Before you start taking Yaz Plus, inform your doctor:, About any medications you are currently taking, especially those that may affect the effectiveness of Yaz Plus like certain HIV medications, certain seizure medications, or the herb St John's Wort., About any medical conditions you have, including high blood pressure, diabetes, high cholesterol, or obesity., If you smoke and are over 35 years old., If you have a history of blood clots or strokes., If you are pregnant or planning to become pregnant. Yaz Plus can cause harm to your unborn baby., If you are breastfeeding or plan to breastfeed. Yaz Plus may reduce the quantity and alter the composition of breast milk., Be aware that Yaz Plus doesn't protect against sexually transmitted diseases, including HIV/AIDS., Yaz Plus can cause hyperkalemia, a condition characterized by high potassium levels. Check with your doctor if you are on other medications that can increase potassium levels., Yaz Plus can cause blood clots, which can lead to serious conditions like deep vein thrombosis, pulmonary embolism, stroke, or heart attack. Contact your doctor immediately if you experience sudden blindness, chest pain, difficulty breathing, unusual headache, or weakness or numbness in your arms or legs. About any medications you are currently taking, especially those that may affect the effectiveness of Yaz Plus like certain HIV medications, certain seizure medications, or the herb St John's Wort., About any medical conditions you have, including high blood pressure, diabetes, high cholesterol, or obesity., If you smoke and are over 35 years old., If you have a history of blood clots or strokes., If you are pregnant or planning to become pregnant. Yaz Plus can cause harm to your unborn baby., If you are breastfeeding or plan to breastfeed. Yaz Plus may reduce the quantity and alter the composition of breast milk.