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Antivenom is a very potent substance very much worth carrying around if you think that a possibility of encountering a certain monster is real and can get your hands on a vial or two. For example, I'd like my character to have Antivenom against Phase Spiders.

Creating this item is a complex process that requires a dose of target venom. However, prices are only listed for a very limited set of poisons. I think I remember seeing a formula based on monster CR, but I didn't happen to find it now, and it might actually be a figment of my imagination.

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From your own link,

Purchasing Antivenom

Antivenom is not particularly expensive, but because it is highly specialized, it can be difficult to find. A dose of antivenom has a market price equal to half the market price of a dose of the poison in question, but it is treated as though its price were five times the market price of the poison for the purposes of determining its availability in any given settlement. Alternatively, if 1 or more doses of the poison in question can be provided, most alchemists will supply as much antivenom as they can produce from the doses for a fee of 10% of the market price of the poison.

(Antivenom description, emphasis mine)

So it costs half the given poison does, or a tenth if you already have the poison. Mundane crafting costs one-third the purchase price, so a sixth or a thirtieth if you already have the poison.

The cost of the poison itself, however, is going to be up to the GM in a large number of cases, because there are not any rules for determining it. I do not believe there is any CR-based formula as you recall; I have never heard of such a thing and the closest I could find was a homebrew effort.

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  • \$\begingroup\$ To be more specific, I don't understand how to determine the poison price. There are prices listed for some poisons, but not, say, Phase Spider poison. \$\endgroup\$ – Baskakov_Dmitriy Jul 9 '20 at 16:01
  • \$\begingroup\$ @Baskakov_Dmitriy because maybe such poisons can't be bought, you'd need to harvest them from the spider \$\endgroup\$ – Trish Jul 9 '20 at 16:13
  • \$\begingroup\$ @Trish Then this is the answer -- it can't be bought. \$\endgroup\$ – Baskakov_Dmitriy Jul 9 '20 at 16:30
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    \$\begingroup\$ @Baskakov_Dmitriy No, that’s an answer to a separate question that you didn’t originally ask, and instead have morphed this one into after the fact. Please be more careful with your questions. \$\endgroup\$ – KRyan Jul 9 '20 at 16:54
  • \$\begingroup\$ @KRyan I will try to. Sorry. \$\endgroup\$ – Baskakov_Dmitriy Jul 9 '20 at 18:25

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