The flower-heads of Arnica montana.

Characters. - About one and one-fifth inch (30 centimetres) broad, depressed-roundish, consisting of a scaly involucre in two rows, and a small, flat, hairy receptacle, bearing about sixteen yellow, strap-shaped ray-florets; and numerous yellow, five-toothed, tubular disk-florets having slender, spindle-shaped achenes, crowned by a hairy pappus. It has a feeble, aromatic odour, and a bitter, acrid taste.

Preparation.

u.s.p.

Dose.

Tinctura Arnicae Florum...........................................................

1/2-2 fl. dr.

Action. - Arnica, externally, has a stimulant effect on the skin, and if evaporation be prevented it will produce redness and sometimes an erysipelatous inflammation, spreading some distance.

Internally it gives rise to a feeling of warmth in the mouth, stomach, and intestines, also increasing their peristaltic movements. In large doses it produces partial insensibility, convulsions, and sometimes syncope.

Uses. - It is very generally used in bruises and sprains, but it has been shown by Dr. Garrod to be no more serviceable than spirit of the same strength, and it has the disadvantage of sometimes producing erysipelatous inflammation. It has been used internally in dysentery, chronic bronchitis, rheumatism, nervous diseases, and malarious conditions. Its value is doubtful.