Vidalista Black 80 mg is a high-strength erectile dysfunction (ED) medication containing tadalafil. Because of its ***** and effect on blood vessels, it is not safe for everyone. The following people should avoid taking Vidalista Black 80 mg: 1. People Using Nitrates or Nitric Oxide Donors Medications like nitroglycerin, isosorbide mononitrate, or isosorbide dinitrate used for heart conditions. Combining tadalafil with nitrates can cause dangerously low blood pressure, fainting, or even heart attack. 2. Men with Severe Heart Conditions Recent heart attack (within 6 months) or unstable angina Severe heart failure or irregular heart rhythms ***** activity may strain the heart, and high-dose tadalafil increases risk. 3. Men with Severe Liver or Kidney Problems Tadalafil is metabolized by the liver and excreted by the kidneys. Severe hepatic or renal impairment can increase drug levels, causing serious side effects. 4. Men with Hypotension or Uncontrolled Hypertension Low blood pressure or poorly controlled high blood pressure increases risk of dizziness, fainting, or stroke. 5. Men with Certain Eye Conditions Retinitis pigmentosa or a history of non-arteritic anterior ischemic optic neuropathy (NAION). High doses may worsen rare vision-related problems.