Magnesia Phosphorica 30C is a homeopathic medicine by Boiron which mainly indicates spasmodic pain in the abdomen improved by heat. This medicine uses highly diluted natural substances to relieve symptoms. This medicine comes in quick-dissolving pellet form. The multi dose is the common dosage for homeopathic remedies. The tube contains 80 pellets offering 3 to 5 pellets per dose, to be taken under the tongue at specified times.