The penitentiary is mightier than the sword.

The tough guys charged with attempted murder after knifing each other during a Brooklyn street fight over a woman are now too fragile for jail.

Ex-con Benny Geritano, 39, has been arraigned and held in lieu of $250,000 bail, but an infirmary trip for an undisclosed medical ailment is keeping him from the general prison population.

Meanwhile, his rival, Lucali pizza-parlor owner Mark Iacono, 44, was due to be arraigned — but developed a sudden stomachache in the hospital where he is recovering from wounds sustained in the Carroll Gardens fight last week.