** 1. Microgynon and Rigevidon have the same ingredients in same dosage and because it is cheaper for health suppliers to give out Rigevidon therefore most Doctors prefer giving it, although they contain exactly the same drugs, other constituents may be different. 2. You could experience side effects, since drug made by different manufacturer might have slight difference/change. and because its a hormonal preparation, few hormonal contraceptives are known to aggravate depression, and cause side effects like nausea, headache, bloating, weight gain, vaginal discharge etc. PS. Consider visiting your doctor/gynecologist for further evaluation and assistance to see if switching to ALTERNATE low dosage hormonal contraceptive would help. You may also consider taking second opinion from another gynecologist.