Girlfriend has bladder infection every time we have sex :(

Ive had this too with my self antibiotics will make it worse ,first her doctor have to find out what type of the bacteria is causing this .If itsts gram positive or gram negative like E.coli you shouldnt take antibiotics as e.coli gets more resistant after every cure .
Gram positive like proteuss is easy to treat with antibiotics or cranberry juice you only have to make your urine more acidic but this infection is not so common common are e.coli bugs (gram negative bacteria) and this one is very difficul to get rid off.
A cure that finally worked for me after I tryed a lot of was cinnamon and honey for me and my husband
boiling 2tbs cinnamon as a tea add here 1 tbs real raw honey in a glass(500ml)every morning for my husband for a month and for me the same only 3 times a day seemed to get rid of the infection you should take it to as this bugs live in your saliva and anywere with moisture, so you need both to be treatet
Cinnamon is great natural treatment killing bacteria in the bladder

I hope I helped good luck