Patients should not use Avanafil 100mg Tablet if sexual activity is inadvisable due to a history of heart disease.<br>ii. Patients on Avanafil 100mg Tablet taking medications for high blood pressure or alcohol in large amounts may experience a drop in blood pressure which can make them feel dizzy, faint, or have a heart attack or stroke.<br>iii. Patients should seek emergency treatment if an erection lasts for more than 4 hours.<br>iv. Patients should stop Avanafil 100mg Tablet and seek medical care if a sudden loss of vision occurs in one or both eyes, which could be a sign of non-arteritic ischemic optic neuropathy (NAION).