Document and Entity Information
3 Months Ended
Mar. 31, 2015
Apr. 27, 2015
Document and Entity Information    
Entity Registrant Name VIVUS INC  
Entity Central Index Key 0000881524  
Document Type 10-Q  
Document Period End Date Mar. 31, 2015  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding   103,816,199
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q1