@burcinc-- Have you seen a doctor?
I know that amoxicillin can be used for gonorrhea. Gonorrhea is treated with penicillin group antibiotics and amoxicillin is one of them. But I don't know if amoxicillin is the preferred treatment for gonorrhea and chlamydia.
For adults, amoxicillin is usually prescribed 500-1500mg/day depending on the kind of infection and how serious it is. You really need to see a doctor because it can be dangerous to use antibiotics without doctor supervision. You could overdose or you might not take enough and that will make the infection worse. You certainly don't want that.