Ladygra 100 contains sildenafil citrate, a medicine belonging to a group of drugs called phosphodiesterase type 5 (PDE5) inhibitors. Sildenafil is widely used to treat erectile dysfunction (ED) in adult men. Erectile dysfunction is the inability to get or maintain an erection firm enough for satisfactory sexual activity. In the UK, sildenafil is available as a prescription medicine and, in certain strengths and circumstances, can also be supplied through a pharmacy following an appropriate assessment.