Document and Entity Information	6 Months Ended
	Jun. 30, 2013	Aug. 02, 2013
Document Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q2
Trading Symbol	MDVN
Entity Registrant Name	MEDIVATION, INC.
Entity Central Index Key	0001011835
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		75,212,035