14 topics with concise breakdowns: definitions, key facts, and class questions.
This section is dedicated to the pharmacology of vitamin preparations — essential biocatalysts and metabolic regulators. Here we examine their classification, mechanisms of action at the cellular level, and the principles of rational pharmacotherapy.
The section covers fat-soluble (A, D, E, K) and water-soluble (B1, B2, B6, B12, C, PP, P) vitamins in detail. Special attention is paid to vitamin-like compounds, complex multivitamin preparations, cytamines, and the arachidonic acid cascade, which is logically related to the regulation of cellular metabolism.
In classes and exams, questions usually focus not just on drug names, but on their coenzyme functions. Particular emphasis should be placed on the symptoms of hypervitaminosis (especially for A and D), the pharmaceutical and pharmacodynamic interactions of B-group vitamins when co-administered, and the role of arachidonic acid metabolism enzymes in inflammation. Understanding these processes is a fundamental skill for a future physician.
What is the primary feature used to classify vitamins in pharmacology?
The basic classification is based on their solubility. Two large groups are distinguished: fat-soluble and water-soluble vitamins.
Which animal-derived products contain $\beta$-carotene?
None. $\beta$-carotene (provitamin A) is synthesized exclusively in plants. Its main sources are brightly colored vegetables, fruits, and greens.
Why does standard vitamin D fail to work in renal failure?
In renal pathologies, the production of the 1-hydroxylase enzyme is impaired. As a result, inactive circulating calcidiol cannot be converted into active calcitriol, and the activation process is blocked.
Which form of vitamin E is the most active?
The most active and clinically significant form is alpha-tocopherol.
Why do bleeding disorders requiring vitamin K administration develop in obstructive jaundice?
In obstructive jaundice, bile does not enter the intestine, which drastically impairs the absorption of fat-soluble vitamin K. This leads to decreased synthesis of prothrombin and other clotting factors in the liver.
What biochemical role does thiamine play as a coenzyme?
Upon phosphorylation, thiamine is converted into thiamine diphosphate (cocarboxylase), which acts as a coenzyme in enzymatic reactions, such as the decarboxylation of $\alpha$-keto acids.
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