Fildena is generally safe when used as directed under medical supervision. However, it may not be suitable for everyone, especially those with certain underlying health conditions or those taking medications that interact with sildenafil. It's crucial to consult a healthcare professional before starting Fildena 100. Fildena typically starts working within 30 minutes to an hour after ingestion, although individual response times may vary. It's recommended to take Fildena on an empty stomach for faster absorption and optimal effectiveness.