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Penicillin ( PCN or pen ) is a group of antibiotics which include penicillin G ( intravenous use ), penicillin V (use by mouth), procaine penicillin , and benzathine penicillin ( intramuscular use ). Penicillin antibiotics were among the first medications to be effective against many bacterial infections caused by staphylococci and streptococci . Penicillins are still widely used today, though many types of bacteria have developed resistance following extensive use.
Do not use this medication if you are allergic to penicillin V or to any other penicillin antibiotic, such as amoxicillin (Amoxil), ampicillin (Omnipen, Principen), carbenicillin (Geocillin), dicloxacillin (Dycill, Dynapen), or oxacillin (Bactocill).
Benzylpenicillin , also known as penicillin G , is an antibiotic used to treat a number of bacterial infections . This includes pneumonia , strep throat , syphilis , necrotizing enterocolitis , diphtheria , gas gangrene , leptospirosis , cellulitis , and tetanus . It is not a first-line agent for pneumococcal meningitis .  Benzylpenicillin is given by injection into a vein or muscle .  Two long acting forms benzathine benzylpenicillin and procaine benzylpenicillin are available for use by injection into a muscle. 
Penicillin is one of the earliest discovered and widely used antibiotic agents, derived from the Penicillium mold. Antibiotics are natural substances that are released by bacteria and fungi into the their environment, as a means of inhibiting other organisms - it is chemical warfare on a microscopic scale.