Kamagra claims to be an ED treatment similar to Viagra. It’s available as a tablet, an effervescent tablet, or an oral jelly, and is popular for being a cheap alternative to Viagra. Like Viagra, the active ingredient in Kamagra is sildenafil citrate 100mg. It belongs to a class of drugs called phosphodiesterase 5 (PDE5) inhibitors, and so Kamagra is thought to work like Viagra.