Both Kamagra vs viagra are used to treat erectile dysfunction. They are members of the same class of medications known as phosphodiesterase type 5 (PDE5) inhibitors, and they function by boosting blood flow to the penis, which helps to induce and sustain an erection. Nasal congestion, dyspepsia, face flushing, headaches, and dizziness are typical adverse effects of Kamagra vs Viagra. Most of the time, these side effects are minor and transient. Some people might find it more convenient to have a longer duration of action, like that of Kamagra, which can last up to 6–8 hours. Conversely, the half-life of Viagra's effects is usually reduced to 4-6 hours.