Multiple Spells in One Potion

[Bao Hadir]

Is this a thing? Context: I'm building an alchemist, and was thinking about picking up the Eternal Potion discovery at some point. So:
A) Can I brew a potion with multiple spell effects?
B) Can I do it all at once or do I have to finish the initial potion before adding another spell?
C)How would spell levels fall into this? 3 1st level spells or a 1st and 2nd? Or could I keep adding spells as long as the level of spell I'm adding is 3rd level or lower?

[Claxon]

Not to my knowledge, it is not possible to brew a potion that contains multiple spell effects.

Assuming it is not supported within the rules already, as a GM I would not allow it, especially consider how beneficial that would be with Eternal Potion. It's already really good.

[Saethori]

Combine Extracts is the closest thing you're going to get.

[Claxon]

Extend Potion (the prereq for Eternal Potion) specifies it can't be used on Extracts. While Eternal Potion doesn't list the same restriction, I believe it's assumed to be inherited. So Combine Extracts isn't going to do him much good.

[Saethori]

I'm aware. I'm simply saying it's the closest thing there is to a potion with multiple effects.

It was intended as more of an anecdote, rather than a correction.

[CBDunkerson]

Pathfinder reskinned 'potions that break the rules' as 'elixirs', a type of wondrous item.

So, no you can't make a "potion" with multiple spell effects. You could make an "elixir" to do so, but most GMs would likely not allow it to work with Eternal Potion and most other potion based options.

[bodhranist]

I don't know of any way in the rules to make multiple-effect potions.

As a house rule, I'd allow a total of 3 spell levels of spells to be combined (as in up to 3 1st level, or a 1st and a 2nd), but for two spell levels they'd have to each be at CL 3 (increasing the cost (and power)), or at CL 5 for three spell levels. Also, each effect after the first would have the "+50% for multiple different abilities" cost increase (even if they were identical, e.g. two cure light wounds), and you'd only be able to choose one spell effect to use eternal potion on.