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Materia Medica Viva Volume 3 – page 679

ASTACUS FLUVIATILIS
Cancer fluviatilis. Crawfish or River Crab. N.O. Crustacaea.
Tincture from the whole animal.
THE ESSENTIAL FEATURES
This remedy produces a condition of the skin similar to the one produced by Rhus-tox poisoning. The whole body can be covered by red raised spots, fiery red, nettlerash, with intolerable itching.
This remedy can produce an eruption of such dimensions that it can cover almost the whole body; indeed, when you see such a case, what impresses you most is the extent and the redness of the eruption. If, moreover, the liver should be involved in any way, the case for Astacus will be all the stronger.
Astacus will be useful in such allergic conditions as urticaria, of the type consisting of small raised spots, like nettlerash, and erysipelas with nettlerash. It will be confused with Belladona because of the redness of its eruptions and also because it has violent fever, with headache and a red glowing face. It will also, as mentioned, look like/?h us-fox:. because of the eruptions, but also due to the inner chilliness felt by the patient. Inward chilliness, and sensitiveness to air; worse from uncovering. It is much like Hepar-s., in this respect. Sensitive to any draft of air, in spite of having a lot of heat in the room.
This remedy is essentially composed of a combination of symptoms from Rhus-tox. and Belladona. If you remember the redness and glowing face of Belladona and the inward coldness of Rhus-tox, and if you find them together in the same case, then you can prescribe Astacus.
Generalities and keynotes
Enlarged glands of neck in children and old people. It affects the liver and lymphatic glands. Cramps in liver region, liver inflamed: worse from pressure. Pain and tenderness of liver, jaundice, stools of pipe-clay colour. Jaundice of children.