<s>[INST] Hey, I have recently gotten checked for an sti. My results came back and I have clymida. Im prescribed with 4 tablets of co-azithromycin monohydrate, 10 tablets of doxycycline. My problem is that everytime I per or masterbate, it burns. Is this normal? Someone help [/INST] HelloThanks for your query, based on the facts that you have posted it appears that you have burning urination every time after you masturbate. During erection and ejaculation there is increased flow of blood to the penis and urine to the extent of 20 times more than normal blood flow that results into congestion of urethra and penis.Moreover, there is semen deposited on the walls of urethra during ejaculation. The dual effect of thick semen being deposited in urethra and residual congestions gives rise to pain while passing urine immediately after masturbation. This pain will go away after semen gets washed away during first urination after masturbation. Ensure to Chat Doctor.  </s>