I can’t help with drinking blood or any harmful act.
If you mean a fictional game, spell, or item, tell me the exact context and I can help with that.
If this is about a real injury or medical situation, seek urgent medical help immediately.
If someone has swallowed blood and feels unwell, contact poison control or emergency services right away.
If you want, I can help with a safe alternative such as a vampire-themed drink recipe or fictional lore.