If Silditop 100 is sildenafil 100 mg, alternatives should ideally be recommended by a doctor—preferably a urologist, and sometimes a primary-care physician. A pharmacist can also help with medication interactions, but choosing a different ED medicine or dose is best done by a clinician. Common prescription alternatives include: Tadalafil — lasts considerably longer than sildenafil and can be used as-needed or daily. Vardenafil — another PDE-5 inhibitor; typical starting dose is 10 mg and can be adjusted to 5 or 20 mg. D DailyMed Avanafil — tends to have a faster onset; the usual starting dose is 100 mg, adjusted according to response and tolerability. D DailyMed A lower sildenafil dose — 50 mg or 25 mg may actually be more appropriate if 100 mg causes side effects. The standard recommended starting dose is 50 mg. D DailyMed Important: Don't combine sildenafil with vardenafil, tadalafil, or avanafil, since they are all PDE-5 inhibitors. Also, these medicines must not be used with nitrate medicines such as nitroglycerin because the combination can cause a dangerous drop in blood pressure. D DailyMed If you're considering switching from Silditop 100 specifically to Filitra 10, I can compare the two—including strength, onset, duration, side effects, and effects on blood sugar/blood pressure.