Filitra 20 mg contains vardenafil 20 mg, a PDE-5 inhibitor used for erectile dysfunction (ED). The people who should follow Filitra 20 mg dosage instructions most strictly are: Patients using it under a doctor’s prescription: A healthcare professional determines whether vardenafil is appropriate and what dose is suitable. Men with heart or blood pressure conditions: Incorrect use can increase risks, especially with cardiovascular problems. People taking other medicines: Those using blood pressure medicines, alpha-blockers, or other interacting drugs need careful guidance. Older adults or people with kidney/liver problems: The body may process medicines differently, making dose instructions more important. Anyone new to vardenafil: Following the prescribed dose helps assess effectiveness and side effects safely. General safety rules: Do not take more than the prescribed amount or take extra doses if the first dose does not work. Do not combine Filitra 20 mg with other ED medicines (such as sildenafil/Cenforce or tadalafil/Vidalista) unless a doctor advises it. Do not use it with nitrate medicines (such as nitroglycerin for chest pain), as this can cause a dangerous drop in blood pressure. Avoid heavy alcohol use, which can worsen dizziness and reduce erectile response.