Muscle Relaxant Mag Phos is the anti-spasmodic tissue salt. It is the remedy that may relieve muscle cramps and aches and compliments the action of Kali Phos. Mag Phos may be quick to relieve pain, especially cramping, shooting, darting or spasmodic pain. It may relieve muscular twitching, cramps, hiccups, convulsive fits of coughing and those sudden, sharp twinges of pain that are so distressing.