This sounds frustrating man, sorry it's happening. During sex with a partner, you can not maintain full erection? Are you semi erect then? This is a question I have to ask. Cialis works on physical problems that lead to ED but not mental health ones. Are you suffering any type of anxiety, depression, mental health issue? This can also impact erection. what happens if you take a higher dose of cialis? It goes all the way up to 20mg. I'd see about a higher dose and if that helps.