Glaucine

Mechanism of action and pharmacokinetics

Glaucine acts directly on the central nervous system. Its main target is the cough center located in the medulla oblongata. The drug directly blocks the central components of the cough reflex, reducing their excitability.

The most important pharmacodynamic feature of the drug is that it does not activate the opioidergic system. This fundamentally distinguishes it from narcotic antitussives (such as Codeinum or ethylmorphine), which exert their effect through the stimulation of opioid receptors.

Pharmacokinetic profile:

• Absorption: The drug exhibits good absorption in the gastrointestinal tract after oral administration.
• Onset of action: The therapeutic effect develops rapidly — within 30 minutes after administration.
• Duration: The effect persists for a long time, approximately 8 hours, which allows for a reduced frequency of administration.

Pharmacological Effects and Classification

According to the classification of agents affecting respiratory tract functions, glaucine is classified as a centrally acting antitussive drug.

Its primary effect is antitussive. However, unlike opioid analgesics, glaucine has a number of clinical advantages:

1. Absence of abuse potential: The drug does not cause drug dependence (tolerance and addiction).
2. Respiratory safety: It has a significantly lesser effect on the respiratory center, without causing dangerous depression (whereas codeine has a pronounced sedative effect and depresses respiration).

In its pharmacological profile, glaucine is closest to the synthetic drug Oxeladinum (oxeladin). For differential diagnosis, it is important to remember that peripherally acting agents also exist (for example, Prenoxdiazinum), which work differently—they reduce receptor sensitivity directly in the airways rather than in the brain.

Indications for use

The drug is prescribed for the symptomatic treatment of conditions accompanied by a dry, exhausting, non-productive cough. The main goal of administration is to suppress the hyperactive cough reflex, which serves no protective function (does not clear sputum) but exhausts the patient.

Important for students: In pharmacology tests, drugs of this group are often contrasted with mucolytics and expectorants (such as ambroxol, bromhexine, acetylcysteine). Mucolytics promote sputum clearance, and their action is incompatible with the suppression of the cough reflex.

Side effects

Despite the fact that glaucine lacks the side effects of opioids (such as constipation or respiratory depression), it has its own spectrum of adverse reactions.

Key side effects frequently encountered in exam questions:

• Blood pressure reduction (hypotension): The most specific effect of this plant alkaloid.
• Dizziness: Often a consequence of decreased blood pressure.
• Nausea: Possible as a gastrointestinal reaction.

Dosage Form and Prescription Writing

In prescription reference guides, Glaucini hydrochloridum is presented as a solid oral dosage form.

• Dosage form: Tablets, 0.05 g.
• Route of administration: Oral.
• Single dose: 0.05 g.

Example of a prescription for glaucine:

Rp.: Tab. Glaucini hydrochloridi 0,05 D.t.d. N. 20 S. Take 1 tablet orally 2–3 times a day.

Class and exam questions

What else to study on this topic

• Peripherally acting antitussives (prenoxdiazine).
• Narcotic antitussive drugs (codeine, ethylmorphine) and their effect on the central nervous system.
• Synthetic non-narcotic analogs (oxeladin, butamirate).
• Expectorants and mucolytic agents (ambroxol, bromhexine, acetylcysteine).
• Respiratory stimulants: analeptics and nicotinic receptor agonists (nikethamide, cytisine).

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