Meffnex 500mg/250mg Injection is a combination used in the treatment of heavy menstrual bleeding and menstrual pain. It prevents the breakdown of blood clots to control excessive bleeding during periods. It also blocks the production of certain chemical messengers that cause pain and inflammation. Meffnex 500mg/250mg Injection is given as an injection into vein under the supervision of a doctor. It should be taken on first day of the periods to get the most benefit. Keep taking it for as long as advised by your doctor. Take this medicine in the dose and duration advised by the doctor and if you have missed a dose, take it as soon as you remember. Remember to finish the full course of treatment even if you feel better. Inform your doctor if you do not observe any change in periods even after 3 consecutive periods. The most common side effects of this medicine include nausea, stomach pain, headache, nasal congestion, sinus pain, sinus inflammation, rash, tiredness and musculoskeletal (bone, muscle or joint) pain. It may also cause diarrhea, so its better to take plenty of fluids while taking this medicine as it may help to prevent dehydration. It is advised to consult with your doctor if you do not notice any changes in periods after 3 consecutive periods. Before taking it, let your doctor know if you have any kidney problems or vaginal bleeding disorder. Pregnant or breastfeeding women should also consult their doctor for advice before taking this medicine. You also need to tell your doctor what other medicines you are taking. You might be asked for eye check-up while taking this medicine. It is advised to avoid alcohol while taking this medicine.