Zolazepam and Tiletamine

**Zolazepam/Tiletamine** (commonly known by trade names such as Zoletil or Telazol) is a combination injectable anesthetic agent widely used in veterinary medicine for general anesthesia in dogs and cats. It combines a dissociative anesthetic (tiletamine) with a benzodiazepine (zolazepam) to provide anesthesia with concurrent muscle relaxation. > **Clinical Warning:** The combined product should **not** be used as the sole anesthetic agent for painful operations. It lacks sufficient visceral analgesia and must be combined with an appropriate analgesic (e.g., opioids, NSAIDs). **Clinical Pearl:** Recovery from this combination can be prolonged (2-6 hours) and sometimes rough or excitable, particularly in dogs given higher doses. Premedication (e.g., with alpha-2 agonists or phenothiazines, though noting interactions) often increases the smoothness of recovery. Recovery is generally more prolonged in cats than in dogs.

กลไกการออกฤทธิ์: The drug is a 1:1 combination of two active principles with complementary mechanisms: * **Zolazepam:** A benzodiazepine that enhances the activity of **GABA** (gamma-aminobutyric acid) → the major inhibitory neurotransmitter within the CNS. This provides sedative, anxiolytic, and muscle-relaxing actions, counteracting the muscle rigidity typically caused by dissociative agents. * **Tiletamine:** A dissociative anesthetic (pharmacologically similar to ketamine) that antagonizes **NMDA (glutamic acid) receptors** → depresses certain cerebral regions (thalamus and cortex) while the limbic system remains active, generating a state of dissociative anesthesia.

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