Origin and chemical properties
Quinine is a natural alkaloid extracted from cinchona bark. Historically, it is the oldest remedy against malaria, used in European medical practice since 1632.
Chemically, a close relative of the drug is quinidine. It is an optical isomer of quinine and possesses a virtually identical spectrum of pharmacological properties.
How the drug works: mechanism of action
The antimalarial effect of the substance is achieved through several pathways:
- Disruption of normal heme metabolism in the pathogen.
- Direct integration (intercalation) into the Plasmodium DNA molecule via hydrogen bond formation.
- Prevention of nucleic acid strand separation, leading to suppression of transcription and translation processes.
Clinical use in malaria
The drug has strict indications and limitations in modern therapy:
- Used exclusively for the treatment of the condition.
- Used only against the erythrocytic stage of malaria.
- Is absolutely not used for disease prevention.
Side effects and poisoning symptoms
The toxic effect of the compound manifests with specific symptoms:
- "Cinchonism": a complex of pathological signs including severe tinnitus, temporary deafness, pronounced headache, nausea, vomiting, and various visual disturbances.
- Cardiotoxicity: the ability to provoke dangerous arrhythmias and cause QT interval prolongation on the electrocardiogram.
Briefly: answers to topical questions
What specific visual disturbances develop within the cinchonism syndrome?
Sources indicate only the development of visual disturbances within cinchonism syndrome, without specifying their exact type.
What are the routes of administration for quinine in severe falciparum malaria?
In severe falciparum malaria, quinine is administered intravenously. Specifically, slow intravenous infusion of quinine dihydrochloride is used, not exceeding a rate of twenty drops per minute.
Which antibiotics are combined with quinine to prevent Plasmodium resistance?
To treat chloroquine-resistant forms of falciparum malaria, quinine is combined with the antibiotic clindamycin. In high doses, this drug is actively used against Plasmodium as part of specific therapeutic regimens.
What hematological complications can quinine use cause?
Quinine use can cause hematological complications in the form of acute erythrocyte hemolysis. In patients with a genetic deficiency of the erythrocyte enzyme glucose-6-phosphate dehydrogenase, this leads to acute hemolysis and hemolytic anemia. Additionally, complications of therapy include massive intravascular erythrocyte hemolysis.
Class and exam questions
What raw material is used to obtain quinine?
Quinine is a natural alkaloid obtained from the bark of the cinchona tree.
For the treatment of which stage of malaria is quinine used?
The drug is used exclusively for the treatment of the erythrocytic stage of malaria and is not prescribed for prevention.
What is "cinchonism"?
This is a specific symptom complex of drug poisoning that includes tinnitus, deafness, headache, nausea, vomiting, and visual disturbances.
What else to study on this topic
- Structural relationship between quinine and its optical isomer quinidine
- Detailed biochemical mechanism of heme polymerization disruption
- Features of intercalation into Plasmodium DNA via hydrogen bonds
- Criteria for cardiotoxicity and causes of QT interval prolongation
- History of the introduction of cinchona bark into European medical practice since 1632
Master the entire topic in the «Pharmacology» course
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