Her physical dependence on the drug increases, leading to severe withdrawal effects when she tries to use less of the drug. (jax.org)
Cats do not seem to display any behaviors that suggest they miss the herb if it is not available and certainly do not seem to suffer any nasty withdrawal effects if they can't have it. (vetbabble.com)
Interestingly, similar receptors are responsible for the mood - altering and addictive effects of some antianxiety drugs, suggesting that the sudden progesterone drop after childbirth could be leaving some women with a kind of withdrawal effect. (sciencenews.org)