Filitra 20 mg contains vardenafil, a medicine used to treat erectile dysfunction. It can be used by older men, but 20 mg may not be the best starting dose, particularly for men aged 65 or older. I Imimg +1 For men 65+, prescribing information recommends considering a 5 mg starting dose, because vardenafil levels are higher in older adults. D DailyMed The usual starting dose for other adults is 10 mg, with 20 mg being the maximum recommended dose, taken no more than once daily. D DailyMed Do NOT take vardenafil with nitrate medicines such as nitroglycerin or isosorbide, because the combination can cause a dangerous drop in blood pressure. D DailyMed Extra caution is needed with alpha-blockers and blood-pressure medicines, as blood pressure can fall too much. D DailyMed Common side effects include headache, flushing, nasal congestion, indigestion, dizziness, and nausea. D DailyMed If you tell me the man's age, heart/BP conditions, and the medicines he currently takes, I can check whether Filitra/vardenafil is likely to be safe with them.