Picricum Acidum is a homeopathic remedy for weakness, skin affections, headache. Picric Acid is used for brain fag, weakness and pain in the back, prostration, muscular debility, writer's palsy. Symptoms include pins and needle sensation in extremities, tiredness, heavy feeling. Modalities:: WORSE least exertion, especially mental; after sleep; wet weather; summer. BETTER cold air, cold water; tight pressure. SOURCE: Boericke Materia Medica
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