Hello, my boyfriend is 43, when we have sex goes soft also tried viagra (sildenafil) and didn't work .... why?

Erectile dysfunction: Different people respond to different drugs at different doses. If Viagra didn't work, it may also mean that he needs to try higher dose. Or perhaps Cialis, Levitra, (vardenafil) Staxyn, Stendra, etc. Caverject & Muse are also options, using a different drug, alprostadil. Also need to make sure he's basically healthy, eg no diabetes, no high cholesterol, no high blood pressure, no illicit drug use, etc.