Prazolix 5mg Tablet SR is used to treat high blood pressure and lower your risk of having a heart attack or stroke. It may also be used to treat heart failure and mild enlargement of the prostate gland. Prazolix 5mg Tablet SR may be prescribed alone or in combination with other medicines. It can be taken with or without food. The dose will depend on your condition and how you respond to the medicine. Take this medicine regularly to get the most benefit. High blood pressure does not usually have symptoms so keep taking it even if you feel well. If you stop, your blood pressure may rise and put you at risk of heart attack or stroke. You may need to take it for the rest of your life. The most common side effects of this medicine include dizziness, headache, nausea, and unusual beating of the heart (palpitation). Most side effects disappear when you get used to the medicine. It may also cause your blood pressure to go too low especially when you first start taking this medicine. Your doctor may be able to help with ways of preventing or reducing these side effects. If you are pregnant, thinking about becoming pregnant, or breastfeeding, ask your doctor before using this medicine. Also, inform your doctor if you have a history of heart failure, liver disease, or kidney disease and if you are having eye surgery for a cataract. Your blood pressure will need to be checked regularly while using this medicine.