I've heard it said that when a Potion of Speed's duration has expired, you don't suffer the negative effects of the Haste spell.

Is this true? From my understanding of the wording of Potion of Speed, I can't see why this would be the case as I would consider it part of the "effect" of the spell?

Thoughts?

I believe your correct, they would get the positive and negative of the Haste spell. 

Obviously concentration is no longer an issue, which does mean this negative is unlikely to happen during the battle at least. 

Most potions don't let you forego concentration, but the potion of speed does. Most spells don't deal with what happens when they end, but haste does. If the potion of speed was meant to spare the drinker from what happens when haste ends, it would definitely say so.

I'd say you get the negative effect too.

You'll suffer the effect... At the end of the duration. Which is probably 30+ seconds after combat has ceased. So it's essentially a non-issue.

Quote from ChoirOfFire >>

You'll suffer the effect... At the end of the duration. Which is probably 30+ seconds after combat has ceased. So it's essentially a non-issue.

Well - you gain the effect of the spell - so it should be possible to dispel it - so it could end mid-combat.

Does "gain the effect of the Haste spell" mean the same thing as having haste cast on you as a spell?

The effect of the haste spell... seems to imply that it isn't actually a spell. Just the same effect as the spell. 

Quote from Ravnodaus >>

Does "gain the effect of the Haste spell" mean the same thing as having haste cast on you as a spell?

The effect of the haste spell... seems to imply that it isn't actually a spell. Just the same effect as the spell. 

That's just the way potions handle spells.

Many items, such as potions, bypass the casting of a spell and confer the spell's effects, with their usual duration.

 

Yes, but the way they 'handle' spells is by recreating their effects without casting a spell.

If there was something that triggered on the casting of haste, or the casting of a spell, or whatever... drinking a Potion of Speed would not trigger that, because Haste has not been cast. The exhaustion section of Haste does say "when the spell ends," not "when the effect ends," so I see Rav's point that there is no spell ending to trigger the wave of exhaustion. Recreating the effect of Haste means recreating it entirely, not paraphrasing its terms to recontextualize them for a potion rather than a spell, that "when the spell ends" clause remains "when the spell ends."

RAI, this is definitely overthinking it, a Potion of Speed should probably just do everything that's in the spell block of Haste. But from a very narrowly RAW interpretation, I think that Rav is correct, there is no "spell" to end with a Potion of Speed.

However... now that I'm looking closer, that would also mean not getting any benefit out of it at all, since you only get the benefits "until the spell ends."

So... it either RAI is a Haste spell that you don't cast or concentrate on, good and bad alike, or its RAW a bottle of apple juice that does nothing :)

Quote from Chicken_Champ >>

Yes, but the way they 'handle' spells is by recreating their effects without casting a spell.

If there was something that triggered on the casting of haste, or the casting of a spell, or whatever... drinking a Potion of Speed would not trigger that, because Haste has not been cast. The exhaustion section of Haste does say "when the spell ends," not "when the effect ends," so I see Rav's point that there is no spell ending to trigger the wave of exhaustion. Recreating the effect of Haste means recreating it entirely, not paraphrasing its terms to recontextualize them for a potion rather than a spell, that "when the spell ends" clause remains "when the spell ends."

RAI, this is definitely overthinking it, a Potion of Speed should probably just do everything that's in the spell block of Haste. But from a very narrowly RAW interpretation, I think that Rav is correct, there is no "spell" to end with a Potion of Speed.

However... now that I'm looking closer, that would also mean not getting any benefit out of it at all, since you only get the benefits "until the spell ends."

So... it either RAI is a Haste spell that you don't cast or concentrate on, good and bad alike, or its RAW a bottle of apple juice that does nothing :)

I uh, actually think..lol.. that a strictly RAW reading gives you the full effects of the spell. So. ROFL... sorry this is hilarious.

Your... "speed is doubled, it gains a +2 bonus to AC, it has advantage on Dexterity saving throws, and it gains an additional action on each of its turns. That action can be used only to take the Attack (one weapon attack only), Dash, Disengage, Hide, or Use an Object action."

but also you get

"the target can't move or take actions"

For a full minute.

roflmao. The RAI is clearly not intended to cause that though obviously. RAI you should just run it like the spell was cast on the drinker.

When haste ends, you lose a turn. Is someone calling this into question?

No, but I think you missed the issue, which is whether ending the effect of Haste causes the same complications that ending the spell Haste cause.

Picture an Antimagic Field. AF does not end spells, but it does "suppress" the effect of those spells. You might consider that as the spell effect (temporarily) "ending" (or not, definitely debatable)... You might be under the influence of a Haste which has not ended, step into the AF field, and have the effect of your Haste ended despite the spell still being up.

Exhaustion? Even if you agree that "suppressed" means "ended" (temporarily), you might still say "not yet, because the spell hasn't ended, and that's what causes the lost turn!"

It's a short hop and skip from that towards the potion, which does not have a spell to end, only an effect.The ending of that effect doesn't cause fatigue, the ending of the spell does.

But all of this is pointless splitting hairs, because again... the positive effect of Haste also specifies "until the spell ends," so arguing this way at best gets you drinking a potion that provides you an effect that does nothing, since it looks for a spell which isn't existing. I very much agree with you that RAI, you drink the potion, you get a concentration-free Haste for 1 minute, and after that 1 minute, you get tired as normal. Just saying, the RAW is a little funny when you read the terms closely.

It's possible you may be overthinking this :)

Oh definitely :p

Quote from Chicken_Champ >>

It's a short hop and skip from that towards the potion, which does not have a spell to end, only an effect.The ending of that effect doesn't cause fatigue, the ending of the spell does.

 its only another short hop to the conclusion that "the target can't move or take actions" is an effect of the spell too. :)

Quote from Thundergun105 >>

I've heard it said that when a Potion of Speed's duration has expired, you don't suffer the negative effects of the Haste spell.

Is this true? From my understanding of the wording of Potion of Speed, I can't see why this would be the case as I would consider it part of the "effect" of the spell?

 Yes you gain the effect of the haste spell, which the lethargy is part of. As Jeremy Crawford once said;

@JeremyECrawford Potions are effectively bottled spells.