Fildena 100 mg should not be taken by individuals who are allergic to sildenafil citrate or any of the other ingredients in the medication. It's also important to use Fildena 100 mg with caution if you have certain medical conditions, such as heart disease, liver or kidney problems, or low blood pressure.Fildena 100 mg usually starts working within 30 minutes to 1 hour after ingestion and can remain effective for up to 4 to 6 hours. https://www.onemedz.com/product/fildena-100-mg/