Final answer:
Clindamycin is the drug used against intestinal anaerobic bacteria that can also alter normal flora.
Step-by-step explanation:
The drug used against intestinal anaerobic bacteria that can also alter normal flora is Clindamycin. Clindamycin is an antibiotic that is effective against anaerobic bacteria present in the intestines. However, it also disrupts the normal flora of the intestines, which can lead to imbalances in the gut microbial community.
Intestinal anaerobic bacteria are microorganisms that thrive in environments with low or no oxygen, such as the anaerobic conditions found in the human intestines. The human gastrointestinal tract is home to a vast and diverse community of microorganisms, collectively known as the gut microbiota. Anaerobic bacteria constitute a significant portion of the gut microbiota and play crucial roles in maintaining gut health and overall well-being.