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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934
(Amendment No. 2)*

MYOGEN, INC.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

62856E 10 4

(CUSIP Number)

December 31, 2005

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

o Rule 13d-1(b)

o Rule 13d-1(c)

þ Rule 13d-1(d)

* 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).

Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.


CUSIP No.		62856E 10 4		Page		2		of		26 Pages


1	NAMES OF REPORTING PERSONS: InterWest Partners VI, LP

	I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):


2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
	(a) o
	(b) o

3	SEC USE ONLY:



4	CITIZENSHIP OR PLACE OF ORGANIZATION:

	California

		5	SOLE VOTING POWER:

NUMBER OF			293,488

SHARES		6	SHARED VOTING POWER:
BENEFICIALLY
OWNED BY			0

EACH		7	SOLE DISPOSITIVE POWER:
REPORTING
PERSON			293,488

WITH:		8	SHARED DISPOSITIVE POWER:

			0

9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:

	293,488

10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):

	o

11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):

	0.7%

12	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):

	PN

Page 2 of 26 Pages


CUSIP No.		62856E 10 4		Page		3		of		26 Pages


1	NAMES OF REPORTING PERSONS: InterWest Investors VI, LP

	I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):


2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
	(a) o
	(b) o

3	SEC USE ONLY:



4	CITIZENSHIP OR PLACE OF ORGANIZATION:

	California

		5	SOLE VOTING POWER:

NUMBER OF			9,207

SHARES		6	SHARED VOTING POWER:
BENEFICIALLY
OWNED BY			0

EACH		7	SOLE DISPOSITIVE POWER:
REPORTING
PERSON			9,207

WITH:		8	SHARED DISPOSITIVE POWER:

			0

9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:

	9,207

10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):

	o

11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):

	Less than 0.1%

12	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):

	PN

Page 3 of 26 Pages


CUSIP No.		62856E 10 4		Page		4		of		26 Pages


1	NAMES OF REPORTING PERSONS: InterWest Management Partners VI, LLC (the General Partner of InterWest Partners VI, LP and InterWest Investors VI, LP)

	I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):


2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
	(a) o
	(b) o

3	SEC USE ONLY:



4	CITIZENSHIP OR PLACE OF ORGANIZATION:

	California

		5	SOLE VOTING POWER:

NUMBER OF			302,695

SHARES		6	SHARED VOTING POWER:
BENEFICIALLY
OWNED BY			0

EACH		7	SOLE DISPOSITIVE POWER:
REPORTING
PERSON			302,695

WITH:		8	SHARED DISPOSITIVE POWER:

			0

9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:

	302,695

10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):

	o

11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):

	0.7%

12	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):

	OO

Page 4 of 26 Pages


CUSIP No.		62856E 10 4		Page		5		of		26 Pages


1	NAMES OF REPORTING PERSONS: InterWest Partners VIII, LP

	I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):


2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
	(a) o
	(b) o

3	SEC USE ONLY:



4	CITIZENSHIP OR PLACE OF ORGANIZATION:

	California

		5	SOLE VOTING POWER:

NUMBER OF			611,474

SHARES		6	SHARED VOTING POWER:
BENEFICIALLY
OWNED BY			0

EACH		7	SOLE DISPOSITIVE POWER:
REPORTING
PERSON			611,474

WITH:		8	SHARED DISPOSITIVE POWER:

			0

9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:

	611,474

10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):

	o

11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):

	1.5%

12	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):

	PN

Page 5 of 26 Pages


CUSIP No.		62856E 10 4		Page		6		of		26 Pages


1	NAMES OF REPORTING PERSONS: InterWest Investors VIII, LP

	I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):


2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
	(a) o
	(b) o

3	SEC USE ONLY:



4	CITIZENSHIP OR PLACE OF ORGANIZATION:

	California

		5	SOLE VOTING POWER:

NUMBER OF			4,861

SHARES		6	SHARED VOTING POWER:
BENEFICIALLY
OWNED BY			0

EACH		7	SOLE DISPOSITIVE POWER:
REPORTING
PERSON			4,861

WITH:		8	SHARED DISPOSITIVE POWER:

