Apcalis Oral Jelly is a medication commonly used to treat erectile dysfunction (ED) in men. It typically contains tadalafil, an active ingredient that improves blood flow to the penis, helping men achieve and maintain an erection during sexual stimulation. Check the packaging to confirm the exact formulation and strength. Tadalafil belongs to a class of medicines called phosphodiesterase type 5 (PDE5) inhibitors. It relaxes certain blood vessels and improves blood flow to the penis when sexual stimulation occurs. Its effects may last up to 36 hours, although this does not mean an erection lasts that long.