Which herb contains pyrrolizidine alkaloids and is used as an Expectorant, Demulcent, and Antitussive, with contraindications including pregnancy and liver disease?

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Coltsfoot fits the description because it contains pyrrolizidine alkaloids, compounds known to be hepatotoxic, which is why it carries contraindications in pregnancy and liver disease. Despite that safety warning, Coltsfoot has been used traditionally as an expectorant, a demulcent (soothing mucous membranes), and an antitussive, thanks to its mucilage that coats irritated throat tissues and helps loosen mucus. The other herbs listed don’t contain pyrrolizidine alkaloids and thus don’t carry that same liver-toxicity warning; Linden and Slippery Elm can help with coughs or soothe irritated mucosa but lack the PA-associated liver risk, and Bilberry is more of an astringent than an expectorant or antitussive. So the herb that matches all parts of the prompt—the PA content, the three respiratory uses, and the specific contraindications—is Coltsfoot.