Eriacta 100 mg is a brand of sildenafil citrate, a PDE5 inhibitor used to treat erectile dysfunction (ED) in adult men. Sildenafil helps increase blood flow to the penis when sexual stimulation occurs, making it easier to achieve and maintain an erection. It does not directly increase sexual desire or testosterone. The 100 mg strength is generally considered the maximum recommended sildenafil dose for most adults and is typically taken as needed, not more than once in 24 hours. The appropriate dose depends on factors such as age, other medicines, and overall health. A healthcare professional may recommend a lower dose if appropriate.