Sildisoft Tablets (commonly containing sildenafil citrate) should not be mixed with nitrate medicines because the combination can cause a dangerous drop in blood pressure. Why the interaction is risky Sildenafil works by increasing the effects of nitric oxide, which relaxes blood vessels and improves blood flow to the *****. Nitrates (such as nitroglycerin or isosorbide medicines used for chest pain) also widen blood vessels through nitric oxide pathways. When taken together, their blood-pressure-lowering effects can become much stronger, potentially causing severe hypotension (very low blood pressure). Possible symptoms of a dangerous blood pressure drop Severe dizziness Fainting Weakness Blurred vision Chest discomfort Loss of consciousness in serious cases Examples of nitrate medicines that can interact Nitroglycerin (GTN) Isosorbide mononitrate Isosorbide dinitrate Some recreational “poppers” containing nitrate compounds What to do before taking Sildisoft Tell your healthcare provider if you: Take heart medicines Have chest pain (angina) Have low blood pressure Have a history of heart problems Seek urgent medical help if you experience chest pain, fainting, severe dizziness, or other signs of a serious reaction after taking sildenafil. Always check with a healthcare professional before combining ED medicines with heart or blood pressure treatments.