Kamagra 100 works in 15 minutes and gives you a hard erection that can last for 5-6 hours, giving the man enough time to perform without staying in bed. These tablets are used to treat the erectile dysfunction of men, they treat pulmonary arterial hypertension (PAH) and they help men who suffer from ED to maintain an erection even when they are excited. The Kamagra tablets should be taken after 45 minutes of sexual activity to maintain a stable erection.