(b))
[ ] Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange
Act (17 CFR 240.13e-4(c))




Item 1.01.        ENTRY INTO A MATERIAL DEFINITIVE AGREEMENT.

     On April 27, 2005,  Carrizo Oil & Gas,  Inc.  (the  "Company")  amended its
senior  credit  facility,  which  provides the Company with a revolving  line of
credit of up to $75.0  million and a term loan  facility of up to $25.0  million
(the "Senior Credit  Facility"),  pursuant to the Second Amendment to the Second
Amended  and  Restated  Credit  Agreement  dated as of April 27,  2005 among the
Company,  CCBM, Inc., Hibernia National Bank and Union Bank of California,  N.A.
(the "Credit Facility  Amendment").  Such amendment includes without limitation:
(1)  the  restatement  of  the  covenant  regarding  maintenance  of  a  minimum
shareholders' equity such that it requires a minimum equal to $108,773,000, plus
100% of all subsequent common and preferred equity  contributed by the Company's
shareholders  subsequent to December 31, 2004, plus 50% of all positive earnings
occurring  subsequent to December 31, 2004,  and (2) the addition of a provision
restricting  loans from the Company to  subsidiaries or guarantors of the Senior
Credit  Facility if the  proceeds of such loans will be invested in an entity in
which the Company holds an equity interest.

     The foregoing description of the Credit Facility Amendment does not purport
to be complete and is qualified by reference to the complete document,  which is
attached  to this  Current  Report  as an  exhibit  and  incorporated  herein by
reference.

Item 9.01.        FINANCIAL STATEMENTS AND EXHIBITS.

(c) Exhibits.


             EXHIBIT NUMBER                    DESCRIPTION
             --------------                    -----------
                                            
             10.1                              Second  Amendment  to Second  Amended and  Restated  Credit
                                               Agreement  dated as of April 27, 2005 by and among  Carrizo
                                               Oil & Gas, Inc.,  CCBM,  Inc.,  Hibernia  National Bank, as
                                               Agent,  Union Bank of  California,  N.A., as co-agent,  and
                                               Hibernia National Bank and Union Bank of California,  N.A.,
                                               as lenders.






                                   SIGNATURES



     Pursuant to the  requirements  of the Securities  Exchange Act of 1934, the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned hereunto duly authorized.


                                      CARRIZO OIL & GAS, INC.


                                      By: /s/ Paul F. Boling
                                          ------------------ 
                                      Name:  Paul F. Boling
                                      Title: Vice President and 
                                             Chief Financial Officer

Date:  May 3, 2005





                                INDEX TO EXHIBITS


10.1                 Second  Amendment  to Second  Amended and  Restated  Credit
                     Agreement  dated as of April 27, 2005 by and among  Carrizo
                     Oil & Gas, Inc.,  CCBM,  Inc.,  Hibernia  National Bank, as
                     Agent,  Union Bank of  California,  N.A., as co-agent,  and
                     Hibernia National Bank and Union Bank of California,  N.A.,
                     as lenders.