An herbal sexual supplement packed with power, Stiff Nights combines over 20 different herbs and extracts to increase blood flow to the penis, helping to enhance erections and sexual satisfaction. Available in four different amounts, Stiff Nights is easy to try - simply pop a pill a half hour before sex and enjoy the benefits, which typically last anywhere from 36 to 72 hours. Stiff Nights should not be taken by anyone with a serious medical condition or those on prescription medications, especially those containing nitrates.