Below are the main rubriks (i.e strongest indications or symptoms) of Natrum Phosphoricum in traditional homeopathic usage, not approved by the FDA.
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Cough, after drinking water,
Cough, from tickling in throat,
Irritation in throat; dry, tickling cough (one hundred and sixth day),
Constant cough, and hawking pain in chest, in the mammary regions (one hundred and sixth day),≡ more ...