Chloroquine hypnozoites

Discussion in 'Canadian Pharmaceuticals Online' started by belweb, 02-Mar-2020.

  1. Tungus Well-Known Member

    Chloroquine hypnozoites


    Vivax, and for terminal prophylaxis (anti-relapse therapy) after travel. Primaquine is also used in the treatment of Pneumocystis pneumonia (PCP), a fungal infection commonly occurring in people with AIDS and, more rarely, in those taking immunosuppressive drugs. vivax in the blood stage through its ability to do oxidative damage to the cell. A single dose of primaquine has rapid and potent ability to kill gametocytes (stage V) of P. vivax in blood; it also kills asexual trophozoites of P. To treat PCP effectively, it is usually combined with clindamycin. However, the exact mechanism of action is not fully understood.

    Novo chloroquine Chloroquine phosphate and invertebrates

    Hypnozoite hip'nō-zō'īt, Exoerythrocytic schizozoite of Plasmodium vivax or P. ovale in the human liver, characterized by delayed primary development; thought to be responsible for malarial relapse. Background. Plasmodium vivax is the most widespread malaria parasite. It has a dormant stage in the human liver, which makes it difficult to eradicate. It is proposed that a relapse of vivax malaria, besides being genetically determined by the specific strain, is induced by the bites of uninfected vectors. It eliminates hypnozoites, the dormant liver form of the parasite, after the organisms have been cleared from the bloodstream. If primaquine is not administered to patients with proven P. vivax or P. ovale infection, a very high likelihood of relapse exists for weeks or months sometimes years.

    Administration of primaquine with food or grapefruit juice increases its oral bioavailibity. However, the WHO has recommended that a single dose of primaquine (0.25 mg/kg) is safe to give even in individuals with G6PD deficiency, for the purpose of preventing transmission of P. Primaquine overdose can cause a dangerous reduction in various blood cell counts, and therefore should be avoided in people at risk for agranulocytosis, which include people with conditions such as rheumatoid arthritis and lupus erythematosus, and those taking concurrent medications that also decrease blood cell counts. Primaquine is well-absorbed in the gut and extensively distributed in the body without accumulating in red blood cells.

    Chloroquine hypnozoites

    WHO Model Prescribing Information Drugs Used in Parasitic Diseases., Activation of the hypnozoite a part of Plasmodium vivax life.

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  7. The hypnozoites are insensitive to atovaquone-proguanil, which is active against liver stage schizonts and to chloroquine. Relapses indicating a dormant stage occur also in Plasmodium ovale and in the simian Plasmodium cynomolgi, Plasmodium fieldi, Plasmodium simiovale and Plasmodium schwetzi infections 5 – 7.

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    Usual Adult Dose for Malaria. Manufacturer Recommendations 15 mg base 26.3 mg salt orally once a day for 14 days Comments-Recommended only for the radical cure of vivax malaria, the prevention of relapse in vivax malaria, or after the end of chloroquine phosphate suppressive therapy in vivax malaria-endemic area Chloroquine is still the drug of choice for the treatment of susceptible strains of P. falciparum and the other 3 malarial. In these species, “hypnozoites. Antimalarial Drugs — Quinine, Quinidine, Sulfonamides, Chloroquine and More. liver hypnozoites. S imilar to that of chloroquine.

     
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