Filitra 20 mg contains Sildenafil, another PDE5 inhibitor like Tadalafil (Tadalista), used to treat erectile dysfunction (ED). Since 20 mg is a relatively low dose (common doses are 25–100 mg), precautions are still important. Here’s a thorough breakdown: 1. Medical Conditions to Check Before taking Filitra 20 mg, consult a doctor if you have: Heart problems: Angina, arrhythmias, heart attack, or stroke in the last 6 months. Low blood pressure or uncontrolled high blood pressure. Liver or kidney disease. Retinal disorders: e.g., retinitis pigmentosa. Deformities of the penis or conditions predisposing to priapism (e.g., sickle cell anemia, leukemia). 2. Drug Interactions Do not take Filitra 20 mg with: Nitrates (e.g., nitroglycerin, isosorbide) – can cause dangerous drop in Filitra 20 mg  pressure. Alpha-blockers (for prostate or high blood pressure) – may cause dizziness or fainting. Certain antifungals or antibiotics that affect liver enzymes. 3. Lifestyle Precautions Avoid excessive alcohol – can reduce effectiveness and increase side effects. Do not use recreational drugs with nitrates. Take on an empty stomach for faster onset; high-fat meals may delay effect. 4. How to Take Safely Take about 30–60 minutes before sexual activity. Do not exceed one dose per 24 hours. Start with the lowest effective dose; your doctor may adjust it. 5. Watch for Warning Signs Seek immediate medical attention if: Erection lasts more than 4 hours (priapism). Sudden vision or hearing loss. Severe dizziness or chest pain during sex.