Kamagra effervescent is the most potent and efficient treatment for impotence and erectile dysfunction. This medication contains a component called sildenafil, which increases blood flow to the male penis tissues and relaxes the penile muscle. This medication can be used before or after eating. This drug has a 4 to 6 hour impact. With this medication, avoid eating fatty foods or drinking cold beverages. Take this medication exactly as prescribed by the doctor.