			0

9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:

	4,861

10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):

	o

11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):

	Less than 0.1%

12	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):

	PN

Page 6 of 26 Pages


CUSIP No.		62856E 10 4		Page		7		of		26 Pages


1	NAMES OF REPORTING PERSONS: InterWest Investors Q VIII, LP

	I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):


2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
	(a) o
	(b) o

3	SEC USE ONLY:



4	CITIZENSHIP OR PLACE OF ORGANIZATION:

	California

		5	SOLE VOTING POWER:

NUMBER OF			17,491

SHARES		6	SHARED VOTING POWER:
BENEFICIALLY
OWNED BY			0

EACH		7	SOLE DISPOSITIVE POWER:
REPORTING
PERSON			17,491

WITH:		8	SHARED DISPOSITIVE POWER:

			0

9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:

	17,491

10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):

	o

11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):

	Less than 0.1%

12	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):

	PN

Page 7 of 26 Pages


CUSIP No.		62856E 10 4		Page		8		of		26 Pages


1	NAMES OF REPORTING PERSONS: InterWest Management Partners VIII, LLC (the General Partner of InterWest Partners VIII, LP, InterWest Investors VIII, LP, and InterWest Investors Q VIII, LP)

	I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):


2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
	(a) o
	(b) o

3	SEC USE ONLY:



4	CITIZENSHIP OR PLACE OF ORGANIZATION:

	California

		5	SOLE VOTING POWER:

NUMBER OF			633,826

SHARES		6	SHARED VOTING POWER:
BENEFICIALLY
OWNED BY			0

EACH		7	SOLE DISPOSITIVE POWER:
REPORTING
PERSON			633,826

WITH:		8	SHARED DISPOSITIVE POWER:

			0

9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:

	633,826

10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):

	o

11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):

	1.5%

12	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):

	OO

Page 8 of 26 Pages


CUSIP No.		62856E 10 4		Page		9		of		26 Pages


1	NAMES OF REPORTING PERSONS: John C. Adler (a Venture Member of InterWest Management Partners VIII, LLC)

	I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):


2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
	(a) o
	(b) o

3	SEC USE ONLY:



4	CITIZENSHIP OR PLACE OF ORGANIZATION:

	United States

		5	SOLE VOTING POWER:

NUMBER OF			211

SHARES		6	SHARED VOTING POWER:
BENEFICIALLY
OWNED BY			633,826

EACH		7	SOLE DISPOSITIVE POWER:
REPORTING
PERSON			211

WITH:		8	SHARED DISPOSITIVE POWER:

			633,826

9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:

	634,037

10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):

	o

11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):

	1.5%

12	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):

	IN

Neither the filing of this statement on Schedule 13G nor any of its contents shall be deemed to constitute an admission by John C. Adler that he is the beneficial owner of any of the Common Stock referred to herein for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended, or for any other purpose, and such beneficial ownership is expressly disclaimed, except to the extent of his pecuniary interest.

Page 9 of 26 Pages


CUSIP No.		62856E 10 4		Page		10		of		26 Pages


1	NAMES OF REPORTING PERSONS: Stephen C. Bowsher (a Managing Director of InterWest Management Partners VIII, LLC)

	I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):


2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
	(a) o
	(b) o

3	SEC USE ONLY:



4	CITIZENSHIP OR PLACE OF ORGANIZATION:

	United States

		5	SOLE VOTING POWER:

NUMBER OF			591

SHARES		6	SHARED VOTING POWER:
BENEFICIALLY
OWNED BY			633,826

EACH		7	SOLE DISPOSITIVE POWER:
REPORTING
PERSON			591

WITH:		8	SHARED DISPOSITIVE POWER:

			633,826

9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:

	634,417

10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):

	o

11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):

	1.5%

12	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):

	IN

Neither the filing of this statement on Schedule 13G nor any of its contents shall be deemed to constitute an admission by Stephen C. Bowsher that he is the beneficial owner of any of the Common Stock referred to herein for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended, or for any other purpose, and such beneficial ownership is expressly disclaimed, except to the extent of his pecuniary interest.

