Thanacetin is a bioactive compound found in plants such as yarrow (Achillea millefolium) and tansy (Tanacetum vulgare). It belongs to the class of flavonoids and has a wide range of medicinal properties, including anti-inflammatory, antimicrobial and antispasmodic effects. In traditional medicine, thanacetin is used to treat a variety of ailments, such as inflammation, digestive disorders, and headaches.

Thanacetin helps reduce inflammation and pain, so it is often used in the form of tinctures, decoctions and ointments to treat arthritis, rheumatism and skin diseases. Due to its antispasmodic properties, it is effective in the treatment of menstrual cramps and stomach cramps. Thanacetin also has antimicrobial effects, making it useful for treating infections. However, it is recommended to consult a doctor before using preparations containing tanacetin, as improper use can lead to side effects.