Fildena Chewable 100 mg you mean the sildenafil-containing erectile-dysfunction medicine, its environmental impact is mainly related to sildenafil residues entering wastewater after use or improper disposal. Wastewater contamination: Sildenafil can pass into sewage, and studies have detected PDE-5 inhibitors in wastewater and receiving waters. One study found wastewater-treatment removal of these compounds was less than 10% at the facilities examined. P PubMed Central (PMC) +1 Aquatic effects: Laboratory research suggests sildenafil can affect aquatic organisms, particularly with prolonged exposure. P PubMed Transformation products: Sunlight and wastewater chlorination can transform sildenafil into other chemicals; some transformation products may persist and potentially have greater environmental effects. P PubMed +1 Disposal matters: Don't flush unused tablets down the toilet or sink. Pharmaceutical residues are a recognized environmental concern, with household wastewater and wastewater-treatment effluent being major pathways. O OECD For one 100-mg tablet, the individual environmental impact is likely very small, but widespread use can contribute to pharmaceutical pollution. If you're asking because you are considering taking Fildena Chewable 100 mg, I can also explain its safety, side effects, and how it compares with Penegra 50 mg/Malegra 25 mg.