Drospirenone increase potassium levels in your blood. You should not take Slynd if you have kidney, liver or adrenal disease because this could cause serious heart problems as well as other health problems. Other medicines may also increase potassium levels in your blood. If you are currently on daily, long-term treatment for a chronic health condition with any of the medicines listed below, talk to your healthcare provider about whether Slynd is right for you. If you take any of the medicines listed below for a chronic health condition you should have a blood test to check the potassium level in your blood before you start taking this medicine and during the first month that you take Slynd: medicines to treat fungal infections, such as ketoconazole, itraconazole, or voriconazole, medicines to treat Human Immunodeficiency Virus (HIV) infection or Hepatitis C infection, such as indinavir or boceprevir, clarithromycin.