Most likely no. Penicillin is essentially the oldest antibiotic on the market. Invented for mass usage around the 1942. Which translates to a very high risk that most bacteria will already have developed antibiotic resistance to the antibiotic penicillin. Thus, taking the antibiotic will probably do no good and can actually prolong the pain and the infection. I recommend you either talk to your doctor or find an antibiotic that is more effective and stronger. Yet, even then you still run the risk of have a UTI that is antibiotic resistant to the stronger medicine. For instance, I developed a UTI and the doctor tested my urine and said I had a UTI. Then she prescribed my antibiotics and I was still in pain three days later. My mom, who is a microbiologist, figured the bacteria strain I had was resistant to this drug. So she decided to test me again to see what antibiotics the bacteria was resistant to and what antibiotics the strain of bacteria was susceptible to. After a long painful week with alot of the azi analgesic pills that dye your urine red or orange, I finally received the drugs I needed and the pain began to subside after three day on the strong antibiotics.