I'm suffering from premature ejaculation... how can it be cured... is there any safe medicine for treating p. e?

Here is no cure...: Strictly speaking, medical professionals have never really cured anyone. All what they've done - drug or procedures- are to modify patient's inside and outside environments so to allow self-healing process to take place as well and much as possible for optimal functional recovery with their own residual strength. Options: behavioral modification, topical numbing cream, SSRIs, etc. See Doc timely.

Suffering?! She is??: The quick "cure" may be to take a an antidepressant in the "SSRI" category, such as citalopram or fluoxetine. These serotonergic agents are notorious for interfering with normal sexual experience with complaints ranging from extremely delayed orgasm to "genital numbness"! On the other hand (no pun intended!) this is almost ALWAYS a problem amenable to sensory "training" look up "squeeze technique"