Thionoxide 4mg Capsule is a muscle relaxer used to relieve discomfort from musculoskeletal conditions. It is best taken with food to avoid stomach upset and reduce side effects. Common side effects include sleepiness, diarrhea, and abdominal pain. Before using this medication, inform your doctor about any medical conditions or disorders, and inform them of all other medications. Pregnant and breastfeeding women should consult their doctors.