Fildena 120 mg is marketed as a sildenafil product for erectile dysfunction (ED). If you are taking sildenafil, staying adequately hydrated is generally sensible, but drinking and your usual needs. This is particularly important if you are exercising, sweating heavily, or experiencing vomiting or diarrhea. Avoid excessive alcohol because it can contribute to dehydration, excessive amounts of water will not make the medicine work better or last longer.