Page 10 of 26 Pages


CUSIP No.		62856E 10 4		Page		11		of		26 Pages


1	NAMES OF REPORTING PERSONS: Harvey B. Cash (a Managing Director of InterWest Management Partners VI, LLC and InterWest Management Partners VIII, LLC)

	I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):


2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
	(a) o
	(b) o

3	SEC USE ONLY:



4	CITIZENSHIP OR PLACE OF ORGANIZATION:

	United States

		5	SOLE VOTING POWER:

NUMBER OF			2,739

SHARES		6	SHARED VOTING POWER:
BENEFICIALLY
OWNED BY			936,521

EACH		7	SOLE DISPOSITIVE POWER:
REPORTING
PERSON			2,739

WITH:		8	SHARED DISPOSITIVE POWER:

			936,521

9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:

	939,260

10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):

	o

11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):

	2.2%

12	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):

	IN

Neither the filing of this statement on Schedule 13G nor any of its contents shall be deemed to constitute an admission by Harvey B. Cash that he is the beneficial owner of any of the Common Stock referred to herein for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended, or for any other purpose, and such beneficial ownership is expressly disclaimed, except to the extent of his pecuniary interest.

Page 11 of 26 Pages


CUSIP No.		62856E 10 4		Page		12		of		26 Pages


1	NAMES OF REPORTING PERSONS: Christopher B. Ehrlich (a Venture Member of InterWest Management Partners VIII, LLC)

	I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):


2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
	(a) o
	(b) o

3	SEC USE ONLY:



4	CITIZENSHIP OR PLACE OF ORGANIZATION:

	United States

		5	SOLE VOTING POWER:

NUMBER OF			117

SHARES		6	SHARED VOTING POWER:
BENEFICIALLY
OWNED BY			633,826

EACH		7	SOLE DISPOSITIVE POWER:
REPORTING
PERSON			117

WITH:		8	SHARED DISPOSITIVE POWER:

			633,826

9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:

	633,943

10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):

	o

11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):

	1.5%

12	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):

	IN

Neither the filing of this statement on Schedule 13G nor any of its contents shall be deemed to constitute an admission by Christopher B. Ehrlich that he is the beneficial owner of any of the Common Stock referred to herein for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended, or for any other purpose, and such beneficial ownership is expressly disclaimed, except to the extent of his pecuniary interest.

Page 12 of 26 Pages


CUSIP No.		62856E 10 4		Page		13		of		26 Pages


1	NAMES OF REPORTING PERSONS: Philip T. Gianos (a Managing Director of InterWest Management Partners VI, LLC and InterWest Management Partners VIII, LLC)

	I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):


2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
	(a) o
	(b) o

3	SEC USE ONLY:



4	CITIZENSHIP OR PLACE OF ORGANIZATION:

	United States

		5	SOLE VOTING POWER:

NUMBER OF			4,315

SHARES		6	SHARED VOTING POWER:
BENEFICIALLY
OWNED BY			936,521

EACH		7	SOLE DISPOSITIVE POWER:
REPORTING
PERSON			4,315

WITH:		8	SHARED DISPOSITIVE POWER:

			936,521

9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:

	940,836

10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):

	o

11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):

	2.2%

12	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):

	IN

Neither the filing of this statement on Schedule 13G nor any of its contents shall be deemed to constitute an admission by Philip T. Gianos that he is the beneficial owner of any of the Common Stock referred to herein for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended, or for any other purpose, and such beneficial ownership is expressly disclaimed, except to the extent of his pecuniary interest.

