Cenforce 150>>Blissful Love>>Gurented Relief From ED | Cenforce 150 (Sildenafil), a red pill for erectile dysfunction (ED), lasts approximately four hours. The sildenafil concentrations reach their peak in approximately an hour. Therefore, it is best to take sildenafil between 30 and 60 minutes before you have sex. Although sildenafil can be taken up to four hours before sex, its effects will diminish after just two hours.