Can you buy penicillin over the counter uk: Penicillins (P, PCN, or PEN) are antibiotics derived from Penicillium molds, most notably P. chrysogenum and P. Rubens. The vast majority of penicillins in clinical use are synthesized chemically from naturally occurring penicillins.
Although several natural penicillins have been discovered, only two purified compounds are currently in clinical use: penicillin G (intravenous use) and penicillin V (oral use) (given by mouth).
Penicillins were among the first antibiotics to be effective against a wide range of staphylococcal and streptococcal infections. They belong to the class of antibiotics known as -lactams, which are among the most powerful and successful discoveries in modern science.