How are penicillin and cyclosporine alike and different?

Penicillin and cyclosporine are both significant in medicine, but they serve different purposes. Penicillin is an antibiotic that targets bacterial infections by inhibiting cell wall synthesis, while cyclosporine is an immunosuppressant used primarily to prevent organ transplant rejection by suppressing the immune response. Both drugs have revolutionized their respective fields—infectious disease and transplant medicine—but they differ in their mechanisms of action and therapeutic applications. Additionally, penicillin is derived from mold, while cyclosporine is a peptide produced by fungi.