Page 13 of 26 Pages


CUSIP No.		62856E 10 4		Page		14		of		26 Pages


1	NAMES OF REPORTING PERSONS: W. Scott Hedrick (a Managing Director of InterWest Management Partners VI, LLC and InterWest Management Partners VIII, LLC)

	I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):


2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
	(a) o
	(b) o

3	SEC USE ONLY:



4	CITIZENSHIP OR PLACE OF ORGANIZATION:

	United States

		5	SOLE VOTING POWER:

NUMBER OF			983

SHARES		6	SHARED VOTING POWER:
BENEFICIALLY
OWNED BY			936,521

EACH		7	SOLE DISPOSITIVE POWER:
REPORTING
PERSON			983

WITH:		8	SHARED DISPOSITIVE POWER:

			936,521

9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:

	937,504

10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):

	o

11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):

	2.2%

12	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):

	IN

Neither the filing of this statement on Schedule 13G nor any of its contents shall be deemed to constitute an admission by W. Scott Hedrick that he is the beneficial owner of any of the Common Stock referred to herein for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended, or for any other purpose, and such beneficial ownership is expressly disclaimed, except to the extent of his pecuniary interest.

Page 14 of 26 Pages


CUSIP No.		62856E 10 4		Page		15		of		26 Pages


1	NAMES OF REPORTING PERSONS: W. Stephen Holmes III (a Managing Director of InterWest Management Partners VI, LLC and InterWest Management Partners VIII, LLC)

	I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):


2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
	(a) o
	(b) o

3	SEC USE ONLY:



4	CITIZENSHIP OR PLACE OF ORGANIZATION:

	United States

		5	SOLE VOTING POWER:

NUMBER OF			1,170

SHARES		6	SHARED VOTING POWER:
BENEFICIALLY
OWNED BY			936,521

EACH		7	SOLE DISPOSITIVE POWER:
REPORTING
PERSON			1,170

WITH:		8	SHARED DISPOSITIVE POWER:

			936,521

9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:

	937,691

10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):

	o

11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):

	2.2%

12	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):

	IN

Neither the filing of this statement on Schedule 13G nor any of its contents shall be deemed to constitute an admission by W. Stephen Holmes III that he is the beneficial owner of any of the Common Stock referred to herein for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended, or for any other purpose, and such beneficial ownership is expressly disclaimed, except to the extent of his pecuniary interest.

Page 15 of 26 Pages


CUSIP No.		62856E 10 4		Page		16		of		26 Pages


1	NAMES OF REPORTING PERSONS: Gilbert H. Kliman (a Venture Member of InterWest Management Partners VI, LLC and a Managing Director of InterWest Management Partners VIII, LLC)

	I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):


2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
	(a) o
	(b) o

3	SEC USE ONLY:



4	CITIZENSHIP OR PLACE OF ORGANIZATION:

	United States

		5	SOLE VOTING POWER:

NUMBER OF			1,062

SHARES		6	SHARED VOTING POWER:
BENEFICIALLY
OWNED BY			936,521

EACH		7	SOLE DISPOSITIVE POWER:
REPORTING
PERSON			1,062

WITH:		8	SHARED DISPOSITIVE POWER:

			936,521

9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:

	937,583

10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):

	o

11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):

	2.2%

12	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):

	IN

Neither the filing of this statement on Schedule 13G nor any of its contents shall be deemed to constitute an admission by Gilbert H. Kliman that he is the beneficial owner of any of the Common Stock referred to herein for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended, or for any other purpose, and such beneficial ownership is expressly disclaimed, except to the extent of his pecuniary interest.

Page 16 of 26 Pages


CUSIP No.		62856E 10 4		Page		17		of		26 Pages


1	NAMES OF REPORTING PERSONS: Robert R. Momsen (a Managing Director of InterWest Management Partners VI, LLC)

	I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):


2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
	(a) o
	(b) o

3	SEC USE ONLY:



4	CITIZENSHIP OR PLACE OF ORGANIZATION:

	United States

		5	SOLE VOTING POWER:

NUMBER OF			804

SHARES		6	SHARED VOTING POWER:
BENEFICIALLY
OWNED BY			302,695

EACH		7	SOLE DISPOSITIVE POWER:
REPORTING
PERSON			804

WITH:		8	SHARED DISPOSITIVE POWER:

			302,695

9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:

	303,499

10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):

	o

11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):

	0.7%

12	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):

	IN

Neither the filing of this statement on Schedule 13G nor any of its contents shall be deemed to constitute an admission by Robert R. Momsen that he is the beneficial owner of any of the Common Stock referred to herein for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended, or for any other purpose, and such beneficial ownership is expressly disclaimed, except to the extent of his pecuniary interest.

