A bactericidal drug would be preferred over a bacteriostatic drug in a patient with :
Neutropenia
Cirrhosis
Pneumonia
Heart disease
Bactericidal drugs kill the bacteria whereas bacteriostatic drugs only inhibit bacterial growth. Bacteriostatic activity is adequate for the treatment of most infections, the bactericidal activity may be necessary for a cure in patients with altered immune systems like neutropenias, HIV and other immunosuppressive conditions.