Kamagra Chewable Tablets usually start working within 30 to 60 minutes after ingestion. However, the onset of action may vary based on factors such as whether the tablet is chewed on an empty stomach or after a meal. Kamagra Chewable Tablets contain sildenafil citrate, which is the same active ingredient found in Viagra. Sildenafil citrate works by increasing blood flow to the penis during sexual stimulation, leading to improved erectile function.