<PAGE>
UNITED STATES OMB Approval
-------------------------
SECURITIES AND EXCHANGE COMMISSION OMB Number: 3235-0145
Expires: October 31, 1997
Washington, D.C. 20549 Estimated average burden
hours per response..14.90
-------------------------
SCHEDULE 13G
Under the Securities Exchange Act of 1934
(Amendment No. 5)*
-
TheraTech, Inc.
- --------------------------------------------------------------------------------
(Name of Issuer)
Common Stock
- --------------------------------------------------------------------------------
(Title of Class of Securities)
883383101
- --------------------------------------------------------------------------------
(CUSIP Number)
*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.
The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).
Page 1 of 4
<PAGE>
SCHEDULE 13G
================================================================================
CUSIP NO 883383101 13G Page 2 of 4 Pages
================================================================================
================================================================================
1 NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
William I. Higuchi
2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
(a)___
Not applicable (b)___
3 SEC USE ONLY
4 CITIZENSHIP OR PLACE OF ORGANIZATION
U.S. Citizen
================================================================================
================================================================================
NUMBER OF 5 SOLE VOTING POWER
SHARES
BENEFICIALLY 2,328,534
OWNED BY
EACH 6 SHARED VOTING POWER
REPORTING
PERSON 4,500
WITH
7 SOLE DISPOSITIVE POWER
2,328,534
8 SHARED DISPOSITIVE POWER
4,500
================================================================================
================================================================================
9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
2,333,034
10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
Not applicable
11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11.1%
12 TYPE OF REPORTING PERSON*
IN
================================================================================
*SEE INSTRUCTION BEFORE FILLING OUT!
Page 2 of 4
<PAGE>
SCHEDULE 13G
ITEM 1. ISSUER
- --------------
(a) NAME OF ISSUER: TheraTech, Inc.
(b) ADDRESS OF ISSUER'S 417 Wakara Way
PRINCIPLE EXECUTIVE Salt Lake City, Utah 84108
OFFICES:
ITEM 2. REPORTING PERSON INFORMATION
- ------------------------------------
(a) NAME OF PERSON FILING: William I. Higuchi
---------------------
(b) ADDRESS OF PRINCIPAL BUSINESS OFFICE:
------------------------------------
417 Wakara Way
Salt Lake City, Utah 84108
(c) CITIZENSHIP:
-----------
United States of America
(d) TITLE OF CLASS OF SECURITIES:
----------------------------
Common Stock
(e) CUSIP NUMBER:
------------
883383101
ITEM 3. IF THIS STATEMENT IS FILED PURSUANT TO RULES 13D-1(b), OR 13D-2(b),
-------------------------------------------------------------------
CHECK WHETHER THE PERSON FILING IS A
------------------------------------
Not applicable
ITEM 4. OWNERSHIP
---------
(a) AMOUNT BENEFICIALLY OWNED:
2,333,034
(b) PERCENT OF CLASS:
11.1%
(c) NUMBER OF SHARES AS TO WHICH SUCH PERSON HAS:
(i) SOLE POWER TO VOTE OR TO DIRECT THE VOTE:
2,328,534 (which includes presently exercisable options to
purchase 34,000 shares)
(ii) SHARED POWER TO VOTE OR TO DIRECT THE VOTE:
4,500 which represents 4,500 shares owned by Setsuko
Higuchi (spouse)
Page 3 of 4
<PAGE>
SCHEDULE 13G
(iii) SOLE POWER TO DISPOSE OR TO DIRECT THE DISPOSITION OF:
2,328,534 (which includes presently exercisable options
to purchase 34,000 shares)
(iv) SHARED POWER TO DISPOSE OR TO DIRECT THE DISPOSITION OF:
4,500 which represents 4,500 shares owned by Setsuko
Higuchi (spouse)
ITEM 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS
--------------------------------------------
Not applicable
ITEM 6. OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON
---------------------------------------------------------------
Not applicable
ITEM 7. IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH
---------------------------------------------------------
ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING
-------------------------------------------------------------
COMPANY
-------
Not applicable
ITEM 8. IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP
---------------------------------------------------------
Not applicable
ITEM 9. NOTICE OF DISSOLUTION OF GROUP
------------------------------
Not applicable
ITEM 10. CERTIFICATION
-------------
Not applicable
SIGNATURE
---------
After reasonably inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.
Date: February 11, 1998
/s/William I Higuchi
--------------------
William I. Higuchi
Page 4 of 4
