The salt for cramps and pains. Magnesium phosphoricum is helpful in the treatment of frequent cramps and spasms of muscles. It is indicated in case of muscle pains, common tensions in the neck or shoulders and painful spasms in the gastrointestinal tract, painful menses and flatulence, toothache, joint pains, sciatica, intestinal colic, headache, neuralgia or for any other indication, as recommended by your physician.