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The edema due to renflexis is an uncommon side effect. If you have leg edema, then it is advisable to investigate as follow.
1. Serum protein estimation to rule out hypoproteinemia.
2. Sgpt (serum glutamate-pyruvate transaminase) to exclude liver disease.
3. Urea, creatinine estimation to rule out kidney disease.
4. Serum TSH estimation to rule out hypothyroidism.
Echocardiography to exclude cardiac cause and finally local ankle joint X-ray if needed. If edema leg more than diuretic like Furosemide can be prescribed after consultation with your doctor. I suggest you consult nearby physician for a detailed discussion of all these. I hope I have answered your question.