Document And Entity Information	3 Months Ended
	Mar. 31, 2012	May 03, 2012
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q1
Entity Central Index Key	0001011835
Entity Registrant Name	MEDIVATION, INC.
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Trading Symbol	mdvn
Entity Common Stock, Shares Outstanding		36,250,701