Which drug is commonly used to treat giardiasis?

Which drug is commonly used to treat giardiasis?

• A. Ciprofloxacin
• B. Acyclovir
• C. Albendazole
• D. Metronidazole

Answer: (D)

Giardiasis is treated with drugs that specifically target anaerobic protozoa. Metronidazole is the first-line therapy for Giardia lamblia because it enters the parasite and, once activated in its anaerobic environment, creates reactive compounds that damage the parasite’s DNA and other vital structures, effectively killing it. This mechanism makes metronidazole particularly effective against Giardia, which is why it’s chosen over other agents. Ciprofloxacin targets bacterial DNA gyrase and isn’t effective against Giardia. Acyclovir is an antiviral that acts on viral enzymes and has no activity against protozoa. Albendazole is an antihelminthic mainly used for parasitic worms and is not the standard treatment for Giardia as a single agent.

Giardiasis is treated with drugs that specifically target anaerobic protozoa. Metronidazole is the first-line therapy for Giardia lamblia because it enters the parasite and, once activated in its anaerobic environment, creates reactive compounds that damage the parasite’s DNA and other vital structures, effectively killing it. This mechanism makes metronidazole particularly effective against Giardia, which is why it’s chosen over other agents.

Ciprofloxacin targets bacterial DNA gyrase and isn’t effective against Giardia. Acyclovir is an antiviral that acts on viral enzymes and has no activity against protozoa. Albendazole is an antihelminthic mainly used for parasitic worms and is not the standard treatment for Giardia as a single agent.