Viper venom
TL0; $10/dose. LC0.
Extracted from a live viper (snake of family Viperidae) and used as a follow-up agent on weapon points.
After a delay of 1d seconds, make a HT roll to resist. Failure inflicts 1d toxic damage per wound; success reduces this to 1d-3 per wound.
A viper yields up to four doses; extracting each dose requires a separate Animal Handling roll. Failure means obtaining no further venom from that snake. Critical failure results in snakebite: 2d toxic damage with a HT-2 roll to resist.
Source: GURPS 4th - Low-Tech, page 131