Considering
Introduced into Sharn by Daask, dragon's blood is a potent and highly addictive stimulant. In addition to inducing euphoria, it can enhance spellcasting ability or even temporarily imbue a user with the ability to cast sorcerer spells. The drug's effects are potentially dangerous and always unpredictable. This isn't something a player character should want to use; adventurers are more likely to interfere with Daask smugglers or deal with an addict who accidentally casts a fireball in a crowded street. - ERLW, page 244
could a blood drawn (donated?) from a person with a draconic ancestry (e.g. sorcerer) double as a source for the drug? I'm assuming dragon's blood here means literary blood of the dragon because it's not capitalized (hence can't be a name of the drug). But I could be wrong.