The use of poison of Gor is generally considered not worthy of men. It is against the Code of Warriors. It is thought of as a weapon of women.
Marauders of Gor, page 18

"Sullius Maximus," he said, "invented such a drug. He tested it, by pin pricks, on the limbs of a captured enemy, paralyzing him from the neck down. He kept him seated at his right side, as a guest in regal robes, for more than a week. When he tired of the sport he had him killed."
Marauders of Gor, page 19

On the twentieth day of the siege there was great rejoicing in the camp of Pa-Kur, because in one place the wires had been cut and a squad of spearmen had reached the main siege reservoir, emptying their barrels of toxic kanda, a lethal poison extracted from one of Gor's desert shrubs.
Tarnsman of Gor, page 179

Saphrar was a short, fat, pinkish man, with short legs and arms; he had quick bright eyes and a tiny, roundish red-lipped mouth; upon occasion he moved his small, pudgy fingers, with rounded scarlet nails, rapidly, as though rubbing the gloss from a tarn disk or feeling the texture of a fine cloth; his head, like that of many merchants, had been shaved; his eyebrows had been removed and over each eye four golden drops had been fixed in the pinkish skin; he also had two teeth of gold, which were visible when he laughed, the upper canine teeth, probably containing poison.
Nomads of Gor, page 85

"They are poison teeth," remarked Harold, "a Turian affectation but quite deadly, being filled with the venom of the Ost."
Nomads of Gor, page 187

Sullius Maximus, who himself dabbled in poetry, and poisons, was a man of high culture, and his opinions in such matters were greatly respected.
Raiders of Gor, page 224