Page 17 of 26 Pages


CUSIP No.		62856E 10 4		Page		18		of		26 Pages


1	NAMES OF REPORTING PERSONS: H. Ronald Nash (a Venture Member of InterWest Management Partners VIII, LLC)

	I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):


2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
	(a) o
	(b) o

3	SEC USE ONLY:



4	CITIZENSHIP OR PLACE OF ORGANIZATION:

	United States

		5	SOLE VOTING POWER:

NUMBER OF			679

SHARES		6	SHARED VOTING POWER:
BENEFICIALLY
OWNED BY			633,826

EACH		7	SOLE DISPOSITIVE POWER:
REPORTING
PERSON			679

WITH:		8	SHARED DISPOSITIVE POWER:

			633,826

9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:

	634,505

10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):

	o

11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):

	1.5%

12	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):

	IN

Neither the filing of this statement on Schedule 13G nor any of its contents shall be deemed to constitute an admission by H. Ronald Nash that he is the beneficial owner of any of the Common Stock referred to herein for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended, or for any other purpose, and such beneficial ownership is expressly disclaimed, except to the extent of his pecuniary interest.

Page 18 of 26 Pages


CUSIP No.		62856E 10 4		Page		19		of		26 Pages


1	NAMES OF REPORTING PERSONS: Arnold L. Oronsky (a Managing Director of InterWest Management Partners VI, LLC and InterWest Management Partners VIII, LLC)

	I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):


2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
	(a) o
	(b) o

3	SEC USE ONLY:



4	CITIZENSHIP OR PLACE OF ORGANIZATION:

	United States

		5	SOLE VOTING POWER:

NUMBER OF			11,954

SHARES		6	SHARED VOTING POWER:
BENEFICIALLY
OWNED BY			936,521

EACH		7	SOLE DISPOSITIVE POWER:
REPORTING
PERSON			11,954

WITH:		8	SHARED DISPOSITIVE POWER:

			936,521

9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:

	948,475

10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):

	o

11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):

	2.3%

12	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):

	IN

Neither the filing of this statement on Schedule 13G nor any of its contents shall be deemed to constitute an admission by Arnold L. Oronsky that he is the beneficial owner of any of the Common Stock referred to herein for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended, or for any other purpose, and such beneficial ownership is expressly disclaimed, except to the extent of his pecuniary interest.

Page 19 of 26 Pages


CUSIP No.		62856E 10 4		Page		20		of		26 Pages


1	NAMES OF REPORTING PERSONS: Thomas L. Rosch (a Managing Director of InterWest Management Partners VIII, LLC)

	I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):


2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
	(a) o
	(b) o

3	SEC USE ONLY:



4	CITIZENSHIP OR PLACE OF ORGANIZATION:

	United States

		5	SOLE VOTING POWER:

NUMBER OF			1,974

SHARES		6	SHARED VOTING POWER:
BENEFICIALLY
OWNED BY			633,826

EACH		7	SOLE DISPOSITIVE POWER:
REPORTING
PERSON			1,974

WITH:		8	SHARED DISPOSITIVE POWER:

			633,826

9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:

	635,800

10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):

	o

11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):

	1.5%

12	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):

	IN

Neither the filing of this statement on Schedule 13G nor any of its contents shall be deemed to constitute an admission by Thomas L. Rosch that he is the beneficial owner of any of the Common Stock referred to herein for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended, or for any other purpose, and such beneficial ownership is expressly disclaimed, except to the extent of his pecuniary interest.

