Used primarily in research settings to study the metabolism and pharmacokinetics of sildenafil and its analogs. It serves as a reference standard in analytical testing to identify and quantify sildenafil and related compounds in biological samples. Also utilized in forensic investigations to detect adulterated or counterfeit pharmaceutical products, especially in cases involving unapproved sexual enhancement supplements. Its structural similarity to active pharmaceutical ingredients makes it valuable for developing detection methods in clinical and regulatory laboratories.