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Post-ictal antinociception is characterised by an increase in the nociceptive threshold that accompanies tonic and tonic-clonic seizures (TCS). The locus coeruleus (LC) receives profuse cholinergic inputs from the pedunculopontine tegmental nucleus. Different concentrations (1 μg, 3 μg and 5 μg/0.2 μL) of the muscarinic cholinergic receptor antagonist atropine and the nicotinic cholinergic receptor antagonist mecamylamine were microinjected into the LC of Wistar rats to investigate the role of cholinergic mechanisms in the severity of TCS and the post-ictal antinociceptive response. Five minutes later, TCS were induced by systemic administration of pentylenetetrazole (PTZ) (64 mg/kg). Seizures were recorded inside the open field apparatus for an average of 10 min. Immediately after seizures, the nociceptive threshold was recorded for 130 min using the tail-flick test. Pre-treatment of the LC with 1 μg, 3 μg and 5 μg …