Soft Pack-40: A Brief Overview of the Drug Soft Pack-40 is an FDA-approved medication used for the treatment of erectile dysfunction (ED). It is considered a safe and effective alternative to other ED medications on the market. Here are some key points to know about Soft Pack-40: 1. How does Soft Pack-40 work? Soft Pack-40 contains the active ingredient sildenafil citrate, which is a phosphodiesterase type 5 (PDE5) inhibitor. PDE5 is an enzyme that plays a role in regulating blood flow to the penis. By inhibiting PDE5, Soft Pack-40 helps relax the blood vessels in the penis, allowing for increased …