Marsh cudweed is little used in modern herbalism, though it is occasionally taken for its astringent, antiseptic and anticatarrhal properties[254]. The whole plant is anti-inflammatory, astringent, diaphoretic and diuretic[4, 21, 165, 238]. It may also have aphrodisiac and anti-depressant effects[238]. It is used both internally and externally in the treatment of laryngitis, upper respiratory catarrh and tonsillitis, whilst in Russia it is used in the treatment of high blood pressure[238, 254]. The plant is harvested when it is in flower and is dried for later use[238].