Final answer:
Drugs with the suffix -cillin, such as penicillins, are a class of antibiotics used to treat various bacterial infections.
Step-by-step explanation:
Drugs that end in the suffix -cillin are typically antibiotics medication. Penicillins are a class of antibiotics that are very effective in the treatment of various bacterial infections. They belong to the broader class of ß-lactam antibiotics due to the presence of the ß-lactam ring, which is crucial for their antibacterial activity. Penicillin antibiotics, like penicillin G, are produced by fungi of the genus Penicillium and are known to combat gram-positive bacteria and some gram-negative bacteria, being very valuable in the treatment of diseases like diphtheria, gonorrhea, pneumonia, and syphilis.