Hi, Welcome to HealthcareMagic Forum.
It is a very common issue, not serious though. Instead of taking medicines you can practice few techniques and exercises. Do you masturbate? If yes, do it one hour before having sex, this will increase your Ejaculation time. Also keep doing Kegel's exercises to strengthen your Pelvic floor
muscles, you do it like you are trying to control your Urine or stools. You can also practice squeeze technique where in your partner holds the penile head and squeezes when you get the urge and continue until your Urge is gone, this is repeated several time until you want to delay.