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                                                                    EXHIBIT 5.01

                            SMITH, ANDERSON, BLOUNT,
                      DORSETT, MITCHELL & JERNIGAN, L.L.P.


           OFFICES                                           MAILING ADDRESS
2500 FIRST UNION CAPITOL CENTER                               P.O. BOX 2611
 RALEIGH, NORTH CAROLINA 27601                           RALEIGH, NORTH CAROLINA
                                                                27602-2611
                                February 17, 1999
                                                       TELEPHONE: (919) 821-1220
                                                       FACSIMILE: (919) 821-6800


 

Quintiles Transnational Corp.
4709 Creekstone Drive
Riverbirch Building, Suite 200
Durham, North Carolina 27703-8411

         RE:  REGISTRATION STATEMENT ON FORM S-4

Ladies and Gentlemen:

         We are counsel for Quintiles Transnational Corp. (the "Company") in
connection with the issuance by the Company of up to 30,717,729 shares of the
Company's Common Stock, $0.01 par value per share to be issued in exchange for
the shares of Common Stock and Series B Convertible Preferred Stock of ENVOY
Corporation ("ENVOY") outstanding as of the effective date of the merger of QELS
Corp., a Tennessee corporation which has not engaged in any material operations
since its incorporation and is a wholly owned subsidiary of the Company, with
and into ENVOY (the "Merger"). These shares are described in the Company's
Registration Statement on Form S-4 to be filed with the Securities and Exchange
Commission (the "Commission") under the Securities Act of 1933, as amended (the
"Act"), on February 17, 1999, with which this opinion will be filed as an
exhibit (the "Registration Statement"). This opinion is furnished pursuant to
the requirement of Item 601(b)(5) of Regulation S-K under the Act.

         We have examined the Amended and Restated Articles of Incorporation, as
amended, and the Amended and Restated Bylaws of the Company, the minutes of the
meetings of the Board of Directors of the Company relating to the authorization
and the issuance of securities and such other documents, records, and matters of
law as we have deemed necessary for purposes of this opinion. In our
examination, we have assumed the genuineness of all signatures, the authenticity
of all documents as originals, the conformity to originals of all documents
submitted to us as certified copies or photocopies, and the authenticity of the
originals of such latter documents. In rendering the opinion set forth below, we
have relied on a certificate of a Company officer, whom we believe is
responsible.

         Based upon the foregoing and the additional qualifications set forth
below, it is our opinion, as of the date hereof, that the 30,717,729 shares of
Common Stock of the Company which are being registered pursuant to the
Registration Statement are duly authorized and, when 


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issued and delivered in exchange for the shares of ENVOY Common Stock and Series
B Convertible Preferred Stock surrendered in the Merger, as contemplated by the
Registration Statement, such shares will be validly issued, fully paid and
nonassessable.

         The opinion expressed herein does not extend to compliance with state
and federal securities laws relating to the sale of these securities.

         We hereby consent to the reference to our firm under the heading "Legal
Matters" in the Registration Statement and to the filing of this opinion as an
exhibit to the Registration Statement. Such consent shall not be deemed to be an
admission that this firm is within the category of persons whose consent is
required under Section 7 of the Act, or the regulations promulgated by the
Commission pursuant to such Act.

         This opinion is limited to the laws of the State of North Carolina, and
no opinion is expressed as to the laws of any other jurisdiction.

         Our opinion is as of the date hereof, and we do not undertake to advise
you of matters that might come to our attention subsequent to the date hereof
which may affect our legal opinion expressed herein.


                                          Sincerely yours,



                                          /s/ SMITH, ANDERSON, BLOUNT, DORSETT,
                                              MITCHELL & JERNIGAN, L.L.P.