Sunday 15 July 2012

Antimalarial Drugs


 Antimalarial Drugs


Q1. Why does only female anopheles mosquito cause malaria?

A.   because female are evolutionarily designed to be cruel
B.    because female need blood from vertebral host to nourish eggs
C.   males find it difficult to suck blood
D.   blood is the only diet for female mosquitoes

Answer- B

Q2.  A patient is given an anti-malarial for plasmodium falciparum. After taking the drug, he has anemia, cynosis, tachypnoea and passage of dark urine. The patient is given which drug?

A.   chloroquine
B.    mefloquine
C.   artesunate
D.   primaquine

Answer- D
Primaquine is a 8-aminoquinine given to prevent relapse by action against hypnozoites. It should not be given to Glucose-6-phosphate dehydrogenase deficient people.  Glucose-6- phosphate dehydrogenase deficiency leads to less production of NADPH via HMP pathway which is essential for RBC. Lack of it leads to
heamolysis(passage of dark urine), cynosis (lack of oxygen due less RBC) and anemia.

Q3. Which of the following 4- amino quinoline is used for malaria as well as in rheumatoid arthritis and it causes reversible retinal damage?

A.   chloroquine
B.    pyrimethamine
C.   mefoquine
D.   amodiaquine

   Answer- A
Chloroquine causes retinal damage due to its high plasma binding.
Q4.  Which of the following can be used in pregnancy to treat malaria?

A.   quinine
B.    primaquine
C.   chloroquine
D.   pyrimethamine

Answer- C

Q5. Biguanides prevent

A.   DHFRase
B.    G6P dehydrogenase
C.   Hemazoin formation
D.   None of the above

Answer- Biguanides such as proguanil and pyrimethamine prevent DHFRase

Q6. A person suffers from cancer and is undergoing chemotherapy. He now contracts malaria. Methotrexate is given for the chemotherapy and pyrimethamine for malaria. This treatment should be supplemented with?

A.   Corticosteroids
B.    Folinic acid
C.   Dextrose solution
D.   None of the above

 Answer-B
Both drugs are DHFRase inhibitors which inhibit formation of folic acid in the body. Hence folinic acid is gven which is converted to active form of folic acid – THF (tetra hydro folate)    

Q7. How do antibacterial drugs like doxycycline and sulphadoxine work against protozoal plasmodium parasite?

A. mechanism unknown
B. by affecting apicoplast enzymes
C. by peroxide formation
D. none of these

Answer- B
apicoplast is plasmid like organelle in plasmodium thought to be aquired from other organism by process of endosymbiosis during its course of evolution. This is used as a potential target against plasmodium.   




7 comments:

  1. Antimalarial Drugs must be made easily available across the globe to counter deadly disease.

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