THIS DOCUMENT IS IMPORTANT AND REQUIRES YOUR IMMEDIATE ATTENTION. If you are in any doubt about what action to take, you should seek financial advice from your own appropriately authorized independent financial advisor. If you have sold or transferred all of your registered holdings of American Depositary Shares of Laboratorio Chile S.A., please forward this document and all accompanying documents to the stockbroker, bank or other agent through or to whom the sale or transfer was effected, for transmission to the purchaser or transferee. ADS NOTICE OF GUARANTEED DELIVERY for Tender of American Depositary Shares ("ADSs") (Evidenced by American Depositary Receipts) of LABORATORIO CHILE S.A. Pursuant to the U.S. Offer to Purchase dated July 31, 2001 by IVAX HOLDINGS C.I. a wholly-owned subsidiary of IVAX CORPORATION As set forth under "Section 4. Procedure for Accepting the U.S. Offer-- Holders of Remaining ADSs" in the U.S. Offer to Purchase dated July 31, 2001, this ADS Notice of Guaranteed Delivery or one substantially equivalent hereto (this "Form") must be used to tender ADSs pursuant to the U.S. Offer if the ADRs evidencing such ADSs are not immediately available or if the procedures for book-entry transfer cannot be completed on a timely basis or time will not permit all required documents to reach the Receiving Agent prior to the termination of the U.S. Offer. This Form, properly completed and duly executed (including the signature guarantee by an Eligible Institution in the form set forth hereinafter) may be delivered by hand or mail to the Receiving Agent. Capitalized terms used herein and not otherwise defined herein shall have the meanings assigned to them in the U.S. Offer to Purchase. The Receiving Agent for the U.S. Offer is: THE BANK OF NEW YORK By Hand or Overnight By Mail: Facsimile Transmission: Courier: (For Eligible Institutions The Bank of New York Only) The Bank of New York Tender & Exchange Department (212) 815-6213 Tender & Exchange Department P.O. Box 11248 101 Barclay Street Church Street Station Receive and Deliver Window Fax Confirmation Only New York, NY 10286-1248 Telephone: New York, NY 10286 (212) 815-6156 Delivery of this Form to an address other than as set forth above does not constitute a valid delivery. This Form is not to be used to guarantee signatures other than for the purposes described in this Form. If a signature on an ADS Letter of Transmittal is required to be guaranteed by an Eligible Institution under the instructions thereto, such signature guarantee must appear in the applicable space provided in the signature box on such ADS Letter of Transmittal. In the case of ADSs held through the Book-Entry Transfer Facility (as defined in Section 4 of the U.S. Offer to Purchase), the ADS Notice of Guaranteed Delivery may be delivered to the Receiving Agent by a participant in the Book-Entry Transfer Facility via the book-entry confirmation system. Shares of Laboratorio Chile S.A. may not be tendered by means of this Form. Ladies and Gentlemen: The undersigned hereby tenders to IVAX Holdings C.I. (the "Purchaser"), a wholly-owned subsidiary of IVAX Corporation, the ADSs indicated below upon the terms and subject to the conditions set forth below and pursuant to the Guaranteed Delivery Procedures described in the U.S. Offer to Purchase under "Section 4. Procedure for Accepting the U.S. Offer--Holders of Remaining ADSs." Number of ADSs: _____________________ Name(s) of Record Holder(s): ________ ADR No(s). (if available): __________ _____________________________________ _____________________________________ _____________________________________ _____________________________________ Address: ____________________________ If ADSs will be tendered by book- _____________________________________ entry transfer: _____________________________________ Account Number: _____________________ Transaction Code Number: ____________ Area Code and Tel No.: ______________ Signature(s): _______________________ _____________________________________ _____________________________________ Dated: ______________________________ (please type or print) GUARANTEE The undersigned, a financial institution which is a participant in the Securities Transfer Agents Medallion Program, the New York Stock Exchange Medallion Program or the Stock Exchange Medallion Program (an "Eligible Institution"), hereby guarantees that the undersigned will deliver to the Receiving Agent the ADRs representing the ADSs tendered hereby, in proper form for transfer, or confirmation of the book-entry transfer of such ADSs into the Receiving Agent's account at the Book-Entry Transfer Facility, together with a properly completed and duly executed ADS Letter of Transmittal or, in the case of a book-entry transfer, an Agent's Message (as defined in the U.S. Offer to Purchase), with any required signature guarantees and any other required documents, all within three NYSE trading days after the date hereof. _____________________________________ _____________________________________ (Name of Firm Agent or Trustee) (Authorized Signature) _____________________________________ Name: _______________________________ (Address) (Please Type or Print) _____________________________________ Title: ______________________________ (Zip Code) Dated: ______________________________ Area Code and Tel No.: ______________ NOTE: DO NOT SEND SECURITIES WITH THIS FORM; SECURITIES SHOULD BE SENT WITH YOUR ADS LETTER OF TRANSMITTAL. 2