Trimazosin Other Interactions Certain medicines should not be used at or around the time of eating food or eating certain types of food since interactions may occur. Sildenafil at steady state, at a dose not approved for the treatment of erectile dysfunction 80 mg t. In vivo studies: No significant interactions were shown with tolbutamide mg or warfarin 40 mg , both of which are metabolized by CYP2C9. Key facts It usually takes 30 to 60 minutes for sildenafil to work for erectile dysfunction. Dosing The dose of this medicine will be different for different patients.1 day ago · Roman is a healthcare technology company that sells FDA-approved men’s health products.. The first step is scheduling a $15 consultation with one of their licensed healthcare professionals to. According to price-comparison site test1.ru, generic Revatio will cost you as little as $ per pill, depending on where you fill your prescription. That’s compared with more than $50 per. Maximum dose: 20 mg orally three times a day. Injection: Initial dose: or 10 mg IV bolus three times a day. Comments: No greater efficacy was achieved with oral doses higher .