Suhagra 100 mg is a medication used to treat erectile dysfunction, containing sildenafil citrate as its active ingredient. It is a generic version of Viagra. Research studies evaluating the efficacy of Suhagra 100 mg would generally fall under the broader category of studies assessing the efficacy of sildenafil citrate for the treatment of erectile dysfunction.This study, published in the journal Spinal Cord in 2000, evaluated the efficacy and safety of sildenafil citrate in men with erectile dysfunction caused by spinal cord injury. It found that sildenafil citrate was effective and well-tolerated in this population. This seminal study, published in the New England Journal of Medicine in 1998, was one of the first large-scale clinical trials to demonstrate the efficacy of sildenafil citrate in the treatment of erectile dysfunction. It showed significant improvement in erectile function compared to placebo. This review article, published in the International Journal of Impotence Research in 1999, provides an overview of the efficacy and safety of sildenafil citrate in the treatment of erectile dysfunction based on available clinical trial data at that time. This study, published in the journal Diabetes Care in 2003, specifically evaluated the efficacy of sildenafil citrate in men with diabetes and cardiovascular risk factors. It concluded that sildenafil citrate was effective and well-tolerated in this population. These are just a few examples of the many studies that have evaluated the efficacy of sildenafil citrate, including its generic versions like Suhagra 100 mg, in the treatment of erectile dysfunction. It's important to note that efficacy can vary depending on individual factors such as the underlying cause of erectile dysfunction and other health conditions. Always consult with a healthcare professional for personalized medical advice and treatment options.