The homeopathic remedy Magnesia Phosphorica is for cramps, neuritis/neuralgia, painful menses, colic, dry cough. Magnesia Phosphoricum is used for muscle cramps, back problems as well as many other conditions. Modalities:: WORSE cold; air; night; touch. BETTER pressure; warmth, heat; bending double; hot bathing. SOURCE: Boericke Materia Medica
You can find Magnesia Phosphorica Pills at Remedy Source.