Malegra Professional is often avoided or used with caution in certain heart conditions because it contains sildenafil citrate, which affects blood vessel relaxation and blood pressure. Why it may be risky in some heart conditions Blood pressure lowering: Sildenafil can cause a drop in blood pressure. In people with unstable heart disease, severe low blood pressure, or certain cardiovascular problems, this effect may increase risks such as dizziness, fainting, or reduced blood flow to vital organs. Interaction with nitrate medicines: Many heart patients use nitrate medicines (such as nitroglycerin) for chest pain. Combining nitrates with sildenafil can cause a dangerous sudden drop in blood pressure. Heart workload during ***** activity: ***** activity itself increases heart demand. Men with recent heart attacks, unstable angina, severe heart failure, or uncontrolled blood pressure may need medical evaluation before using ED medicines. Other cardiovascular factors: Doctors may consider blood pressure control, heart rhythm problems, and other medications before recommending sildenafil.