Rapisone-SR Capsule is used to treat muscle spasms. It contains Eperisone which works by relaxing skeletal muscles. In some cases, this medicine may cause side effects such as nausea, vomiting, stomach discomfort, headache, weakness, drowsiness and dizziness. Inform the doctor if you are pregnant or breastfeeding, taking any other medication, or have any pre-existing medical conditions.