Hi I Want To Know About Folitrax 10mg Tab For

hi i want to know about folitrax 10mg tab for joint pains to my mom,she is 55 years old.and she was suffering from joint pains since 15 years..many doctors have prescribed this tab...whenever she take this tab she suffered side effects like nausea, vomting, headache..by suffering this side effects..in between she used to discontinue the tablets..whenever the pain is more again she used to start.."i want to know wether she is doing right or wrong..by not following the doctor's course"?