Page 20 of 26 Pages


CUSIP No.		62856E 10 4		Page		21		of		26 Pages


1	NAMES OF REPORTING PERSONS: Michael B. Sweeney (a Managing Director of InterWest Management Partners VIII, LLC)

	I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):


2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
	(a) o
	(b) o

3	SEC USE ONLY:



4	CITIZENSHIP OR PLACE OF ORGANIZATION:

	United States

		5	SOLE VOTING POWER:

NUMBER OF			875

SHARES		6	SHARED VOTING POWER:
BENEFICIALLY
OWNED BY			633,826

EACH		7	SOLE DISPOSITIVE POWER:
REPORTING
PERSON			875

WITH:		8	SHARED DISPOSITIVE POWER:

			633,826

9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:

	634,701

10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):

	o

11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):

	1.5%

12	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):

	IN

Neither the filing of this statement on Schedule 13G nor any of its contents shall be deemed to constitute an admission by Michael B. Sweeney that he is the beneficial owner of any of the Common Stock referred to herein for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended, or for any other purpose, and such beneficial ownership is expressly disclaimed, except to the extent of his pecuniary interest.

Page 21 of 26 Pages

ITEM 1.

(a)		NAME OF ISSUER : Myogen, Inc.

(b)		ADDRESS OF ISSUER’S PRINCIPAL EXECUTIVE OFFICE :

		7575 West 103^rd Avenue, Suite 102, Westminster, CO 80021

ITEM 2.

(a)		NAME OF PERSON(S) FILING:

		InterWest Partners VI, LP (“IWP VI”) InterWest Investors VI, LP (“II VI”) InterWest Management Partners VI, LLC (“IMP VI”) InterWest Partners VIII, LP (“IWP VIII”) InterWest Investors VIII, LP (“II VIII”) InterWest Investors Q VIII, LP (“IIQ VIII”) InterWest Management Partners VIII, LLC (“IMP VIII”) John C. Adler (“Adler”) Stephen C. Bowsher (“Bowsher”) Harvey B. Cash (“Cash”) Christopher B. Ehrlich (“Ehrlich”) Philip T. Gianos (“Gianos”) W. Scott Hedrick (“Hedrick”) W. Stephen Holmes III (“Holmes”) Gilbert H. Kliman (“Kliman”) Robert R. Momsen (“Momsen”) H. Ronald Nash (“Nash”) Arnold L. Oronsky (“Oronsky”) Thomas L. Rosch (“Rosch”) Michael B. Sweeney (“Sweeney”)

(b)		ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE :

		2710 Sand Hill Road, Second Floor, Menlo Park, CA 94025

(c)		CITIZENSHIP/PLACE OF ORGANIZATION:


		IWP VI:		California
		II VI:		California
		IMP VI:		California
		IWP VIII:		California
		II VIII:		California
		IIQ VIII:		California
		IMP VIII:		California
		Adler:		United States
		Bowsher:		United States
		Cash:		United States
		Ehrlich:		United States
		Gianos:		United States
		Hedrick:		United States
		Holmes:		United States
		Kliman:		United States
		Momsen		United States
		Nash:		United States
		Oronsky:		United States
		Rosch:		United States
		Sweeney:		United States

Page 22 of 26 Pages

(d)		TITLE OF CLASS OF SECURITIES: Common Stock

(e)		CUSIP NUMBER: 62856E 10 4

ITEM 3. NOT APPLICABLE.

ITEM 4. OWNERSHIP.


	IWP VI (1)			II VI (2)		IMP VI (6)
Beneficial Ownership		293,488			9,207		302,695
Percentage of Class		0.7	%	Less than 0.1%			0.7	%
Sole Voting Power		293,488			9,207		302,695
Shared Voting Power		0			0		0
Sole Dispositive Power		293,488			9,207		302,695
Shared Dispositive Power		0			0		0


	IWP VIII (3)			II VIII (4)		IIQ VIII (5)		IMP VIII (7)
Beneficial Ownership		611,474			4,861		17,491		633,826
Percentage of Class		1.5	%	Less than 0.1%		Less than 0.1%			1.5	%
Sole Voting Power		611,474			4,861		17,491		633,826
Shared Voting Power		0			0		0		0
Sole Dispositive Power		611,474			4,861		17,491		633,826
Shared Dispositive Power		0			0		0		0


