Thioquest 4mg Injection is a muscle relaxer. It provides relief from the discomfort associated with acute, painful musculoskeletal conditions such as rigidity, tension, stiffness, and muscle spasms. Thioquest 4mg Injection is generally administered by a healthcare professional. You should not self-administer this medicine at home. The dose and duration will depend on what you are taking it for and how well it helps your symptoms. You should continue using the medicine until the doctor tells you it is alright to stop. The most common side effects of this medicine include injection site reactions (such as pain, redness, and swelling), sleepiness, diarrhea, and abdominal pain. If any of these side effects persist or get worse, you should let your doctor know. Your doctor may be able to suggest ways of preventing or reducing the symptoms. Before using it, you should let your doctor know if you have problems with your heart, liver, or kidneys. Let your doctor also know about all the other medicines you are taking because they may affect, or be affected by, this medicine. If you are pregnant or breastfeeding, it is important to ask the advice of your doctor before taking this medicine.