Phallus Power 210 mg, which is an unbranded or less well-known formulation containing sildenafil (the same active ingredient found in Viagra), is used to treat erectile dysfunction (ED). Sildenafil generally remains effective for about 4 to 6 hours after ingestion. This means that you can achieve an erection in response to sexual stimulation during this period. In summary, the effective period of Phallus Power 210 mg is similar to other sildenafil formulations (4 to 6 hours), but the high dosage should be approached with caution and under medical supervision.