	Adler (8)			Bowsher (8)			Cash (9)			Ehrlich (8)
Beneficial Ownership		634,037			634,417			939,260			633,943
Percentage of Class		1.5	%		1.5	%		2.2	%		1.5	%
Sole Voting Power		211			591			2,739			117
Shared Voting Power		633,826			633,826			936,521			633,826
Sole Dispositive Power		211			591			2,739			117
Shared Dispositive Power		633,826			633,826			936,521			633,826


	Gianos (9)			Hedrick (9)			Holmes (9)			Kliman (9)			Momsen (10)
Beneficial Ownership		940,836			937,504			937,691			937,583			303,499
Percentage of Class		2.2	%		2.2	%		2.2	%		2.2	%		0.7	%
Sole Voting Power		4,315			983			1,170			1,062			804
Shared Voting Power		936,521			936,521			936,521			936,521			302,695
Sole Dispositive Power		4,315			983			1,170			1,062			804
Shared Dispositive Power		936,521			936,521			936,521			936,521			302,695


	Nash (8)			Oronsky (9)			Rosch (8)			Sweeney (8)
Beneficial Ownership		634,505			948,475	**		635,800			634,701
Percentage of Class		1.5	%		2.3	%		1.5	%		1.5	%
Sole Voting Power		679			11,954			1,974			875
Shared Voting Power		633,826			936,521			633,826			633,826
Sole Dispositive Power		679			11,954			1,974			875
Shared Dispositive Power		633,826			936,521			633,826			633,826

**Includes 7,500 shares issuable to Oronsky pursuant to outstanding options exercisable within 60 days of December 31, 2005.

Page 23 of 26 Pages

ITEM 4. OWNERSHIP-Continued from prior page.

	(1)		Includes 29,719 shares issuable pursuant to warrant exercise within 60 days of December 31, 2005.

	(2)		Includes 932 shares issuable pursuant to warrant exercise within 60 days of December 31, 2005.

	(3)		Includes 118,278 shares issuable pursuant to warrant exercise within 60 days of December 31, 2005.

	(4)		Includes 944 shares issuable pursuant to warrant exercise within 60 days of December 31, 2005.

	(5)		Includes 3,384 shares issuable pursuant to warrant exercise within 60 days of December 31, 2005.

	(6)		IMP VI is the general partner of IWP VI and II VI.

	(7)		IMP VIII is the general partner of IWP VIII, II VIII and IIQ VIII.

	(8)		Bowsher, Rosch and Sweeney are Managing Directors of IMP VIII. Adler, Ehrlich and Nash are Venture Members of IMP VIII.

	(9)		Cash, Gianos, Hedrick, Holmes, and Oronsky are Managing Directors of IMP VI and IMP VIII. Kliman is a Venture Member of IMP VI and a Managing Director of IMPVIII.

	(10)		Momsen is a Managing Director of IMP VI.

ITEM 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS.

This statement is being filed to report the fact that as of the date hereof the Reporting Persons have ceased to be the beneficial owners of more than five percent of the class of securities.

ITEM 6. OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON.

Under certain circumstances set forth in the limited liability company operating agreements of IMP VI and IMP VIII, the members of such limited liability companies have the right to receive dividends from, or the proceeds from the sale of, the common stock of Issuer beneficially owned by such limited liability companies.

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.

No reporting person is a member of a group as defined in section 240.13d-1(b)(1)(iii)(H) of the Act.

ITEM 9.NOTICE OF DISSOLUTION OF THE GROUP.

Not applicable.

ITEM 10. CERTIFICATION.

Not applicable.

EXHIBITS

Joint Filing Statement attached as Exhibit A.

