Potion, uncommon
The next time you see a creature within 10 minutes after drinking this philter, you become charmed by that creature for 1 hour. If the creature is of a species and gender you are normally attracted to, you regard it as your true love while you are charmed. This potion's rose-hued, effervescent liquid contains one easy-to-miss bubble shaped like a heart.
Notes: Charmed, Control, Consumable
There is nothing in the rules that suggests to me the Philter of Love’s effects should end if the charmer does something that the charmed person would ordinarily find objectionable or even harmful.
“Charmed” is a condition much like “frightened” or “poisoned”, so has set effects on a creature. Each spell or item that can cause the charmed condition has its own rules about how to counter it independent of how other spells or items behave. Charm Person is only a first level spell so it has a lot of limitations.
Obviously any DM may rule that the Philter of Love is not powerful enough to keep someone charmed if the charmer does them harm, but that’s not RAW. If it’s powerful enough to make someone fall in love (for an hour, anyway), it seems inconsistent to make it so easily countered.
Nothing in the rules to say the person would know they were charmed if they weren’t aware they took the potion. But you could make it interesting by letting the character roll a Wisdom check when the potion wears off. It’s very plausible that a shrewd character would notice how suspicious it is that they suddenly had a lot of affection for someone and those feelings evaporated after only an hour.
Says 1 hour
I love that there isn't even a saving throw