Mefenil Suspension. Paracetamol 125 mg + Mefenamic acid 50 mg Suspension Mefenamic acid 50mg It is a low efficacy drug, has both peripheral and central analgesic action. Its most important and adverse effects are diarrhoea & Haemolytic. Indications Painful musculoskeletal conditions including low back pain, rheumatoid and osteoarthritis