If i have erectile dysfunction, is it ok if i take 100mg sildenafil before intercourse knowing that i do sexual act once daily&i succeed at 100mg pde-5?

Should be OK: Provided it does not interfere with your blood pressure/heart medications. Both calcium channel blockers ; benecar are blood vessel dilators, so if anything would also help to achieve erection rather than be responsible for ed. Thi should be discussed with your nephrologist/blood pressure dr. There are certainly meds that can be responsible for ed, but yours fortunately are not.

May be: Need evaluation to ensure that the erectile dysfunction is not an adverse effect of medications, also psychological issues associated with erectile dysfunction as well fitness. If no treatable cause is identified and you have no CAD it may okay.