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Penicillin (PCN or pen) is a group of antibiotics which include penicillin G (intravenous use), penicillin V (oral use), procaine penicillin, and benzathine penicillin (intramuscular use). They are derived from Penicillium fungi.
Photo Credit Chepko/iStock/Getty Images. Penicillin is a prescription antibiotic used to treat a variety of bacterial infections. Ampicillin, amoxicillin and benzylpenicilllin are next-generation antibiotics, and are more commonly used today. When the immune system is weak and unable to fight infection, antibiotics are prescribed. You may also want to try certain supplements that have been shown to strengthen the immune system.