Inferior absinthe is generally adulterated with copper, which produces the characteristic green color. The drug, absinthium, is rarely employed, but it might be of value in nervous diseases such as neurasthenia, as it stimulates the cerebral hemispheres, and is a direct stimulant of the cortex cerebri. When taken to excess it produces giddiness and attacks of epileptiform convulsions. Absinthium occurs in the British Pharmacopoeia in the form of extract, infusion and tincture, and is directed to be extracted also from A. maritima, the Sea Wormwood, which possesses the same virtues in a less degree, and is often more used as a stomachic than the Common Wormwood. Commercially this often goes under the name of Roman Wormwood, though that name really belongs to A. Pontica.
Wormwood is a very bitter plant with a long history of use as a medicinal herb.
It is valued especially for its tonic effect on the liver, gallbladder and digestive system, and for its vermicidal activity. It is an extremely useful medicine for those with weak and underactive digestion. It increases stomach acid and bile production, improving digestion and the absorption of nutrients. It also eases wind and bloating and, if taken regularly, helps the body return to full vitality after a prolonged illness. The leaves and flowering shoots are anthelmintic, anti-inflammatory, antiseptic, antispasmodic, antitumor, carminative, cholagogue, emmenagogue, febrifuge, hypnotic, stimulant, stomachic, tonic and vermifuge.