EXHIBIT 5.1


                                HALE AND DORR LLP
                               COUNSELLORS AT LAW
                  60 State Street, Boston, Massachusetts 02109
                         617-526-6000 * FAX 617-526-5000


                                October 25, 2002


PolyMedica Corporation
11 State Street
Woburn, MA  01801

         Re:    Registration Statement on Form S-8
                ----------------------------------

Ladies and Gentlemen:

         We have assisted in the preparation of a Registration Statement on Form
S-8 (the "Registration Statement") to be filed with the Securities and Exchange
Commission under the Securities Act of 1933, as amended (the "Securities Act"),
relating to an aggregate of 500,000 shares of Common Stock, par value $0.01 per
share (the "Shares"), of PolyMedica Corporation, a Massachusetts corporation
(the "Company"), issuable under the Company's 2000 Stock Incentive Plan (the
"Plan").

         We have examined the Certificate of Incorporation and By-Laws of the
Company, each as amended and restated to date and originals, or copies certified
to our satisfaction, of all pertinent records of the meetings of the directors
and stockholders of the Company, the Registration Statement and such other
documents relating to the Company as we have deemed material for the purposes of
this opinion.

         In our examination of the foregoing documents, we have assumed the
genuineness of all signatures, the authenticity of all documents submitted to us
as originals, the conformity to original documents of all documents submitted to
us as copies, the authenticity of the originals of such latter documents and the
legal competence of all signatories to such documents.

         We assume that the appropriate action will be taken, prior to the offer
and sale of the Shares in accordance with the Plan, to register and qualify the
Shares for sale under all applicable state securities or "blue sky" laws. We
express no opinion herein as to the laws of any state or jurisdiction other than
the state laws of The Commonwealth of Massachusetts and the federal laws of the
United States of America.

         It is understood that this opinion is to be used only in connection
with the offer and sale of the Shares while the Registration Statement is in
effect.


         Please note that we are opining only as to the matters expressly set
forth herein, and no opinion should be inferred as to any other matters. This
opinion is based upon currently existing statutes, rules, regulations and
judicial decisions, and we disclaim any obligation to advise you of any change
in any of these sources of law or subsequent legal or factual developments which
might affect any matters or opinions set forth herein.

         Based upon the foregoing, we are of the opinion that the Company has
duly authorized for issuance the Shares covered by the Registration Statement to
be issued under the Plan, as described in the Registration Statement, and such
Shares, when issued in accordance with the terms of the Plan, will be legally
issued, fully paid and nonassessable.

         We hereby consent to the filing of this opinion with the Commission as
an exhibit to the Registration Statement in accordance with the requirements of
Item 601(b)(5) of Regulation S-K under the Securities Act. In giving such
consent, we do not hereby admit that we are in the category of persons whose
consent is required under Section 7 of the Securities Act or the rules and
regulations of the Securities and Exchange Commission.


                                             Very truly yours,

                                             /s/ Hale and Dorr LLP

                                             HALE AND DORR LLP


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