Development rationale and features of the base compound
Nicotinic acid itself has the property of dilating blood vessels both in the periphery and in the brain. However, its main drawback is poor tolerability by patients due to pronounced side effects. For this reason, in clinical practice for cerebral circulation disorders, attempts are made to use its modified derivatives, which maintain the necessary therapeutic efficacy but are tolerated significantly better.
Xantinol nicotinate (Complamin)
This is a combination medicinal product whose chemical structure combines elements of nicotinic acid and theophylline.
Pharmacodynamic properties of the drug:
- Vasodilation: dilates peripheral and cerebral blood vessels.
- Hemodynamics: improves blood circulation in both vascular beds.
- Metabolic effect: reduces the severity of cerebral hypoxia.
- Rheology: exhibits a moderate antiplatelet effect, reducing platelet adhesiveness.
The main indication for prescription is peripheral and cerebral circulatory disorders developing against the background of atherosclerosis.
Nicotinoyl-GABA (Picamilon)
This drug is classified as a GABA derivative (gamma-aminobutyric acid). Its chemical molecule combines fragments of GABA and nicotinic acid. The main feature of Picamilon's pharmacological action is selective (preferential) dilation of cerebral blood vessels, making it an important tool in the correction of cerebrovascular disorders.
Briefly: answers to topical questions
What specific side effects does pure nicotinic acid cause that make it poorly tolerated?
Pure nicotinic acid causes the following side effects:
- Vascular reactions — flushing of the face, neck, and upper chest, sensation of warmth.
- Allergic reactions.
- Pruritus.
- Gastrointestinal and cardiovascular disorders.
- Impaired liver function with prolonged use of high doses, accompanied by an excessive increase in NAD and NADP levels.
What other drugs exist within the nicotinic acid derivative group besides xantinol nicotinate and picamilon?
Sources mention the following drugs containing nicotinic acid or its residue:
- Hydroxymethylnicotinamide (Hydroxymethylnicotinamidum) — a derivative of nicotinamide and formaldehyde; a synthetic choleretic agent.
- Nicergoline (Nicergoline) — an ergot alkaloid analogue containing an ergoline nucleus and a bromine-substituted nicotinic acid residue; possesses α-adrenolytic and myotropic spasmolytic activity.
- Enduracin — a prolonged-release form of nicotinic acid.
What is the mechanism of the vasodilating action of nicotinic acid itself?
The vasodilating action of nicotinic acid is associated with the stimulation of prostaglandin synthesis, specifically prostaglandins D2 and E2. Prostaglandin D2 activates DP1 receptors in cutaneous blood vessels, leading to vasodilation, facial flushing, and a sensation of warmth.
Complamin is a combination molecule (nicotinic acid + theophylline). Picamilon is the peak of activity in the brain (a GABA derivative with a selective action on cerebral vessels).
Class and exam questions
Why are nicotinic acid derivatives often used instead of pure nicotinic acid?
Pure nicotinic acid causes marked vasodilation but has poor patient tolerance due to adverse reactions. Its derivatives retain vasodilating properties while offering better tolerability.
What components make up the xantinol nicotinate molecule?
The chemical structure of this drug includes elements of nicotinic acid and theophylline.
What pharmacological group does Picamilon belong to?
Picamilon (nicotinoyl-GABA) belongs to gamma-aminobutyric acid (GABA) derivatives.
What are the main indications for the use of xantinol nicotinate?
It is prescribed for cerebral and peripheral circulatory disorders that develop against the background of atherosclerosis.
What else to study on this topic
- Mechanisms of the vasodilating action of theophylline as part of combination drugs
- Comparative analysis of the tolerability of nicotinic acid and its derivatives
- Impact of the antiplatelet effect of xantinol nicotinate on microcirculation
- The role of GABA derivatives in nervous tissue metabolism during hypoxia
- Criteria for choosing between Picamilon and Complamin in atherosclerosis
Master the entire topic in the «Pharmacology» course
This is a summary. The course covers everything tested in classes and exams.
- Complete study guide on "Nicotinic acid derivatives" and 5,304 more subject pages
- Assignments and quizzes after every topic — just like in a colloquium
- AI tutor answers questions on the topic anytime
- 116 video lessons on the subject
Other topics in the section "Drugs used for cerebral circulatory disorders"
Free video lessons: pharmacologyShort lessons with study notes — no registration required.
Prepared by WhiteCoat Pro faculty in accordance with the medical school curriculum. For educational purposes only.