Filitra 20 mg contains Vardenafil, which is a PDE5 inhibitor similar to Sildenafil (Viagra) and Tadalafil (Cialis). It is used to treat erectile dysfunction (ED) by increasing blood flow to the penis. The reason Filitra 20 mg (Vardenafil) interacts with nitrates (such as nitroglycerin, used for angina or chest pain) is due to how both medications affect blood pressure: Mechanism of Interaction PDE5 inhibitors (like Vardenafil) work by blocking the PDE5 enzyme, which increases the levels of cGMP (cyclic guanosine monophosphate). This relaxes Filitra 20 mg muscle tissue and dilates blood vessels, leading to an increase in blood flow to the penis during ****** stimulation. Nitrates, on the other hand, work by releasing nitric oxide (NO) in the body. Nitric oxide relaxes blood vessels, reducing blood pressure and increasing blood flow to the heart and other tissues. Nitrates are typically used for people with heart conditions like angina (chest pain), to relax and dilate the coronary arteries. Both of these medications lower blood pressure by different mechanisms, but when combined, the effects are additive. The combined use of Vardenafil (Filitra) and nitrates can result in a severe and potentially dangerous drop in blood pressure. Why This Is Dangerous When you take Filitra (Vardenafil) and nitrates together, the combined vasodilation (widening of blood vessels) can cause a significant drop in blood pressure (hypotension), leading to symptoms like: Dizziness Fainting Heart palpitations Nausea Even heart attack or stroke in extreme cases This drop in blood pressure can be particularly dangerous, especially in individuals with pre-existing heart conditions or those taking other medications that affect blood pressure.