Overview of Antiprotozoal Drugs

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30 Questions

Which type of drugs cause serious toxic effects in the host, particularly on cells showing high metabolic activity?

Antiprotozoal drugs

What infection is caused by Entamoeba histolytica?

Amebiasis

Which disease can be acute or chronic, with varying degrees of illness, from no symptoms to mild diarrhea to fulminating dysentery?

Amebiasis

What is the main diagnostic method for establishing Amebiasis?

Isolating E. histolytica from feces

What is the classification of therapeutic agents for amebiasis based on?

Site of action in the body

Which type of amebicides are effective against both the luminal and systemic forms of amebiasis?

Mixed amebicides

What is the drug of choice for treating amebic infections?

Metronidazole

Which drug is a prodrug that is reduced intracellularly by anaerobic bacteria to its active form?

Metronidazole

Which drug is effective against E. histolytica trophozoites and cyst forms?

Iodoquinol

Which drug accumulates in patients with severe hepatic disease?

Metronidazole

Which drug should be avoided during alcohol consumption?

Tinidazole

Which drug is used for treatment of giardiasis and trichomoniasis?

Tinidazole

Which drug is used for treatment of asymptomatic colonization state after completion of invasive intestinal or extra-intestinal amebic disease treatment?

Paromomycin

Which drug has adverse effects including rash, diarrhea, and dose-related peripheral neuropathy, including a rare optic neuritis?

Iodoquinol

Amebiasis is an infection of the intestinal tract caused by Entamoeba ______.

histolytica

Anti-protozoal drugs are used for the treatment of Amebiasis, Malaria, Trypanosomiasis, Leishmaniasis, Toxoplasmosis, and ______.

Giardiasis

Therapeutic agents for amebiasis are classified according to the site of action as: Luminal amebicides act on the parasite in the lumen of the bowel, Systemic amebicides are effective against amebas in the intestinal wall and ______.

liver

Amebiasis can be acute or chronic, with varying degrees of illness, from no symptoms to mild diarrhea to fulminating ______.

dysentery

Diagnosis of Amebiasis is established by isolating E. ______ from feces.

histolytica

Therapy for Amebiasis is indicated for acutely ill patients and asymptomatic carriers, since dormant E. histolytica may cause future infections in the carrier and be a potential source of infection for ______.

others

Metronidazole, a nitroimidazole, is the __________ amebicide of choice for treating amebic infections.

mixed

Metronidazole is the drug of choice for the treatment of pseudomembranous colitis caused by the anaerobic Clostridium __________.

difficile

Metronidazole is a prodrug that is reduced intracellularly by the anaerobic bacteria to its active ________.

form

Metronidazole is completely and rapidly absorbed after oral administration and therapeutic levels can be found in vaginal and seminal fluids, saliva, breast milk, and cerebrospinal fluid (CSF). The drug accumulates in patients with severe ________ disease.

hepatic

The parent drug and its metabolites are excreted in the ________.

urine

Tinidazole is a second-generation nitroimidazole that is similar to metronidazole in spectrum of activity, absorption, adverse effects, and drug ________.

interactions

Tinidazole is as effective as metronidazole, with a shorter course of treatment, but it is more ________.

expensive

A luminal agent, such as: iodoquinol, diloxanide furoate, paromomycin, should be administered for treatment of the asymptomatic colonization ________.

state

Iodoquinol, a halogenated 8- hydroxyquinolone, is amebicidal against E. histolytica and is effective against the luminal trophozoite and cyst ________.

forms

Adverse effects of iodoquinol include rash, diarrhea, and dose-related peripheral neuropathy, including a rare optic ________.

neuritis

Study Notes

Amebiasis and Anti-Protozoal Drugs

  • Amebiasis is an infection of the intestinal tract caused by Entamoeba histolytica.
  • The disease can be acute or chronic, with varying degrees of illness, from no symptoms to mild diarrhea to fulminating dysentery.

Anti-Protozoal Drugs

  • Anti-protozoal drugs are used for the treatment of Amebiasis, Malaria, Trypanosomiasis, Leishmaniasis, Toxoplasmosis, and Giardiasis.
  • Therapeutic agents for amebiasis are classified according to the site of action as:
    • Luminal amebicides act on the parasite in the lumen of the bowel.
    • Systemic amebicides are effective against amebas in the intestinal wall and extraintestinal tissues.

Diagnosis and Treatment

  • Diagnosis of Amebiasis is established by isolating E. histolytica from feces.
  • Therapy for Amebiasis is indicated for acutely ill patients and asymptomatic carriers, since dormant E. histolytica may cause future infections in the carrier and be a potential source of infection for others.
  • Metronidazole, a nitroimidazole, is the drug of choice for treating amebic infections.
  • Metronidazole is a prodrug that is reduced intracellularly by anaerobic bacteria to its active form.
  • The drug accumulates in patients with severe hepatic disease.
  • Metronidazole is completely and rapidly absorbed after oral administration and therapeutic levels can be found in vaginal and seminal fluids, saliva, breast milk, and cerebrospinal fluid (CSF).

Other Amebicides

  • Tinidazole is a second-generation nitroimidazole that is similar to metronidazole in spectrum of activity, absorption, adverse effects, and drug interactions.
  • Tinidazole is as effective as metronidazole, with a shorter course of treatment, but it is more expensive.
  • Iodoquinol, a halogenated 8- hydroxyquinolone, is amebicidal against E. histolytica and is effective against the luminal trophozoite and cyst forms.
  • Adverse effects of iodoquinol include rash, diarrhea, and dose-related peripheral neuropathy, including a rare optic neuritis.
  • Iodoquinol is used for treatment of asymptomatic colonization state after completion of invasive intestinal or extra-intestinal amebic disease treatment.
  • Tinidazole is used for treatment of giardiasis and trichomoniasis.

Learn about the overview and summary of antiprotozoal drugs used for the treatment of diseases like amebiasis, malaria, trypanosomiasis, leishmaniasis, toxoplasmosis, and giardiasis. Understand the chemotherapy for amebiasis and the infection of amebiasis (amebic dysentery).

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