Wolfsbane

Wolfsbane is an potent herb, and a werewolf's most well-known weakness. If a werewolf makes physical contact with vervain in any form, it will burn them. These affects extend to hybrids as well. Its flowers have been used in traditional potion-making. However, its leaves and flowers when consumed in large doses could be toxic to humans; though its effects on humans have never been shown and for the purposes of the show may be non-existent.

Species

Werewolves

Similar to how vamipres are affected by vervain, wolfsbane is shown to adversely affect werewolves. Ingesting wolfsbane severely weakens a werewolf and they appear feverish. Direct skin contact to wolfsbane causes them a burning sensation with fumes appearing from the contact area. It can be stated that wolfsbane to werewolves is exactly what vervain is to vampires.

During full moons, before transforming to the wolf form, some werewolves use wolfsbane to weaken themselves so that liabilities due to their wolf form can be avoided. They consume it in the form of a diluted extract of the essence of wolfsbane, so it isn't deadly.  Both Mason Lockwood and Tyler Lockwood have demonstrated usage of wolfsbane to subdue oneself.

Werewolves, despite their healing ability have long-lasting effects to wolvesbane if ingested. This is because it causes them to become ill. This is one way that's known for vampires to harm werewolves without killing them. In some cases it can even cause the said wolf to cough up blood making the herb almost deadly. It is also known that this particular herb will slow all injuries, sometimes even making it days before the wolf can heal again. It was also explained by Jules that more experienced werewolves can sniff out Wolfsbane

A werewolf's weakness to wolfsbane has not yet been explained in the show, although looking at the similarities at their specific weaknesses, this could be attributed to the creation of the first werewolves.

It was implied that a use of wolfsbane on werewolves can cause miscarriage.

Tyler touches Wolfbane

Tyler about to drink Wolfsbane

Damon force feeding Mason Wolfsbane

Jules sniffing out Wolfsbane

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Hybrids

It has been common knowledge among all that have dealt with werewolves that they are vulnerable to wolfsbane. As hybrids are a relatively new species with abilities of werewolves, it is natural that they had to have some weaknesses of werewolves in case they are identified as one.

So far, weaponised wolfsbane has only been shown to be used on hybrids. Katherine used wolfsbane grenades to slow down Klaus' sired hybrid army. Damon also used a wolfsbane grenade on the unsuccessful and rabid hybrid Ray Sutton, who also happened to play a game called " truth or wolfsbane" with Stefan

Katherine using wolfsbane Grenades

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Damon using Wolfsbane Grenade

" Truth or Wolfsbane"

Gallery

• Aconitum Vulparia
• Packet Wolfsbane
• Dried Wolfsbane

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Trivia

• Until now, every single wolfsbane administration has been done directly on the werewolf.
  • They've always been either consumed by werewolves, or forced on them. All other forms of contact too are purely external. Unlike vervain, wolfsbane is not consumed by humans to protect them from werewolf attacks
  • The fact that humans don't consume wolfsbane means one of two things. It is a toxic substance to consume even for humans. OR Werewolves are indeed so rare that they're potentially not a threat to humans, so they never considered consuming wolfsbane.
• Wolfsbane has no affect over untriggered werewolves. 
• Werewolves can smell Wolfsbane.

See also

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