There are a few ways to make another vampire drink a potion in The Sims 4.

• Whisper the potion into the vampire’s ear. This is the most direct way to get the vampire to drink the potion. To do this, simply click on the vampire and select the “Whisper” interaction. Then, select the potion from your inventory and the vampire will drink it.
• Place the potion in the vampire’s inventory. This is a less direct way to get the vampire to drink the potion, but it can be effective if the vampire is already feeling thirsty. To do this, simply click on the potion and select the “Put in Inventory” interaction. Then, click on the vampire and select the “Drink” interaction.
• Force the vampire to drink the potion. This is the most forceful way to get the vampire to drink the potion, but it can also be the most dangerous. To do this, simply click on the vampire and select the “Force to Drink Potion” interaction. The vampire will then drink the potion, even if they don’t want to.

It is important to note that vampires can only drink potions that are compatible with their vampiric state. For example, a vampire cannot drink a potion of youth if they are already a young adult. Additionally, vampires can only drink potions that are within their skill level. For example, a vampire who is not skilled in Alchemy will not be able to drink a potion that is created using complex ingredients.

Finally, it is important to remember that vampires can refuse to drink a potion, even if it is compatible with their vampiric state and they are skilled enough to drink it. If a vampire refuses to drink a potion, you will not be able to force them to do so.