hi..MIFAN,...thanks for writing..i have understood your concerns.. causes for premature ejaculation in your age is usually psychological, so if you are passing through any stressful events then try to cope with anxiety..also the anxiety about the sexual performance is also related to premature ejaculation.. premature ejaculation can be treated with behavioral methods and drugs.. behavioral methods are: squeeze technique, stop-start method and other interruption methods..you can read them from the internet and consult a psychiatrist for details.. drugs are available to treat premature ejaculation, like antidepressant medications [SSRIs]. these drugs causes delay in ejaculation as a side effect of their use..which is therapeutic in treating premature ejaculation.. the drug cylagra is a brand name of drug sildenafil, which is used to treat erectile dysfunction..it will help you hold erection for longer duration but it wont help you in premature ejaculation..there are side effects of sildenafil, sometimes serious also..you need o know that u shudnt use cylagra, because it wont help in premature ejaculation.. for treatment of premature ejaculation you shud consult a psychiatrist and ask for help..he will guide you properly..dont take medications without consulting the professionals.. the common side effects of sildenafil are headache, flushing, dyspepsia, nasal congestion and impaired vision, including photophobia and blurred vision. rare bur serious side effects are optic neuropathy, hypotension, priapism, heart attack, arrythmias, stroke etc... i hope this advice will be helpful to you...best luck..