What is Penicillin VK 500 used for?

Penicillin VK 500 is used to treat bacterial infections such as syphilis, strep throat, pneumonia, pharyngitis, gingivitis, rheumatic fever and bacterial endocarditis, according to Drugs.com. Common side effects of this drug include headaches, vaginal discharge or itching and sores along the tongue or mouth.

Less common side effects of Penicillin VK 500 include red, scaly skin; joint pain; fever; skin rashes; irregular or fast breathing and swelling or puffiness of the face. Drugs.com also notes that in rare cases this drug can cause mental depression, unusual bleeding or bruising, severe diarrhea, abdominal tenderness and yellowing of the skin or eyes.