Weapon poison+

Extra-strong weapon poison is made by mixing a cactus spine and red spiders' eggs in a vial of Coconut milk, giving 165 Herblore experience. This requires level 73 Herblore.

Weapon poison(+) can be used on daggers, spears, throwing knives, arrows, crossbow bolts, darts and javelins. One vial will poison one melee weapon or up to 5 projectiles (knives, arrows, bolts, darts or javelins) at a time. Once a weapon has been poisoned by Weapon poison(+), a (p+) will appear after its name. Players poisoned by a dagger or spear poisoned with Weapon poison(+) are dealt 5 points of poison damage initially; after 3 intervals of the same number the damage is reduced by 1 until the player is no longer poisoned. For projectiles, the initial damage is 3.

Production costs
The data in this table is based on the Grand Exchange prices of the Vial of coconut milk, herb, and secondary ingredient(s). It is accurate assuming all three items are bought off of the Grand Exchange and the resulting potion is sold afterwards.