Kamagra Oral Jelly 100mg belongs to the group of medicines called PDE 5 inhibitors primarily used to treat erectile dysfunction (impotence) in adult men. Kamagra Jelly Cola may be taken on an empty stomach or with a meal. It should be strictly taken as advised by your doctor. You should take about 1 hour before you plan to have sex. This medicine will only help you to get an erection if you are sexually stimulated. The most common side effects of this medicine are flushing (sense of warmth), headache, dizziness, blurred vision, muscle pain, stomach upset, and rash.