Felex 100mg Capsule is a pain relieving medicine. It is used to treat acute and chronic pain associated with various conditions such as muscle pain, headache, nerve pain, postoperative pain, and menstrual cramps. It is not recommended for use in patients less than 18 years of age. Felex 100mg Capsule can be taken with or without food. In general, you should try to use the smallest amount necessary to control your symptoms, for the shortest possible time. You should take this medicine regularly while you need it. Try not to miss doses as this will make the medicine less effective. Some of the common side effects of this medicine include fatigue, dizziness, drowsiness, nausea, dryness in mouth, and abdominal bloating. If any of these side effects do not go away or get worse, you should let your doctor know. Your doctor may be able to suggest ways of preventing or reducing the symptoms. To make sure it is safe for you, before taking this medicine, let your doctor know if you have any medical conditions or disorders. You should also tell your doctor all the other medicines you are using or taking. Pregnant and breastfeeding women should consult their doctors before using this medicine.