Filitra (which contains vardenafil, used for erectile dysfunction) can interact with certain medicines, so caution is needed. Here’s a detailed breakdown: Medicines to be careful with or avoid Nitrates (for chest pain/angina, e.g., nitroglycerin, isosorbide mononitrate) Combining with Filitra can cause dangerous drops in blood pressure. Never take together. Alpha-blockers (for high blood pressure or prostate issues, e.g., tamsulosin, doxazosin) Can cause low blood pressure or dizziness, especially when starting or increasing dose. Other erectile dysfunction drugs Taking multiple PDE5 inhibitors together is not recommended. Certain antibiotics and antifungals (e.g., erythromycin, ketoconazole, itraconazole) Can increase Filitra levels in the blood, increasing risk of side effects like headache, flushing, or low blood pressure. HIV or hepatitis C medications (protease inhibitors like ritonavir, indinavir) May increase vardenafil levels, increasing side effect risk. Other medicines affecting heart rhythm Some antiarrhythmic drugs (e.g., amiodarone) may interact; caution is advised. General precautions Alcohol: Moderate use is usually okay, but excess can increase dizziness or blood pressure drop. Liver or kidney problems: Dose adjustment may be needed. Always tell your doctor or pharmacist about all prescription, OTC, and herbal medicines you take before using Filitra.