The answer is no. Viagra helps for erectile dysfunction, a physical problem. Performance anxiety is a mental problem, and requires changes to the way you think and behave in order to face your fears. If you have performance anxiety about sex, then the solution begins with a frank discussion with your partner, then a willingness to look at your irrational thoughts about sex, and how those thoughts induce anxiety. You can also look at your avoidant behaviors which maintain this vicious, negative cycle of performance anxiety.