Men with erectile dysfunction may benefit from using Fildena 100 (sildenafil citrate) as a medicine if and when its use is approved. Every man experiences better sex and satisfies erections with this strategy. Men can get Fildena 100, often known as Generic Cialis, as a medication to treat erectile dysfunction. The effects of sildenafil start to manifest 30 to 60 minutes after the medication is taken, and they can last up to five hours. When males take Fildena 100 vs Viagra tablets for the first time, the effects normally wear off two to three hours later. There isn't a continuous dose course involved here. An hour after taking Viagra, erections usually last for 33 minutes.