Page 24 of 26 Pages

SIGNATURE

After reasonable 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 14, 2006


INTERWEST PARTNERS VI, LP

By:	InterWest Management Partners VI, LLC

	By:	/s/ W. Stephen Holmes

		Managing Director

INTERWEST INVESTORS VI, LP

By:	InterWest Management Partners VI, LLC

	By:	/s/ W. Stephen Holmes

		Managing Director

INTERWEST MANAGEMENT PARTNERS VI, LLC

By:	/s/ W. Stephen Holmes

	Managing Director

INTERWEST PARTNERS VIII, LP

By:	InterWest Management Partners VIII, LLC

	By:	/s/ W. Stephen Holmes

		Managing Director

INTERWEST INVESTORS VIII, LP

By:	InterWest Management Partners VIII, LLC

	By:	/s/ W. Stephen Holmes

		Managing Director

INTERWEST INVESTORS Q VIII, LP

By:	InterWest Management Partners VIII, LLC

	By:	/s/ W. Stephen Holmes

		Managing Director

INTERWEST MANAGEMENT PARTNERS VIII, LLC

By:	/s/ W. Stephen Holmes

	Managing Director


By:		/s/ John C. Adler

Name:		John C. Adler

By:		/s/ Stephen C. Bowsher

Name:		Stephen C. Bowsher

By:		/s/ Harvey B. Cash

Name:		Harvey B. Cash

By:		/s/ Christopher B. Ehrlich

Name:		Christopher B. Ehrlich

By:		/s/ Philip T. Gianos

Name:		Philip T. Gianos

By:		/s/ W. Scott Hedrick

Name:		W. Scott Hedrick

By:		/s/ W. Stephen Holmes

Name:		W. Stephen Holmes

By:		/s/ Gilbert H. Kliman

Name:		Gilbert H. Kliman

By:		/s/ Robert R. Momsen

Name:		Robert R. Momsen

By:		/s/ H. Ronald Nash

Name:		H. Ronald Nash

By:		/s/ Arnold L. Oronsky

Name:		Arnold L. Oronsky

By:		/s/ Thomas L. Rosch

Name:		Thomas L. Rosch

By:		/s/ Michael B. Sweeney

Name:		Michael B. Sweeney

Page 25 of 26 Pages

EXHIBIT A

JOINT FILING STATEMENT

We, the undersigned, hereby express our agreement that the attached Schedule 13G is filed on behalf of each of us.

Date: February 14, 2006


INTERWEST PARTNERS VI, LP

By:	InterWest Management Partners VI, LLC

	By:	/s/ W. Stephen Holmes

		Managing Director

INTERWEST INVESTORS VI, LP

By:	InterWest Management Partners VI, LLC

	By:	/s/ W. Stephen Holmes

		Managing Director

INTERWEST MANAGEMENT PARTNERS VI, LLC

By:	/s/ W. Stephen Holmes

	Managing Director

INTERWEST PARTNERS VIII, LP

By:	InterWest Management Partners VIII, LLC

	By:	/s/ W. Stephen Holmes

		Managing Director

INTERWEST INVESTORS VIII, LP

By:	InterWest Management Partners VIII, LLC

	By:	/s/ W. Stephen Holmes

		Managing Director

INTERWEST INVESTORS Q VIII, LP

By:	InterWest Management Partners VIII, LLC

	By:	/s/ W. Stephen Holmes

		Managing Director

INTERWEST MANAGEMENT PARTNERS VIII, LLC

By:	/s/ W. Stephen Holmes

	Managing Director


By:		/s/ John C. Adler

Name:		John C. Adler

By:		/s/ Stephen C. Bowsher

Name:		Stephen C. Bowsher

By:		/s/ Harvey B. Cash

Name:		Harvey B. Cash

By:		/s/ Christopher B. Ehrlich

Name:		Christopher B. Ehrlich

By:		/s/ Philip T. Gianos

Name:		Philip T. Gianos

By:		/s/ W. Scott Hedrick

Name:		W. Scott Hedrick

By:		/s/ W. Stephen Holmes

Name:		W. Stephen Holmes

By:		/s/ Gilbert H. Kliman

Name:		Gilbert H. Kliman

By:		/s/ Robert R. Momsen

Name:		Robert R. Momsen

By:		/s/ H. Ronald Nash

Name:		H. Ronald Nash

By:		/s/ Arnold L. Oronsky

Name:		Arnold L. Oronsky

By:		/s/ Thomas L. Rosch

Name:		Thomas L. Rosch

By:		/s/ Michael B. Sweeney

Name:		Michael B. Sweeney

Page 26 of 26 Pages