In some situations, garlic may be considered a poisonous plant - it can cause poisoning, including death to dogs and cats. It can also be dangerous to humans if consumed in excessive amounts. In extreme situations, it may damage the liver and kidneys. Some people are allergic to garlic, which may result in allergic contact dermatitis, anaphylactic shock, photodermatosis, or even skin burns. It may also affect the effectiveness of some medicines by making them more or less effective.
